Provides a set of static (Shared in Visual Basic) methods for querying objects that implement T:System.Collections.Generic.IEnumerable`1. More...

Static Public Member Functions
static IEnumerable< TSource >	Where< TSource > (this IEnumerable< TSource > source, Func< TSource, bool > predicate)
	Filters a sequence of values based on a predicate. More...

static IEnumerable< TSource >	Where< TSource > (this IEnumerable< TSource > source, Func< TSource, int, bool > predicate)
	Filters a sequence of values based on a predicate. Each element's index is used in the logic of the predicate function. More...

static IEnumerable< TResult >	Select< TSource, TResult > (this IEnumerable< TSource > source, Func< TSource, TResult > selector)
	Projects each element of a sequence into a new form. More...

static IEnumerable< TResult >	Select< TSource, TResult > (this IEnumerable< TSource > source, Func< TSource, int, TResult > selector)
	Projects each element of a sequence into a new form by incorporating the element's index. More...

static IEnumerable< TResult >	SelectMany< TSource, TResult > (this IEnumerable< TSource > source, Func< TSource, IEnumerable< TResult >> selector)
	Projects each element of a sequence to an T:System.Collections.Generic.IEnumerable`1 and flattens the resulting sequences into one sequence. More...

static IEnumerable< TResult >	SelectMany< TSource, TResult > (this IEnumerable< TSource > source, Func< TSource, int, IEnumerable< TResult >> selector)
	Projects each element of a sequence to an T:System.Collections.Generic.IEnumerable`1, and flattens the resulting sequences into one sequence. The index of each source element is used in the projected form of that element. More...

static IEnumerable< TResult >	SelectMany< TSource, TCollection, TResult > (this IEnumerable< TSource > source, Func< TSource, int, IEnumerable< TCollection >> collectionSelector, Func< TSource, TCollection, TResult > resultSelector)
	Projects each element of a sequence to an T:System.Collections.Generic.IEnumerable`1, flattens the resulting sequences into one sequence, and invokes a result selector function on each element therein. The index of each source element is used in the intermediate projected form of that element. More...

static IEnumerable< TResult >	SelectMany< TSource, TCollection, TResult > (this IEnumerable< TSource > source, Func< TSource, IEnumerable< TCollection >> collectionSelector, Func< TSource, TCollection, TResult > resultSelector)
	Projects each element of a sequence to an T:System.Collections.Generic.IEnumerable`1, flattens the resulting sequences into one sequence, and invokes a result selector function on each element therein. More...

static IEnumerable< TSource >	Take< TSource > (this IEnumerable< TSource > source, int count)
	Returns a specified number of contiguous elements from the start of a sequence. More...

static IEnumerable< TSource >	TakeWhile< TSource > (this IEnumerable< TSource > source, Func< TSource, bool > predicate)
	Returns elements from a sequence as long as a specified condition is true. More...

static IEnumerable< TSource >	TakeWhile< TSource > (this IEnumerable< TSource > source, Func< TSource, int, bool > predicate)
	Returns elements from a sequence as long as a specified condition is true. The element's index is used in the logic of the predicate function. More...

static IEnumerable< TSource >	Skip< TSource > (this IEnumerable< TSource > source, int count)
	Bypasses a specified number of elements in a sequence and then returns the remaining elements. More...

static IEnumerable< TSource >	SkipWhile< TSource > (this IEnumerable< TSource > source, Func< TSource, bool > predicate)
	Bypasses elements in a sequence as long as a specified condition is true and then returns the remaining elements. More...

static IEnumerable< TSource >	SkipWhile< TSource > (this IEnumerable< TSource > source, Func< TSource, int, bool > predicate)
	Bypasses elements in a sequence as long as a specified condition is true and then returns the remaining elements. The element's index is used in the logic of the predicate function. More...

static IEnumerable< TResult >	Join< TOuter, TInner, TKey, TResult > (this IEnumerable< TOuter > outer, IEnumerable< TInner > inner, Func< TOuter, TKey > outerKeySelector, Func< TInner, TKey > innerKeySelector, Func< TOuter, TInner, TResult > resultSelector)
	Correlates the elements of two sequences based on matching keys. The default equality comparer is used to compare keys. More...

static IEnumerable< TResult >	Join< TOuter, TInner, TKey, TResult > (this IEnumerable< TOuter > outer, IEnumerable< TInner > inner, Func< TOuter, TKey > outerKeySelector, Func< TInner, TKey > innerKeySelector, Func< TOuter, TInner, TResult > resultSelector, IEqualityComparer< TKey > comparer)
	Correlates the elements of two sequences based on matching keys. A specified T:System.Collections.Generic.IEqualityComparer`1 is used to compare keys. More...

static IEnumerable< TResult >	GroupJoin< TOuter, TInner, TKey, TResult > (this IEnumerable< TOuter > outer, IEnumerable< TInner > inner, Func< TOuter, TKey > outerKeySelector, Func< TInner, TKey > innerKeySelector, Func< TOuter, IEnumerable< TInner >, TResult > resultSelector)
	Correlates the elements of two sequences based on equality of keys and groups the results. The default equality comparer is used to compare keys. More...

static IEnumerable< TResult >	GroupJoin< TOuter, TInner, TKey, TResult > (this IEnumerable< TOuter > outer, IEnumerable< TInner > inner, Func< TOuter, TKey > outerKeySelector, Func< TInner, TKey > innerKeySelector, Func< TOuter, IEnumerable< TInner >, TResult > resultSelector, IEqualityComparer< TKey > comparer)
	Correlates the elements of two sequences based on key equality and groups the results. A specified T:System.Collections.Generic.IEqualityComparer`1 is used to compare keys. More...

static IOrderedEnumerable< TSource >	OrderBy< TSource, TKey > (this IEnumerable< TSource > source, Func< TSource, TKey > keySelector)
	Sorts the elements of a sequence in ascending order according to a key. More...

static IOrderedEnumerable< TSource >	OrderBy< TSource, TKey > (this IEnumerable< TSource > source, Func< TSource, TKey > keySelector, IComparer< TKey > comparer)
	Sorts the elements of a sequence in ascending order by using a specified comparer. More...

static IOrderedEnumerable< TSource >	OrderByDescending< TSource, TKey > (this IEnumerable< TSource > source, Func< TSource, TKey > keySelector)
	Sorts the elements of a sequence in descending order according to a key. More...

static IOrderedEnumerable< TSource >	OrderByDescending< TSource, TKey > (this IEnumerable< TSource > source, Func< TSource, TKey > keySelector, IComparer< TKey > comparer)
	Sorts the elements of a sequence in descending order by using a specified comparer. More...

static IOrderedEnumerable< TSource >	ThenBy< TSource, TKey > (this IOrderedEnumerable< TSource > source, Func< TSource, TKey > keySelector)
	Performs a subsequent ordering of the elements in a sequence in ascending order according to a key. More...

static IOrderedEnumerable< TSource >	ThenBy< TSource, TKey > (this IOrderedEnumerable< TSource > source, Func< TSource, TKey > keySelector, IComparer< TKey > comparer)
	Performs a subsequent ordering of the elements in a sequence in ascending order by using a specified comparer. More...

static IOrderedEnumerable< TSource >	ThenByDescending< TSource, TKey > (this IOrderedEnumerable< TSource > source, Func< TSource, TKey > keySelector)
	Performs a subsequent ordering of the elements in a sequence in descending order, according to a key. More...

static IOrderedEnumerable< TSource >	ThenByDescending< TSource, TKey > (this IOrderedEnumerable< TSource > source, Func< TSource, TKey > keySelector, IComparer< TKey > comparer)
	Performs a subsequent ordering of the elements in a sequence in descending order by using a specified comparer. More...

static IEnumerable< IGrouping< TKey, TSource > >	GroupBy< TSource, TKey > (this IEnumerable< TSource > source, Func< TSource, TKey > keySelector)
	Groups the elements of a sequence according to a specified key selector function. More...

static IEnumerable< IGrouping< TKey, TSource > >	GroupBy< TSource, TKey > (this IEnumerable< TSource > source, Func< TSource, TKey > keySelector, IEqualityComparer< TKey > comparer)
	Groups the elements of a sequence according to a specified key selector function and compares the keys by using a specified comparer. More...

static IEnumerable< IGrouping< TKey, TElement > >	GroupBy< TSource, TKey, TElement > (this IEnumerable< TSource > source, Func< TSource, TKey > keySelector, Func< TSource, TElement > elementSelector)
	Groups the elements of a sequence according to a specified key selector function and projects the elements for each group by using a specified function. More...

static IEnumerable< IGrouping< TKey, TElement > >	GroupBy< TSource, TKey, TElement > (this IEnumerable< TSource > source, Func< TSource, TKey > keySelector, Func< TSource, TElement > elementSelector, IEqualityComparer< TKey > comparer)
	Groups the elements of a sequence according to a key selector function. The keys are compared by using a comparer and each group's elements are projected by using a specified function. More...

static IEnumerable< TResult >	GroupBy< TSource, TKey, TResult > (this IEnumerable< TSource > source, Func< TSource, TKey > keySelector, Func< TKey, IEnumerable< TSource >, TResult > resultSelector)
	Groups the elements of a sequence according to a specified key selector function and creates a result value from each group and its key. More...

static IEnumerable< TResult >	GroupBy< TSource, TKey, TElement, TResult > (this IEnumerable< TSource > source, Func< TSource, TKey > keySelector, Func< TSource, TElement > elementSelector, Func< TKey, IEnumerable< TElement >, TResult > resultSelector)
	Groups the elements of a sequence according to a specified key selector function and creates a result value from each group and its key. The elements of each group are projected by using a specified function. More...

static IEnumerable< TResult >	GroupBy< TSource, TKey, TResult > (this IEnumerable< TSource > source, Func< TSource, TKey > keySelector, Func< TKey, IEnumerable< TSource >, TResult > resultSelector, IEqualityComparer< TKey > comparer)
	Groups the elements of a sequence according to a specified key selector function and creates a result value from each group and its key. The keys are compared by using a specified comparer. More...

static IEnumerable< TResult >	GroupBy< TSource, TKey, TElement, TResult > (this IEnumerable< TSource > source, Func< TSource, TKey > keySelector, Func< TSource, TElement > elementSelector, Func< TKey, IEnumerable< TElement >, TResult > resultSelector, IEqualityComparer< TKey > comparer)
	Groups the elements of a sequence according to a specified key selector function and creates a result value from each group and its key. Key values are compared by using a specified comparer, and the elements of each group are projected by using a specified function. More...

static IEnumerable< TSource >	Concat< TSource > (this IEnumerable< TSource > first, IEnumerable< TSource > second)
	Concatenates two sequences. More...

static IEnumerable< TResult >	Zip< TFirst, TSecond, TResult > (this IEnumerable< TFirst > first, IEnumerable< TSecond > second, Func< TFirst, TSecond, TResult > resultSelector)
	Applies a specified function to the corresponding elements of two sequences, producing a sequence of the results. More...

static IEnumerable< TSource >	Distinct< TSource > (this IEnumerable< TSource > source)
	Returns distinct elements from a sequence by using the default equality comparer to compare values. More...

static IEnumerable< TSource >	Distinct< TSource > (this IEnumerable< TSource > source, IEqualityComparer< TSource > comparer)
	Returns distinct elements from a sequence by using a specified T:System.Collections.Generic.IEqualityComparer`1 to compare values. More...

static IEnumerable< TSource >	Union< TSource > (this IEnumerable< TSource > first, IEnumerable< TSource > second)
	Produces the set union of two sequences by using the default equality comparer. More...

static IEnumerable< TSource >	Union< TSource > (this IEnumerable< TSource > first, IEnumerable< TSource > second, IEqualityComparer< TSource > comparer)
	Produces the set union of two sequences by using a specified T:System.Collections.Generic.IEqualityComparer`1. More...

static IEnumerable< TSource >	Intersect< TSource > (this IEnumerable< TSource > first, IEnumerable< TSource > second)
	Produces the set intersection of two sequences by using the default equality comparer to compare values. More...

static IEnumerable< TSource >	Intersect< TSource > (this IEnumerable< TSource > first, IEnumerable< TSource > second, IEqualityComparer< TSource > comparer)
	Produces the set intersection of two sequences by using the specified T:System.Collections.Generic.IEqualityComparer`1 to compare values. More...

static IEnumerable< TSource >	Except< TSource > (this IEnumerable< TSource > first, IEnumerable< TSource > second)
	Produces the set difference of two sequences by using the default equality comparer to compare values. More...

static IEnumerable< TSource >	Except< TSource > (this IEnumerable< TSource > first, IEnumerable< TSource > second, IEqualityComparer< TSource > comparer)
	Produces the set difference of two sequences by using the specified T:System.Collections.Generic.IEqualityComparer`1 to compare values. More...

static IEnumerable< TSource >	Reverse< TSource > (this IEnumerable< TSource > source)
	Inverts the order of the elements in a sequence. More...

static bool	SequenceEqual< TSource > (this IEnumerable< TSource > first, IEnumerable< TSource > second)
	Determines whether two sequences are equal by comparing the elements by using the default equality comparer for their type. More...

static bool	SequenceEqual< TSource > (this IEnumerable< TSource > first, IEnumerable< TSource > second, IEqualityComparer< TSource > comparer)
	Determines whether two sequences are equal by comparing their elements by using a specified T:System.Collections.Generic.IEqualityComparer`1. More...

static IEnumerable< TSource >	AsEnumerable< TSource > (this IEnumerable< TSource > source)
	Returns the input typed as T:System.Collections.Generic.IEnumerable`1. More...

static TSource []	ToArray< TSource > (this IEnumerable< TSource > source)
	Creates an array from a T:System.Collections.Generic.IEnumerable`1. More...

static List< TSource >	ToList< TSource > (this IEnumerable< TSource > source)
	Creates a T:System.Collections.Generic.List`1 from an T:System.Collections.Generic.IEnumerable`1. More...

static Dictionary< TKey, TSource >	ToDictionary< TSource, TKey > (this IEnumerable< TSource > source, Func< TSource, TKey > keySelector)
	Creates a T:System.Collections.Generic.Dictionary`2 from an T:System.Collections.Generic.IEnumerable`1 according to a specified key selector function. More...

static Dictionary< TKey, TSource >	ToDictionary< TSource, TKey > (this IEnumerable< TSource > source, Func< TSource, TKey > keySelector, IEqualityComparer< TKey > comparer)
	Creates a T:System.Collections.Generic.Dictionary`2 from an T:System.Collections.Generic.IEnumerable`1 according to a specified key selector function and key comparer. More...

static Dictionary< TKey, TElement >	ToDictionary< TSource, TKey, TElement > (this IEnumerable< TSource > source, Func< TSource, TKey > keySelector, Func< TSource, TElement > elementSelector)
	Creates a T:System.Collections.Generic.Dictionary`2 from an T:System.Collections.Generic.IEnumerable`1 according to specified key selector and element selector functions. More...

static Dictionary< TKey, TElement >	ToDictionary< TSource, TKey, TElement > (this IEnumerable< TSource > source, Func< TSource, TKey > keySelector, Func< TSource, TElement > elementSelector, IEqualityComparer< TKey > comparer)
	Creates a T:System.Collections.Generic.Dictionary`2 from an T:System.Collections.Generic.IEnumerable`1 according to a specified key selector function, a comparer, and an element selector function. More...

static ILookup< TKey, TSource >	ToLookup< TSource, TKey > (this IEnumerable< TSource > source, Func< TSource, TKey > keySelector)
	Creates a T:System.Linq.Lookup`2 from an T:System.Collections.Generic.IEnumerable`1 according to a specified key selector function. More...

static ILookup< TKey, TSource >	ToLookup< TSource, TKey > (this IEnumerable< TSource > source, Func< TSource, TKey > keySelector, IEqualityComparer< TKey > comparer)
	Creates a T:System.Linq.Lookup`2 from an T:System.Collections.Generic.IEnumerable`1 according to a specified key selector function and key comparer. More...

static ILookup< TKey, TElement >	ToLookup< TSource, TKey, TElement > (this IEnumerable< TSource > source, Func< TSource, TKey > keySelector, Func< TSource, TElement > elementSelector)
	Creates a T:System.Linq.Lookup`2 from an T:System.Collections.Generic.IEnumerable`1 according to specified key selector and element selector functions. More...

static ILookup< TKey, TElement >	ToLookup< TSource, TKey, TElement > (this IEnumerable< TSource > source, Func< TSource, TKey > keySelector, Func< TSource, TElement > elementSelector, IEqualityComparer< TKey > comparer)
	Creates a T:System.Linq.Lookup`2 from an T:System.Collections.Generic.IEnumerable`1 according to a specified key selector function, a comparer and an element selector function. More...

static IEnumerable< TSource >	DefaultIfEmpty< TSource > (this IEnumerable< TSource > source)
	Returns the elements of the specified sequence or the type parameter's default value in a singleton collection if the sequence is empty. More...

static IEnumerable< TSource >	DefaultIfEmpty< TSource > (this IEnumerable< TSource > source, TSource defaultValue)
	Returns the elements of the specified sequence or the specified value in a singleton collection if the sequence is empty. More...

static IEnumerable< TResult >	OfType< TResult > (this IEnumerable source)
	Filters the elements of an T:System.Collections.IEnumerable based on a specified type. More...

static IEnumerable< TResult >	Cast< TResult > (this IEnumerable source)
	Casts the elements of an T:System.Collections.IEnumerable to the specified type. More...

static TSource	First< TSource > (this IEnumerable< TSource > source)
	Returns the first element of a sequence. More...

static TSource	First< TSource > (this IEnumerable< TSource > source, Func< TSource, bool > predicate)
	Returns the first element in a sequence that satisfies a specified condition. More...

static TSource	FirstOrDefault< TSource > (this IEnumerable< TSource > source)
	Returns the first element of a sequence, or a default value if the sequence contains no elements. More...

static TSource	FirstOrDefault< TSource > (this IEnumerable< TSource > source, Func< TSource, bool > predicate)
	Returns the first element of the sequence that satisfies a condition or a default value if no such element is found. More...

static TSource	Last< TSource > (this IEnumerable< TSource > source)
	Returns the last element of a sequence. More...

static TSource	Last< TSource > (this IEnumerable< TSource > source, Func< TSource, bool > predicate)
	Returns the last element of a sequence that satisfies a specified condition. More...

static TSource	LastOrDefault< TSource > (this IEnumerable< TSource > source)
	Returns the last element of a sequence, or a default value if the sequence contains no elements. More...

static TSource	LastOrDefault< TSource > (this IEnumerable< TSource > source, Func< TSource, bool > predicate)
	Returns the last element of a sequence that satisfies a condition or a default value if no such element is found. More...

static TSource	Single< TSource > (this IEnumerable< TSource > source)
	Returns the only element of a sequence, and throws an exception if there is not exactly one element in the sequence. More...

static TSource	Single< TSource > (this IEnumerable< TSource > source, Func< TSource, bool > predicate)
	Returns the only element of a sequence that satisfies a specified condition, and throws an exception if more than one such element exists. More...

static TSource	SingleOrDefault< TSource > (this IEnumerable< TSource > source)
	Returns the only element of a sequence, or a default value if the sequence is empty; this method throws an exception if there is more than one element in the sequence. More...

static TSource	SingleOrDefault< TSource > (this IEnumerable< TSource > source, Func< TSource, bool > predicate)
	Returns the only element of a sequence that satisfies a specified condition or a default value if no such element exists; this method throws an exception if more than one element satisfies the condition. More...

static TSource	ElementAt< TSource > (this IEnumerable< TSource > source, int index)
	Returns the element at a specified index in a sequence. More...

static TSource	ElementAtOrDefault< TSource > (this IEnumerable< TSource > source, int index)
	Returns the element at a specified index in a sequence or a default value if the index is out of range. More...

static IEnumerable< int >	Range (int start, int count)
	Generates a sequence of integral numbers within a specified range. More...

static IEnumerable< TResult >	Repeat< TResult > (TResult element, int count)
	Generates a sequence that contains one repeated value. More...

static IEnumerable< TResult >	Empty< TResult > ()
	Returns an empty T:System.Collections.Generic.IEnumerable`1 that has the specified type argument. More...

static bool	Any< TSource > (this IEnumerable< TSource > source)
	Determines whether a sequence contains any elements. More...

static bool	Any< TSource > (this IEnumerable< TSource > source, Func< TSource, bool > predicate)
	Determines whether any element of a sequence satisfies a condition. More...

static bool	All< TSource > (this IEnumerable< TSource > source, Func< TSource, bool > predicate)
	Determines whether all elements of a sequence satisfy a condition. More...

static int	Count< TSource > (this IEnumerable< TSource > source)
	Returns the number of elements in a sequence. More...

static int	Count< TSource > (this IEnumerable< TSource > source, Func< TSource, bool > predicate)
	Returns a number that represents how many elements in the specified sequence satisfy a condition. More...

static long	LongCount< TSource > (this IEnumerable< TSource > source)
	Returns an T:System.Int64 that represents the total number of elements in a sequence. More...

static long	LongCount< TSource > (this IEnumerable< TSource > source, Func< TSource, bool > predicate)
	Returns an T:System.Int64 that represents how many elements in a sequence satisfy a condition. More...

static bool	Contains< TSource > (this IEnumerable< TSource > source, TSource value)
	Determines whether a sequence contains a specified element by using the default equality comparer. More...

static bool	Contains< TSource > (this IEnumerable< TSource > source, TSource value, IEqualityComparer< TSource > comparer)
	Determines whether a sequence contains a specified element by using a specified T:System.Collections.Generic.IEqualityComparer`1. More...

static TSource	Aggregate< TSource > (this IEnumerable< TSource > source, Func< TSource, TSource, TSource > func)
	Applies an accumulator function over a sequence. More...

static TAccumulate	Aggregate< TSource, TAccumulate > (this IEnumerable< TSource > source, TAccumulate seed, Func< TAccumulate, TSource, TAccumulate > func)
	Applies an accumulator function over a sequence. The specified seed value is used as the initial accumulator value. More...

static TResult	Aggregate< TSource, TAccumulate, TResult > (this IEnumerable< TSource > source, TAccumulate seed, Func< TAccumulate, TSource, TAccumulate > func, Func< TAccumulate, TResult > resultSelector)
	Applies an accumulator function over a sequence. The specified seed value is used as the initial accumulator value, and the specified function is used to select the result value. More...

static int	Sum (this IEnumerable< int > source)
	Computes the sum of a sequence of T:System.Int32 values. More...

static ? int	Sum (this IEnumerable< int?> source)
	Computes the sum of a sequence of nullable T:System.Int32 values. More...

static long	Sum (this IEnumerable< long > source)
	Computes the sum of a sequence of T:System.Int64 values. More...

static ? long	Sum (this IEnumerable< long?> source)
	Computes the sum of a sequence of nullable T:System.Int64 values. More...

static float	Sum (this IEnumerable< float > source)
	Computes the sum of a sequence of T:System.Single values. More...

static ? float	Sum (this IEnumerable< float?> source)
	Computes the sum of a sequence of nullable T:System.Single values. More...

static double	Sum (this IEnumerable< double > source)
	Computes the sum of a sequence of T:System.Double values. More...

static ? double	Sum (this IEnumerable< double?> source)
	Computes the sum of a sequence of nullable T:System.Double values. More...

static decimal	Sum (this IEnumerable< decimal > source)
	Computes the sum of a sequence of T:System.Decimal values. More...

static ? decimal	Sum (this IEnumerable< decimal?> source)
	Computes the sum of a sequence of nullable T:System.Decimal values. More...

static int	Sum< TSource > (this IEnumerable< TSource > source, Func< TSource, int > selector)
	Computes the sum of the sequence of T:System.Int32 values that are obtained by invoking a transform function on each element of the input sequence. More...

static ? int	Sum< TSource > (this IEnumerable< TSource > source, Func< TSource, int?> selector)
	Computes the sum of the sequence of nullable T:System.Int32 values that are obtained by invoking a transform function on each element of the input sequence. More...

static long	Sum< TSource > (this IEnumerable< TSource > source, Func< TSource, long > selector)
	Computes the sum of the sequence of T:System.Int64 values that are obtained by invoking a transform function on each element of the input sequence. More...

static ? long	Sum< TSource > (this IEnumerable< TSource > source, Func< TSource, long?> selector)
	Computes the sum of the sequence of nullable T:System.Int64 values that are obtained by invoking a transform function on each element of the input sequence. More...

static float	Sum< TSource > (this IEnumerable< TSource > source, Func< TSource, float > selector)
	Computes the sum of the sequence of T:System.Single values that are obtained by invoking a transform function on each element of the input sequence. More...

static ? float	Sum< TSource > (this IEnumerable< TSource > source, Func< TSource, float?> selector)
	Computes the sum of the sequence of nullable T:System.Single values that are obtained by invoking a transform function on each element of the input sequence. More...

static double	Sum< TSource > (this IEnumerable< TSource > source, Func< TSource, double > selector)
	Computes the sum of the sequence of T:System.Double values that are obtained by invoking a transform function on each element of the input sequence. More...

static ? double	Sum< TSource > (this IEnumerable< TSource > source, Func< TSource, double?> selector)
	Computes the sum of the sequence of nullable T:System.Double values that are obtained by invoking a transform function on each element of the input sequence. More...

static decimal	Sum< TSource > (this IEnumerable< TSource > source, Func< TSource, decimal > selector)
	Computes the sum of the sequence of T:System.Decimal values that are obtained by invoking a transform function on each element of the input sequence. More...

static ? decimal	Sum< TSource > (this IEnumerable< TSource > source, Func< TSource, decimal?> selector)
	Computes the sum of the sequence of nullable T:System.Decimal values that are obtained by invoking a transform function on each element of the input sequence. More...

static int	Min (this IEnumerable< int > source)
	Returns the minimum value in a sequence of T:System.Int32 values. More...

static ? int	Min (this IEnumerable< int?> source)
	Returns the minimum value in a sequence of nullable T:System.Int32 values. More...

static long	Min (this IEnumerable< long > source)
	Returns the minimum value in a sequence of T:System.Int64 values. More...

static ? long	Min (this IEnumerable< long?> source)
	Returns the minimum value in a sequence of nullable T:System.Int64 values. More...

static float	Min (this IEnumerable< float > source)
	Returns the minimum value in a sequence of T:System.Single values. More...

static ? float	Min (this IEnumerable< float?> source)
	Returns the minimum value in a sequence of nullable T:System.Single values. More...

static double	Min (this IEnumerable< double > source)
	Returns the minimum value in a sequence of T:System.Double values. More...

static ? double	Min (this IEnumerable< double?> source)
	Returns the minimum value in a sequence of nullable T:System.Double values. More...

static decimal	Min (this IEnumerable< decimal > source)
	Returns the minimum value in a sequence of T:System.Decimal values. More...

static ? decimal	Min (this IEnumerable< decimal?> source)
	Returns the minimum value in a sequence of nullable T:System.Decimal values. More...

static TSource	Min< TSource > (this IEnumerable< TSource > source)
	Returns the minimum value in a generic sequence. More...

static int	Min< TSource > (this IEnumerable< TSource > source, Func< TSource, int > selector)
	Invokes a transform function on each element of a sequence and returns the minimum T:System.Int32 value. More...

static ? int	Min< TSource > (this IEnumerable< TSource > source, Func< TSource, int?> selector)
	Invokes a transform function on each element of a sequence and returns the minimum nullable T:System.Int32 value. More...

static long	Min< TSource > (this IEnumerable< TSource > source, Func< TSource, long > selector)
	Invokes a transform function on each element of a sequence and returns the minimum T:System.Int64 value. More...

static ? long	Min< TSource > (this IEnumerable< TSource > source, Func< TSource, long?> selector)
	Invokes a transform function on each element of a sequence and returns the minimum nullable T:System.Int64 value. More...

static float	Min< TSource > (this IEnumerable< TSource > source, Func< TSource, float > selector)
	Invokes a transform function on each element of a sequence and returns the minimum T:System.Single value. More...

static ? float	Min< TSource > (this IEnumerable< TSource > source, Func< TSource, float?> selector)
	Invokes a transform function on each element of a sequence and returns the minimum nullable T:System.Single value. More...

static double	Min< TSource > (this IEnumerable< TSource > source, Func< TSource, double > selector)
	Invokes a transform function on each element of a sequence and returns the minimum T:System.Double value. More...

static ? double	Min< TSource > (this IEnumerable< TSource > source, Func< TSource, double?> selector)
	Invokes a transform function on each element of a sequence and returns the minimum nullable T:System.Double value. More...

static decimal	Min< TSource > (this IEnumerable< TSource > source, Func< TSource, decimal > selector)
	Invokes a transform function on each element of a sequence and returns the minimum T:System.Decimal value. More...

static ? decimal	Min< TSource > (this IEnumerable< TSource > source, Func< TSource, decimal?> selector)
	Invokes a transform function on each element of a sequence and returns the minimum nullable T:System.Decimal value. More...

static TResult	Min< TSource, TResult > (this IEnumerable< TSource > source, Func< TSource, TResult > selector)
	Invokes a transform function on each element of a generic sequence and returns the minimum resulting value. More...

static int	Max (this IEnumerable< int > source)
	Returns the maximum value in a sequence of T:System.Int32 values. More...

static ? int	Max (this IEnumerable< int?> source)
	Returns the maximum value in a sequence of nullable T:System.Int32 values. More...

static long	Max (this IEnumerable< long > source)
	Returns the maximum value in a sequence of T:System.Int64 values. More...

static ? long	Max (this IEnumerable< long?> source)
	Returns the maximum value in a sequence of nullable T:System.Int64 values. More...

static double	Max (this IEnumerable< double > source)
	Returns the maximum value in a sequence of T:System.Double values. More...

static ? double	Max (this IEnumerable< double?> source)
	Returns the maximum value in a sequence of nullable T:System.Double values. More...

static float	Max (this IEnumerable< float > source)
	Returns the maximum value in a sequence of T:System.Single values. More...

static ? float	Max (this IEnumerable< float?> source)
	Returns the maximum value in a sequence of nullable T:System.Single values. More...

static decimal	Max (this IEnumerable< decimal > source)
	Returns the maximum value in a sequence of T:System.Decimal values. More...

static ? decimal	Max (this IEnumerable< decimal?> source)
	Returns the maximum value in a sequence of nullable T:System.Decimal values. More...

static TSource	Max< TSource > (this IEnumerable< TSource > source)
	Returns the maximum value in a generic sequence. More...

static int	Max< TSource > (this IEnumerable< TSource > source, Func< TSource, int > selector)
	Invokes a transform function on each element of a sequence and returns the maximum T:System.Int32 value. More...

static ? int	Max< TSource > (this IEnumerable< TSource > source, Func< TSource, int?> selector)
	Invokes a transform function on each element of a sequence and returns the maximum nullable T:System.Int32 value. More...

static long	Max< TSource > (this IEnumerable< TSource > source, Func< TSource, long > selector)
	Invokes a transform function on each element of a sequence and returns the maximum T:System.Int64 value. More...

static ? long	Max< TSource > (this IEnumerable< TSource > source, Func< TSource, long?> selector)
	Invokes a transform function on each element of a sequence and returns the maximum nullable T:System.Int64 value. More...

static float	Max< TSource > (this IEnumerable< TSource > source, Func< TSource, float > selector)
	Invokes a transform function on each element of a sequence and returns the maximum T:System.Single value. More...

static ? float	Max< TSource > (this IEnumerable< TSource > source, Func< TSource, float?> selector)
	Invokes a transform function on each element of a sequence and returns the maximum nullable T:System.Single value. More...

static double	Max< TSource > (this IEnumerable< TSource > source, Func< TSource, double > selector)
	Invokes a transform function on each element of a sequence and returns the maximum T:System.Double value. More...

static ? double	Max< TSource > (this IEnumerable< TSource > source, Func< TSource, double?> selector)
	Invokes a transform function on each element of a sequence and returns the maximum nullable T:System.Double value. More...

static decimal	Max< TSource > (this IEnumerable< TSource > source, Func< TSource, decimal > selector)
	Invokes a transform function on each element of a sequence and returns the maximum T:System.Decimal value. More...

static ? decimal	Max< TSource > (this IEnumerable< TSource > source, Func< TSource, decimal?> selector)
	Invokes a transform function on each element of a sequence and returns the maximum nullable T:System.Decimal value. More...

static TResult	Max< TSource, TResult > (this IEnumerable< TSource > source, Func< TSource, TResult > selector)
	Invokes a transform function on each element of a generic sequence and returns the maximum resulting value. More...

static double	Average (this IEnumerable< int > source)
	Computes the average of a sequence of T:System.Int32 values. More...

static ? double	Average (this IEnumerable< int?> source)
	Computes the average of a sequence of nullable T:System.Int32 values. More...

static double	Average (this IEnumerable< long > source)
	Computes the average of a sequence of T:System.Int64 values. More...

static ? double	Average (this IEnumerable< long?> source)
	Computes the average of a sequence of nullable T:System.Int64 values. More...

static float	Average (this IEnumerable< float > source)
	Computes the average of a sequence of T:System.Single values. More...

static ? float	Average (this IEnumerable< float?> source)
	Computes the average of a sequence of nullable T:System.Single values. More...

static double	Average (this IEnumerable< double > source)
	Computes the average of a sequence of T:System.Double values. More...

static ? double	Average (this IEnumerable< double?> source)
	Computes the average of a sequence of nullable T:System.Double values. More...

static decimal	Average (this IEnumerable< decimal > source)
	Computes the average of a sequence of T:System.Decimal values. More...

static ? decimal	Average (this IEnumerable< decimal?> source)
	Computes the average of a sequence of nullable T:System.Decimal values. More...

static double	Average< TSource > (this IEnumerable< TSource > source, Func< TSource, int > selector)
	Computes the average of a sequence of T:System.Int32 values that are obtained by invoking a transform function on each element of the input sequence. More...

static ? double	Average< TSource > (this IEnumerable< TSource > source, Func< TSource, int?> selector)
	Computes the average of a sequence of nullable T:System.Int32 values that are obtained by invoking a transform function on each element of the input sequence. More...

static double	Average< TSource > (this IEnumerable< TSource > source, Func< TSource, long > selector)
	Computes the average of a sequence of T:System.Int64 values that are obtained by invoking a transform function on each element of the input sequence. More...

static ? double	Average< TSource > (this IEnumerable< TSource > source, Func< TSource, long?> selector)
	Computes the average of a sequence of nullable T:System.Int64 values that are obtained by invoking a transform function on each element of the input sequence. More...

static float	Average< TSource > (this IEnumerable< TSource > source, Func< TSource, float > selector)
	Computes the average of a sequence of T:System.Single values that are obtained by invoking a transform function on each element of the input sequence. More...

static ? float	Average< TSource > (this IEnumerable< TSource > source, Func< TSource, float?> selector)
	Computes the average of a sequence of nullable T:System.Single values that are obtained by invoking a transform function on each element of the input sequence. More...

static double	Average< TSource > (this IEnumerable< TSource > source, Func< TSource, double > selector)
	Computes the average of a sequence of T:System.Double values that are obtained by invoking a transform function on each element of the input sequence. More...

static ? double	Average< TSource > (this IEnumerable< TSource > source, Func< TSource, double?> selector)
	Computes the average of a sequence of nullable T:System.Double values that are obtained by invoking a transform function on each element of the input sequence. More...

static decimal	Average< TSource > (this IEnumerable< TSource > source, Func< TSource, decimal > selector)
	Computes the average of a sequence of T:System.Decimal values that are obtained by invoking a transform function on each element of the input sequence. More...

static ? decimal	Average< TSource > (this IEnumerable< TSource > source, Func< TSource, decimal?> selector)
	Computes the average of a sequence of nullable T:System.Decimal values that are obtained by invoking a transform function on each element of the input sequence. More...

static IEnumerable< TSource >	Append< TSource > (this IEnumerable< TSource > source, TSource element)
	Appends a value to the end of the sequence. More...

static IEnumerable< TSource >	Prepend< TSource > (this IEnumerable< TSource > source, TSource element)
	Adds a value to the beginning of the sequence. More...

Detailed Description

Provides a set of static (Shared in Visual Basic) methods for querying objects that implement T:System.Collections.Generic.IEnumerable`1.

Definition at line 9 of file Enumerable.cs.

Member Function Documentation

◆ Aggregate< TSource >()

static TSource System.Linq.Enumerable.Aggregate< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, TSource, TSource >	func
	)

static

Applies an accumulator function over a sequence.

Parameters

source	An T:System.Collections.Generic.IEnumerable`1 to aggregate over.
func	An accumulator function to be invoked on each element.

Template Parameters

TSource The type of the elements of source .

Returns: The final accumulator value.

Exceptions

T:System.ArgumentNullException	source or func is `null`.
T:System.InvalidOperationException	source contains no elements.

Definition at line 3392 of file Enumerable.cs.

◆ Aggregate< TSource, TAccumulate >()

static TAccumulate System.Linq.Enumerable.Aggregate< TSource, TAccumulate >	(	this IEnumerable< TSource >	source,
		TAccumulate	seed,
		Func< TAccumulate, TSource, TAccumulate >	func
	)

static

Applies an accumulator function over a sequence. The specified seed value is used as the initial accumulator value.

Parameters

source	An T:System.Collections.Generic.IEnumerable`1 to aggregate over.
seed	The initial accumulator value.
func	An accumulator function to be invoked on each element.

Template Parameters

TSource	The type of the elements of source .
TAccumulate	The type of the accumulator value.

Returns: The final accumulator value.

Exceptions

T:System.ArgumentNullException source or func is null.

Definition at line 3427 of file Enumerable.cs.

◆ Aggregate< TSource, TAccumulate, TResult >()

static TResult System.Linq.Enumerable.Aggregate< TSource, TAccumulate, TResult >	(	this IEnumerable< TSource >	source,
		TAccumulate	seed,
		Func< TAccumulate, TSource, TAccumulate >	func,
		Func< TAccumulate, TResult >	resultSelector
	)

static

Applies an accumulator function over a sequence. The specified seed value is used as the initial accumulator value, and the specified function is used to select the result value.

Parameters

source	An T:System.Collections.Generic.IEnumerable`1 to aggregate over.
seed	The initial accumulator value.
func	An accumulator function to be invoked on each element.
resultSelector	A function to transform the final accumulator value into the result value.

Template Parameters

TSource	The type of the elements of source .
TAccumulate	The type of the accumulator value.
TResult	The type of the resulting value.

Returns: The transformed final accumulator value.

Exceptions

T:System.ArgumentNullException source or func or resultSelector is null.

Definition at line 3457 of file Enumerable.cs.

◆ All< TSource >()

static bool System.Linq.Enumerable.All< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, bool >	predicate
	)

static

Determines whether all elements of a sequence satisfy a condition.

Parameters

source	An T:System.Collections.Generic.IEnumerable`1 that contains the elements to apply the predicate to.
predicate	A function to test each element for a condition.

Template Parameters

TSource The type of the elements of source .

Returns: true if every element of the source sequence passes the test in the specified predicate, or if the sequence is empty; otherwise, false.

Exceptions

T:System.ArgumentNullException source or predicate is null.

Definition at line 3198 of file Enumerable.cs.

◆ Any< TSource >() [1/2]

static bool System.Linq.Enumerable.Any< TSource > ( this IEnumerable< TSource > source )

static

Determines whether a sequence contains any elements.

Parameters

source The T:System.Collections.Generic.IEnumerable`1 to check for emptiness.

Template Parameters

TSource The type of the elements of source .

Returns: true if the source sequence contains any elements; otherwise, false.

Exceptions

T:System.ArgumentNullException source is null.

Definition at line 3144 of file Enumerable.cs.

◆ Any< TSource >() [2/2]

static bool System.Linq.Enumerable.Any< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, bool >	predicate
	)

static

Determines whether any element of a sequence satisfies a condition.

Parameters

source	An T:System.Collections.Generic.IEnumerable`1 whose elements to apply the predicate to.
predicate	A function to test each element for a condition.

Template Parameters

TSource The type of the elements of source .

Returns: true if any elements in the source sequence pass the test in the specified predicate; otherwise, false.

Exceptions

T:System.ArgumentNullException source or predicate is null.

Definition at line 3169 of file Enumerable.cs.

◆ Append< TSource >()

static IEnumerable<TSource> System.Linq.Enumerable.Append< TSource >	(	this IEnumerable< TSource >	source,
		TSource	element
	)

static

Appends a value to the end of the sequence.

Parameters

source	A sequence of values.
element	The value to append to source .

Template Parameters

TSource The type of the elements of source .

Returns: A new sequence that ends with element .

Exceptions

T:System.ArgumentNullException source is null.

Definition at line 5302 of file Enumerable.cs.

◆ AsEnumerable< TSource >()

static IEnumerable<TSource> System.Linq.Enumerable.AsEnumerable< TSource > ( this IEnumerable< TSource > source )

static

Returns the input typed as T:System.Collections.Generic.IEnumerable`1.

Parameters

source The sequence to type as T:System.Collections.Generic.IEnumerable`1.

Template Parameters

TSource The type of the elements of source .

Returns: The input sequence typed as T:System.Collections.Generic.IEnumerable`1.

Definition at line 2258 of file Enumerable.cs.

◆ Average() [1/10]

static double System.Linq.Enumerable.Average ( this IEnumerable< int > source )

static

Computes the average of a sequence of T:System.Int32 values.

Parameters

source A sequence of T:System.Int32 values to calculate the average of.

Returns: The average of the sequence of values.

Exceptions

T:System.ArgumentNullException	source is `null`.
T:System.InvalidOperationException	source contains no elements.

Definition at line 4860 of file Enumerable.cs.

◆ Average() [2/10]

static ? double System.Linq.Enumerable.Average ( this IEnumerable< int?> source )

static

Computes the average of a sequence of nullable T:System.Int32 values.

Parameters

source A sequence of nullable T:System.Int32 values to calculate the average of.

Returns: The average of the sequence of values, or null if the source sequence is empty or contains only values that are null.

Exceptions

T:System.ArgumentNullException	source is `null`.
T:System.OverflowException	The sum of the elements in the sequence is larger than F:System.Int64.MaxValue.

Definition at line 4890 of file Enumerable.cs.

◆ Average() [3/10]

static double System.Linq.Enumerable.Average ( this IEnumerable< long > source )

static

Computes the average of a sequence of T:System.Int64 values.

Parameters

source A sequence of T:System.Int64 values to calculate the average of.

Returns: The average of the sequence of values.

Exceptions

T:System.ArgumentNullException	source is `null`.
T:System.InvalidOperationException	source contains no elements.

Definition at line 4924 of file Enumerable.cs.

◆ Average() [4/10]

static ? double System.Linq.Enumerable.Average ( this IEnumerable< long?> source )

static

Computes the average of a sequence of nullable T:System.Int64 values.

Parameters

source A sequence of nullable T:System.Int64 values to calculate the average of.

Returns: The average of the sequence of values, or null if the source sequence is empty or contains only values that are null.

Exceptions

T:System.ArgumentNullException	source is `null`.
T:System.OverflowException	The sum of the elements in the sequence is larger than F:System.Int64.MaxValue.

Definition at line 4954 of file Enumerable.cs.

◆ Average() [5/10]

static float System.Linq.Enumerable.Average ( this IEnumerable< float > source )

static

Computes the average of a sequence of T:System.Single values.

Parameters

source A sequence of T:System.Single values to calculate the average of.

Returns: The average of the sequence of values.

Exceptions

T:System.ArgumentNullException	source is `null`.
T:System.InvalidOperationException	source contains no elements.

Definition at line 4988 of file Enumerable.cs.

◆ Average() [6/10]

static ? float System.Linq.Enumerable.Average ( this IEnumerable< float?> source )

static

Computes the average of a sequence of nullable T:System.Single values.

Parameters

source A sequence of nullable T:System.Single values to calculate the average of.

Returns: The average of the sequence of values, or null if the source sequence is empty or contains only values that are null.

Exceptions

T:System.ArgumentNullException source is null.

Definition at line 5014 of file Enumerable.cs.

◆ Average() [7/10]

static double System.Linq.Enumerable.Average ( this IEnumerable< double > source )

static

Computes the average of a sequence of T:System.Double values.

Parameters

source A sequence of T:System.Double values to calculate the average of.

Returns: The average of the sequence of values.

Exceptions

T:System.ArgumentNullException	source is `null`.
T:System.InvalidOperationException	source contains no elements.

Definition at line 5045 of file Enumerable.cs.

◆ Average() [8/10]

static ? double System.Linq.Enumerable.Average ( this IEnumerable< double?> source )

static

Computes the average of a sequence of nullable T:System.Double values.

Parameters

source A sequence of nullable T:System.Double values to calculate the average of.

Returns: The average of the sequence of values, or null if the source sequence is empty or contains only values that are null.

Exceptions

T:System.ArgumentNullException source is null.

Definition at line 5071 of file Enumerable.cs.

◆ Average() [9/10]

static decimal System.Linq.Enumerable.Average ( this IEnumerable< decimal > source )

static

Computes the average of a sequence of T:System.Decimal values.

Parameters

source A sequence of T:System.Decimal values to calculate the average of.

Returns: The average of the sequence of values.

Exceptions

T:System.ArgumentNullException	source is `null`.
T:System.InvalidOperationException	source contains no elements.

Definition at line 5102 of file Enumerable.cs.

◆ Average() [10/10]

static ? decimal System.Linq.Enumerable.Average ( this IEnumerable< decimal?> source )

static

Computes the average of a sequence of nullable T:System.Decimal values.

Parameters

source A sequence of nullable T:System.Decimal values to calculate the average of.

Returns: The average of the sequence of values, or null if the source sequence is empty or contains only values that are null.

Exceptions

T:System.ArgumentNullException	source is `null`.
T:System.OverflowException	The sum of the elements in the sequence is larger than F:System.Decimal.MaxValue.

Definition at line 5129 of file Enumerable.cs.

◆ Average< TSource >() [1/10]

static double System.Linq.Enumerable.Average< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, int >	selector
	)

static

Computes the average of a sequence of T:System.Int32 values that are obtained by invoking a transform function on each element of the input sequence.

Parameters

source	A sequence of values to calculate the average of.
selector	A transform function to apply to each element.

Template Parameters

TSource The type of the elements of source .

Returns: The average of the sequence of values.

Exceptions

T:System.ArgumentNullException	source or selector is `null`.
T:System.InvalidOperationException	source contains no elements.
T:System.OverflowException	The sum of the elements in the sequence is larger than F:System.Int64.MaxValue.

Definition at line 5163 of file Enumerable.cs.

◆ Average< TSource >() [2/10]

static ? double System.Linq.Enumerable.Average< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, int?>	selector
	)

static

Computes the average of a sequence of nullable T:System.Int32 values that are obtained by invoking a transform function on each element of the input sequence.

Parameters

source	A sequence of values to calculate the average of.
selector	A transform function to apply to each element.

Template Parameters

TSource The type of the elements of source .

Returns: The average of the sequence of values, or null if the source sequence is empty or contains only values that are null.

Exceptions

T:System.ArgumentNullException	source or selector is `null`.
T:System.OverflowException	The sum of the elements in the sequence is larger than F:System.Int64.MaxValue.

Definition at line 5177 of file Enumerable.cs.

◆ Average< TSource >() [3/10]

static double System.Linq.Enumerable.Average< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, long >	selector
	)

static

Computes the average of a sequence of T:System.Int64 values that are obtained by invoking a transform function on each element of the input sequence.

Parameters

source	A sequence of values to calculate the average of.
selector	A transform function to apply to each element.

Template Parameters

TSource The type of the elements of source.

Returns: The average of the sequence of values.

Exceptions

T:System.ArgumentNullException	source or selector is `null`.
T:System.InvalidOperationException	source contains no elements.
T:System.OverflowException	The sum of the elements in the sequence is larger than F:System.Int64.MaxValue.

Definition at line 5193 of file Enumerable.cs.

◆ Average< TSource >() [4/10]

static ? double System.Linq.Enumerable.Average< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, long?>	selector
	)

static

Computes the average of a sequence of nullable T:System.Int64 values that are obtained by invoking a transform function on each element of the input sequence.

Parameters

source	A sequence of values to calculate the average of.
selector	A transform function to apply to each element.

Template Parameters

TSource The type of the elements of source .

Returns: The average of the sequence of values, or null if the source sequence is empty or contains only values that are null.

Definition at line 5204 of file Enumerable.cs.

◆ Average< TSource >() [5/10]

static float System.Linq.Enumerable.Average< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, float >	selector
	)

static

Computes the average of a sequence of T:System.Single values that are obtained by invoking a transform function on each element of the input sequence.

Parameters

source	A sequence of values to calculate the average of.
selector	A transform function to apply to each element.

Template Parameters

TSource The type of the elements of source .

Returns: The average of the sequence of values.

Exceptions

T:System.ArgumentNullException	source or selector is `null`.
T:System.InvalidOperationException	source contains no elements.

Definition at line 5219 of file Enumerable.cs.

◆ Average< TSource >() [6/10]

static ? float System.Linq.Enumerable.Average< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, float?>	selector
	)

static

Computes the average of a sequence of nullable T:System.Single values that are obtained by invoking a transform function on each element of the input sequence.

Parameters

source	A sequence of values to calculate the average of.
selector	A transform function to apply to each element.

Template Parameters

TSource The type of the elements of source .

Returns: The average of the sequence of values, or null if the source sequence is empty or contains only values that are null.

Exceptions

T:System.ArgumentNullException source or selector is null.

Definition at line 5232 of file Enumerable.cs.

◆ Average< TSource >() [7/10]

static double System.Linq.Enumerable.Average< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, double >	selector
	)

static

Computes the average of a sequence of T:System.Double values that are obtained by invoking a transform function on each element of the input sequence.

Parameters

source	A sequence of values to calculate the average of.
selector	A transform function to apply to each element.

Template Parameters

TSource The type of the elements of source .

Returns: The average of the sequence of values.

Exceptions

T:System.ArgumentNullException	source or selector is `null`.
T:System.InvalidOperationException	source contains no elements.

Definition at line 5247 of file Enumerable.cs.

◆ Average< TSource >() [8/10]

static ? double System.Linq.Enumerable.Average< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, double?>	selector
	)

static

Computes the average of a sequence of nullable T:System.Double values that are obtained by invoking a transform function on each element of the input sequence.

Parameters

source	A sequence of values to calculate the average of.
selector	A transform function to apply to each element.

Template Parameters

TSource The type of the elements of source .

Returns: The average of the sequence of values, or null if the source sequence is empty or contains only values that are null.

Exceptions

T:System.ArgumentNullException source or selector is null.

Definition at line 5260 of file Enumerable.cs.

◆ Average< TSource >() [9/10]

static decimal System.Linq.Enumerable.Average< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, decimal >	selector
	)

static

Computes the average of a sequence of T:System.Decimal values that are obtained by invoking a transform function on each element of the input sequence.

Parameters

source	A sequence of values that are used to calculate an average.
selector	A transform function to apply to each element.

Template Parameters

TSource The type of the elements of source .

Returns: The average of the sequence of values.

Exceptions

T:System.ArgumentNullException	source or selector is `null`.
T:System.InvalidOperationException	source contains no elements.
T:System.OverflowException	The sum of the elements in the sequence is larger than F:System.Decimal.MaxValue.

Definition at line 5276 of file Enumerable.cs.

◆ Average< TSource >() [10/10]

static ? decimal System.Linq.Enumerable.Average< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, decimal?>	selector
	)

static

Computes the average of a sequence of nullable T:System.Decimal values that are obtained by invoking a transform function on each element of the input sequence.

Parameters

source	A sequence of values to calculate the average of.
selector	A transform function to apply to each element.

Template Parameters

TSource The type of the elements of source .

Returns: The average of the sequence of values, or null if the source sequence is empty or contains only values that are null.

Exceptions

T:System.ArgumentNullException	source or selector is `null`.
T:System.OverflowException	The sum of the elements in the sequence is larger than F:System.Decimal.MaxValue.

Definition at line 5290 of file Enumerable.cs.

◆ Cast< TResult >()

static IEnumerable<TResult> System.Linq.Enumerable.Cast< TResult > ( this IEnumerable source )

static

Casts the elements of an T:System.Collections.IEnumerable to the specified type.

Parameters

source The T:System.Collections.IEnumerable that contains the elements to be cast to type TResult .

Template Parameters

TResult The type to cast the elements of source to.

Returns: An T:System.Collections.Generic.IEnumerable`1 that contains each element of the source sequence cast to the specified type.

Exceptions

T:System.ArgumentNullException	source is `null`.
T:System.InvalidCastException	An element in the sequence cannot be cast to type TResult .

Definition at line 2529 of file Enumerable.cs.

◆ Concat< TSource >()

static IEnumerable<TSource> System.Linq.Enumerable.Concat< TSource >	(	this IEnumerable< TSource >	first,
		IEnumerable< TSource >	second
	)

static

Concatenates two sequences.

Parameters

first	The first sequence to concatenate.
second	The sequence to concatenate to the first sequence.

Template Parameters

TSource The type of the elements of the input sequences.

Returns: An T:System.Collections.Generic.IEnumerable`1 that contains the concatenated elements of the two input sequences.

Exceptions

T:System.ArgumentNullException first or second is null.

Definition at line 1878 of file Enumerable.cs.

◆ Contains< TSource >() [1/2]

static bool System.Linq.Enumerable.Contains< TSource >	(	this IEnumerable< TSource >	source,
		TSource	value
	)

static

Determines whether a sequence contains a specified element by using the default equality comparer.

Parameters

source	A sequence in which to locate a value.
value	The value to locate in the sequence.

Template Parameters

TSource The type of the elements of source .

Returns: true if the source sequence contains an element that has the specified value; otherwise, false.

Exceptions

T:System.ArgumentNullException source is null.

Definition at line 3347 of file Enumerable.cs.

◆ Contains< TSource >() [2/2]

static bool System.Linq.Enumerable.Contains< TSource >	(	this IEnumerable< TSource >	source,
		TSource	value,
		IEqualityComparer< TSource >	comparer
	)

static

Determines whether a sequence contains a specified element by using a specified T:System.Collections.Generic.IEqualityComparer`1.

Parameters

source	A sequence in which to locate a value.
value	The value to locate in the sequence.
comparer	An equality comparer to compare values.

Template Parameters

TSource The type of the elements of source .

Returns: true if the source sequence contains an element that has the specified value; otherwise, false.

Exceptions

T:System.ArgumentNullException source is null.

Definition at line 3362 of file Enumerable.cs.

◆ Count< TSource >() [1/2]

static int System.Linq.Enumerable.Count< TSource > ( this IEnumerable< TSource > source )

static

Returns the number of elements in a sequence.

Parameters

source A sequence that contains elements to be counted.

Template Parameters

TSource The type of the elements of source .

Returns: The number of elements in the input sequence.

Exceptions

T:System.ArgumentNullException	source is `null`.
T:System.OverflowException	The number of elements in source is larger than F:System.Int32.MaxValue.

Definition at line 3226 of file Enumerable.cs.

◆ Count< TSource >() [2/2]

static int System.Linq.Enumerable.Count< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, bool >	predicate
	)

static

Returns a number that represents how many elements in the specified sequence satisfy a condition.

Parameters

source	A sequence that contains elements to be tested and counted.
predicate	A function to test each element for a condition.

Template Parameters

TSource The type of the elements of source .

Returns: A number that represents how many elements in the sequence satisfy the condition in the predicate function.

Exceptions

T:System.ArgumentNullException	source or predicate is `null`.
T:System.OverflowException	The number of elements in source is larger than F:System.Int32.MaxValue.

Definition at line 3262 of file Enumerable.cs.

◆ DefaultIfEmpty< TSource >() [1/2]

static IEnumerable<TSource> System.Linq.Enumerable.DefaultIfEmpty< TSource > ( this IEnumerable< TSource > source )

static

Returns the elements of the specified sequence or the type parameter's default value in a singleton collection if the sequence is empty.

Parameters

source The sequence to return a default value for if it is empty.

Template Parameters

TSource The type of the elements of source .

Returns: An T:System.Collections.Generic.IEnumerable`1 object that contains the default value for the TSource type if source is empty; otherwise, source .

Exceptions

T:System.ArgumentNullException source is null.

Definition at line 2455 of file Enumerable.cs.

◆ DefaultIfEmpty< TSource >() [2/2]

static IEnumerable<TSource> System.Linq.Enumerable.DefaultIfEmpty< TSource >	(	this IEnumerable< TSource >	source,
		TSource	defaultValue
	)

static

Returns the elements of the specified sequence or the specified value in a singleton collection if the sequence is empty.

Parameters

source	The sequence to return the specified value for if it is empty.
defaultValue	The value to return if the sequence is empty.

Template Parameters

TSource The type of the elements of source .

Returns: An T:System.Collections.Generic.IEnumerable`1 that contains defaultValue if source is empty; otherwise, source .

Definition at line 2466 of file Enumerable.cs.

◆ Distinct< TSource >() [1/2]

static IEnumerable<TSource> System.Linq.Enumerable.Distinct< TSource > ( this IEnumerable< TSource > source )

static

Returns distinct elements from a sequence by using the default equality comparer to compare values.

Parameters

source The sequence to remove duplicate elements from.

Template Parameters

TSource The type of the elements of source .

Returns: An T:System.Collections.Generic.IEnumerable`1 that contains distinct elements from the source sequence.

Exceptions

T:System.ArgumentNullException source is null.

Definition at line 1952 of file Enumerable.cs.

◆ Distinct< TSource >() [2/2]

static IEnumerable<TSource> System.Linq.Enumerable.Distinct< TSource >	(	this IEnumerable< TSource >	source,
		IEqualityComparer< TSource >	comparer
	)

static

Returns distinct elements from a sequence by using a specified T:System.Collections.Generic.IEqualityComparer`1 to compare values.

Parameters

source	The sequence to remove duplicate elements from.
comparer	An T:System.Collections.Generic.IEqualityComparer`1 to compare values.

Template Parameters

TSource The type of the elements of source .

Returns: An T:System.Collections.Generic.IEnumerable`1 that contains distinct elements from the source sequence.

Exceptions

T:System.ArgumentNullException source is null.

Definition at line 1969 of file Enumerable.cs.

◆ ElementAt< TSource >()

static TSource System.Linq.Enumerable.ElementAt< TSource >	(	this IEnumerable< TSource >	source,
		int	index
	)

static

Returns the element at a specified index in a sequence.

Parameters

source	An T:System.Collections.Generic.IEnumerable`1 to return an element from.
index	The zero-based index of the element to retrieve.

Template Parameters

TSource The type of the elements of source .

Returns: The element at the specified position in the source sequence.

Exceptions

T:System.ArgumentNullException	source is `null`.
T:System.ArgumentOutOfRangeException	index is less than 0 or greater than or equal to the number of elements in source .

Definition at line 3004 of file Enumerable.cs.

◆ ElementAtOrDefault< TSource >()

static TSource System.Linq.Enumerable.ElementAtOrDefault< TSource >	(	this IEnumerable< TSource >	source,
		int	index
	)

static

Returns the element at a specified index in a sequence or a default value if the index is out of range.

Parameters

source	An T:System.Collections.Generic.IEnumerable`1 to return an element from.
index	The zero-based index of the element to retrieve.

Template Parameters

TSource The type of the elements of source .

Returns: default(TSource ) if the index is outside the bounds of the source sequence; otherwise, the element at the specified position in the source sequence.

Exceptions

T:System.ArgumentNullException source is null.

Definition at line 3042 of file Enumerable.cs.

◆ Empty< TResult >()

static IEnumerable<TResult> System.Linq.Enumerable.Empty< TResult > ( )

static

Returns an empty T:System.Collections.Generic.IEnumerable`1 that has the specified type argument.

Template Parameters

TResult The type to assign to the type parameter of the returned generic T:System.Collections.Generic.IEnumerable`1.

Returns: An empty T:System.Collections.Generic.IEnumerable`1 whose type argument is TResult .

Definition at line 3131 of file Enumerable.cs.

◆ Except< TSource >() [1/2]

static IEnumerable<TSource> System.Linq.Enumerable.Except< TSource >	(	this IEnumerable< TSource >	first,
		IEnumerable< TSource >	second
	)

static

Produces the set difference of two sequences by using the default equality comparer to compare values.

Parameters

first	An T:System.Collections.Generic.IEnumerable`1 whose elements that are not also in second will be returned.
second	An T:System.Collections.Generic.IEnumerable`1 whose elements that also occur in the first sequence will cause those elements to be removed from the returned sequence.

Template Parameters

TSource The type of the elements of the input sequences.

Returns: A sequence that contains the set difference of the elements of two sequences.

Exceptions

T:System.ArgumentNullException first or second is null.

Definition at line 2119 of file Enumerable.cs.

◆ Except< TSource >() [2/2]

static IEnumerable<TSource> System.Linq.Enumerable.Except< TSource >	(	this IEnumerable< TSource >	first,
		IEnumerable< TSource >	second,
		IEqualityComparer< TSource >	comparer
	)

static

Produces the set difference of two sequences by using the specified T:System.Collections.Generic.IEqualityComparer`1 to compare values.

Parameters

first	An T:System.Collections.Generic.IEnumerable`1 whose elements that are not also in second will be returned.
second	An T:System.Collections.Generic.IEnumerable`1 whose elements that also occur in the first sequence will cause those elements to be removed from the returned sequence.
comparer	An T:System.Collections.Generic.IEqualityComparer`1 to compare values.

Template Parameters

TSource The type of the elements of the input sequences.

Returns: A sequence that contains the set difference of the elements of two sequences.

Exceptions

T:System.ArgumentNullException first or second is null.

Definition at line 2141 of file Enumerable.cs.

◆ First< TSource >() [1/2]

static TSource System.Linq.Enumerable.First< TSource > ( this IEnumerable< TSource > source )

static

Returns the first element of a sequence.

Parameters

source The T:System.Collections.Generic.IEnumerable`1 to return the first element of.

Template Parameters

TSource The type of the elements of source .

Returns: The first element in the specified sequence.

Exceptions

T:System.ArgumentNullException	source is `null`.
T:System.InvalidOperationException	The source sequence is empty.

Definition at line 2559 of file Enumerable.cs.

◆ First< TSource >() [2/2]

static TSource System.Linq.Enumerable.First< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, bool >	predicate
	)

static

Returns the first element in a sequence that satisfies a specified condition.

Parameters

source	An T:System.Collections.Generic.IEnumerable`1 to return an element from.
predicate	A function to test each element for a condition.

Template Parameters

TSource The type of the elements of source .

Returns: The first element in the sequence that passes the test in the specified predicate function.

Exceptions

T:System.ArgumentNullException	source or predicate is `null`.
T:System.InvalidOperationException	No element satisfies the condition in predicate .-or-The source sequence is empty.

Definition at line 2595 of file Enumerable.cs.

◆ FirstOrDefault< TSource >() [1/2]

static TSource System.Linq.Enumerable.FirstOrDefault< TSource > ( this IEnumerable< TSource > source )

static

Returns the first element of a sequence, or a default value if the sequence contains no elements.

Parameters

source The T:System.Collections.Generic.IEnumerable`1 to return the first element of.

Template Parameters

TSource The type of the elements of source .

Returns: default(TSource ) if source is empty; otherwise, the first element in source .

Exceptions

T:System.ArgumentNullException source is null.

Definition at line 2623 of file Enumerable.cs.

◆ FirstOrDefault< TSource >() [2/2]

static TSource System.Linq.Enumerable.FirstOrDefault< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, bool >	predicate
	)

static

Returns the first element of the sequence that satisfies a condition or a default value if no such element is found.

Parameters

source	An T:System.Collections.Generic.IEnumerable`1 to return an element from.
predicate	A function to test each element for a condition.

Template Parameters

TSource The type of the elements of source .

Returns: default(TSource ) if source is empty or if no element passes the test specified by predicate ; otherwise, the first element in source that passes the test specified by predicate .

Exceptions

T:System.ArgumentNullException source or predicate is null.

Definition at line 2659 of file Enumerable.cs.

◆ GroupBy< TSource, TKey >() [1/2]

static IEnumerable<IGrouping<TKey, TSource> > System.Linq.Enumerable.GroupBy< TSource, TKey >	(	this IEnumerable< TSource >	source,
		Func< TSource, TKey >	keySelector
	)

static

Groups the elements of a sequence according to a specified key selector function.

Parameters

source	An T:System.Collections.Generic.IEnumerable`1 whose elements to group.
keySelector	A function to extract the key for each element.

Template Parameters

TSource	The type of the elements of source .
TKey	The type of the key returned by keySelector .

Returns: An IEnumerable<IGrouping<TKey, TSource>> in C# or IEnumerable(Of IGrouping(Of TKey, TSource)) in Visual Basic where each T:System.Linq.IGrouping`2 object contains a sequence of objects and a key.

Exceptions

T:System.ArgumentNullException source or keySelector is null.

Definition at line 1755 of file Enumerable.cs.

◆ GroupBy< TSource, TKey >() [2/2]

static IEnumerable<IGrouping<TKey, TSource> > System.Linq.Enumerable.GroupBy< TSource, TKey >	(	this IEnumerable< TSource >	source,
		Func< TSource, TKey >	keySelector,
		IEqualityComparer< TKey >	comparer
	)

static

Groups the elements of a sequence according to a specified key selector function and compares the keys by using a specified comparer.

Parameters

source	An T:System.Collections.Generic.IEnumerable`1 whose elements to group.
keySelector	A function to extract the key for each element.
comparer	An T:System.Collections.Generic.IEqualityComparer`1 to compare keys.

Template Parameters

TSource	The type of the elements of source .
TKey	The type of the key returned by keySelector .

Returns: An IEnumerable<IGrouping<TKey, TSource>> in C# or IEnumerable(Of IGrouping(Of TKey, TSource)) in Visual Basic where each T:System.Linq.IGrouping`2 object contains a collection of objects and a key.

Exceptions

T:System.ArgumentNullException source or keySelector is null.

Definition at line 1770 of file Enumerable.cs.

◆ GroupBy< TSource, TKey, TElement >() [1/2]

static IEnumerable<IGrouping<TKey, TElement> > System.Linq.Enumerable.GroupBy< TSource, TKey, TElement >	(	this IEnumerable< TSource >	source,
		Func< TSource, TKey >	keySelector,
		Func< TSource, TElement >	elementSelector
	)

static

Groups the elements of a sequence according to a specified key selector function and projects the elements for each group by using a specified function.

Parameters

source	An T:System.Collections.Generic.IEnumerable`1 whose elements to group.
keySelector	A function to extract the key for each element.
elementSelector	A function to map each source element to an element in the T:System.Linq.IGrouping`2.

Template Parameters

TSource	The type of the elements of source .
TKey	The type of the key returned by keySelector .
TElement	The type of the elements in the T:System.Linq.IGrouping`2.

Returns: An IEnumerable<IGrouping<TKey, TElement>> in C# or IEnumerable(Of IGrouping(Of TKey, TElement)) in Visual Basic where each T:System.Linq.IGrouping`2 object contains a collection of objects of type TElement and a key.

Exceptions

T:System.ArgumentNullException source or keySelector or elementSelector is null.

Definition at line 1786 of file Enumerable.cs.

◆ GroupBy< TSource, TKey, TElement >() [2/2]

static IEnumerable<IGrouping<TKey, TElement> > System.Linq.Enumerable.GroupBy< TSource, TKey, TElement >	(	this IEnumerable< TSource >	source,
		Func< TSource, TKey >	keySelector,
		Func< TSource, TElement >	elementSelector,
		IEqualityComparer< TKey >	comparer
	)

static

Groups the elements of a sequence according to a key selector function. The keys are compared by using a comparer and each group's elements are projected by using a specified function.

Parameters

source	An T:System.Collections.Generic.IEnumerable`1 whose elements to group.
keySelector	A function to extract the key for each element.
elementSelector	A function to map each source element to an element in an T:System.Linq.IGrouping`2.
comparer	An T:System.Collections.Generic.IEqualityComparer`1 to compare keys.

Template Parameters

TSource	The type of the elements of source .
TKey	The type of the key returned by keySelector .
TElement	The type of the elements in the T:System.Linq.IGrouping`2.

Returns: An IEnumerable<IGrouping<TKey, TElement>> in C# or IEnumerable(Of IGrouping(Of TKey, TElement)) in Visual Basic where each T:System.Linq.IGrouping`2 object contains a collection of objects of type TElement and a key.

Exceptions

T:System.ArgumentNullException source or keySelector or elementSelector is null.

Definition at line 1803 of file Enumerable.cs.

◆ GroupBy< TSource, TKey, TElement, TResult >() [1/2]

static IEnumerable<TResult> System.Linq.Enumerable.GroupBy< TSource, TKey, TElement, TResult >	(	this IEnumerable< TSource >	source,
		Func< TSource, TKey >	keySelector,
		Func< TSource, TElement >	elementSelector,
		Func< TKey, IEnumerable< TElement >, TResult >	resultSelector
	)

static

Groups the elements of a sequence according to a specified key selector function and creates a result value from each group and its key. The elements of each group are projected by using a specified function.

Parameters

source	An T:System.Collections.Generic.IEnumerable`1 whose elements to group.
keySelector	A function to extract the key for each element.
elementSelector	A function to map each source element to an element in an T:System.Linq.IGrouping`2.
resultSelector	A function to create a result value from each group.

Template Parameters

TSource	The type of the elements of source .
TKey	The type of the key returned by keySelector .
TElement	The type of the elements in each T:System.Linq.IGrouping`2.
TResult	The type of the result value returned by resultSelector .

Returns: A collection of elements of type TResult where each element represents a projection over a group and its key.

Definition at line 1833 of file Enumerable.cs.

◆ GroupBy< TSource, TKey, TElement, TResult >() [2/2]

static IEnumerable<TResult> System.Linq.Enumerable.GroupBy< TSource, TKey, TElement, TResult >	(	this IEnumerable< TSource >	source,
		Func< TSource, TKey >	keySelector,
		Func< TSource, TElement >	elementSelector,
		Func< TKey, IEnumerable< TElement >, TResult >	resultSelector,
		IEqualityComparer< TKey >	comparer
	)

static

Groups the elements of a sequence according to a specified key selector function and creates a result value from each group and its key. Key values are compared by using a specified comparer, and the elements of each group are projected by using a specified function.

Parameters

source	An T:System.Collections.Generic.IEnumerable`1 whose elements to group.
keySelector	A function to extract the key for each element.
elementSelector	A function to map each source element to an element in an T:System.Linq.IGrouping`2.
resultSelector	A function to create a result value from each group.
comparer	An T:System.Collections.Generic.IEqualityComparer`1 to compare keys with.

Template Parameters

TSource	The type of the elements of source .
TKey	The type of the key returned by keySelector .
TElement	The type of the elements in each T:System.Linq.IGrouping`2.
TResult	The type of the result value returned by resultSelector .

Returns: A collection of elements of type TResult where each element represents a projection over a group and its key.

Definition at line 1865 of file Enumerable.cs.

◆ GroupBy< TSource, TKey, TResult >() [1/2]

static IEnumerable<TResult> System.Linq.Enumerable.GroupBy< TSource, TKey, TResult >	(	this IEnumerable< TSource >	source,
		Func< TSource, TKey >	keySelector,
		Func< TKey, IEnumerable< TSource >, TResult >	resultSelector
	)

static

Groups the elements of a sequence according to a specified key selector function and creates a result value from each group and its key.

Parameters

source	An T:System.Collections.Generic.IEnumerable`1 whose elements to group.
keySelector	A function to extract the key for each element.
resultSelector	A function to create a result value from each group.

Template Parameters

TSource	The type of the elements of source .
TKey	The type of the key returned by keySelector .
TResult	The type of the result value returned by resultSelector .

Returns: A collection of elements of type TResult where each element represents a projection over a group and its key.

Definition at line 1817 of file Enumerable.cs.

◆ GroupBy< TSource, TKey, TResult >() [2/2]

static IEnumerable<TResult> System.Linq.Enumerable.GroupBy< TSource, TKey, TResult >	(	this IEnumerable< TSource >	source,
		Func< TSource, TKey >	keySelector,
		Func< TKey, IEnumerable< TSource >, TResult >	resultSelector,
		IEqualityComparer< TKey >	comparer
	)

static

Groups the elements of a sequence according to a specified key selector function and creates a result value from each group and its key. The keys are compared by using a specified comparer.

Parameters

source	An T:System.Collections.Generic.IEnumerable`1 whose elements to group.
keySelector	A function to extract the key for each element.
resultSelector	A function to create a result value from each group.
comparer	An T:System.Collections.Generic.IEqualityComparer`1 to compare keys with.

Template Parameters

TSource	The type of the elements of source .
TKey	The type of the key returned by keySelector .
TResult	The type of the result value returned by resultSelector .

Returns: A collection of elements of type TResult where each element represents a projection over a group and its key.

Definition at line 1848 of file Enumerable.cs.

◆ GroupJoin< TOuter, TInner, TKey, TResult >() [1/2]

static IEnumerable<TResult> System.Linq.Enumerable.GroupJoin< TOuter, TInner, TKey, TResult >	(	this IEnumerable< TOuter >	outer,
		IEnumerable< TInner >	inner,
		Func< TOuter, TKey >	outerKeySelector,
		Func< TInner, TKey >	innerKeySelector,
		Func< TOuter, IEnumerable< TInner >, TResult >	resultSelector
	)

static

Correlates the elements of two sequences based on equality of keys and groups the results. The default equality comparer is used to compare keys.

Parameters

outer	The first sequence to join.
inner	The sequence to join to the first sequence.
outerKeySelector	A function to extract the join key from each element of the first sequence.
innerKeySelector	A function to extract the join key from each element of the second sequence.
resultSelector	A function to create a result element from an element from the first sequence and a collection of matching elements from the second sequence.

Template Parameters

TOuter	The type of the elements of the first sequence.
TInner	The type of the elements of the second sequence.
TKey	The type of the keys returned by the key selector functions.
TResult	The type of the result elements.

Returns: An T:System.Collections.Generic.IEnumerable`1 that contains elements of type TResult that are obtained by performing a grouped join on two sequences.

Exceptions

T:System.ArgumentNullException outer or inner or outerKeySelector or innerKeySelector or resultSelector is null.

Definition at line 1540 of file Enumerable.cs.

◆ GroupJoin< TOuter, TInner, TKey, TResult >() [2/2]

static IEnumerable<TResult> System.Linq.Enumerable.GroupJoin< TOuter, TInner, TKey, TResult >	(	this IEnumerable< TOuter >	outer,
		IEnumerable< TInner >	inner,
		Func< TOuter, TKey >	outerKeySelector,
		Func< TInner, TKey >	innerKeySelector,
		Func< TOuter, IEnumerable< TInner >, TResult >	resultSelector,
		IEqualityComparer< TKey >	comparer
	)

static

Correlates the elements of two sequences based on key equality and groups the results. A specified T:System.Collections.Generic.IEqualityComparer`1 is used to compare keys.

Parameters

outer	The first sequence to join.
inner	The sequence to join to the first sequence.
outerKeySelector	A function to extract the join key from each element of the first sequence.
innerKeySelector	A function to extract the join key from each element of the second sequence.
resultSelector	A function to create a result element from an element from the first sequence and a collection of matching elements from the second sequence.
comparer	An T:System.Collections.Generic.IEqualityComparer`1 to hash and compare keys.

Template Parameters

TOuter	The type of the elements of the first sequence.
TInner	The type of the elements of the second sequence.
TKey	The type of the keys returned by the key selector functions.
TResult	The type of the result elements.

Returns: An T:System.Collections.Generic.IEnumerable`1 that contains elements of type TResult that are obtained by performing a grouped join on two sequences.

Exceptions

T:System.ArgumentNullException outer or inner or outerKeySelector or innerKeySelector or resultSelector is null.

Definition at line 1580 of file Enumerable.cs.

◆ Intersect< TSource >() [1/2]

static IEnumerable<TSource> System.Linq.Enumerable.Intersect< TSource >	(	this IEnumerable< TSource >	first,
		IEnumerable< TSource >	second
	)

static

Produces the set intersection of two sequences by using the default equality comparer to compare values.

Parameters

first	An T:System.Collections.Generic.IEnumerable`1 whose distinct elements that also appear in second will be returned.
second	An T:System.Collections.Generic.IEnumerable`1 whose distinct elements that also appear in the first sequence will be returned.

Template Parameters

TSource The type of the elements of the input sequences.

Returns: A sequence that contains the elements that form the set intersection of two sequences.

Exceptions

T:System.ArgumentNullException first or second is null.

Definition at line 2060 of file Enumerable.cs.

◆ Intersect< TSource >() [2/2]

static IEnumerable<TSource> System.Linq.Enumerable.Intersect< TSource >	(	this IEnumerable< TSource >	first,
		IEnumerable< TSource >	second,
		IEqualityComparer< TSource >	comparer
	)

static

Produces the set intersection of two sequences by using the specified T:System.Collections.Generic.IEqualityComparer`1 to compare values.

Parameters

first	An T:System.Collections.Generic.IEnumerable`1 whose distinct elements that also appear in second will be returned.
second	An T:System.Collections.Generic.IEnumerable`1 whose distinct elements that also appear in the first sequence will be returned.
comparer	An T:System.Collections.Generic.IEqualityComparer`1 to compare values.

Template Parameters

TSource The type of the elements of the input sequences.

Returns: A sequence that contains the elements that form the set intersection of two sequences.

Exceptions

T:System.ArgumentNullException first or second is null.

Definition at line 2082 of file Enumerable.cs.

◆ Join< TOuter, TInner, TKey, TResult >() [1/2]

static IEnumerable<TResult> System.Linq.Enumerable.Join< TOuter, TInner, TKey, TResult >	(	this IEnumerable< TOuter >	outer,
		IEnumerable< TInner >	inner,
		Func< TOuter, TKey >	outerKeySelector,
		Func< TInner, TKey >	innerKeySelector,
		Func< TOuter, TInner, TResult >	resultSelector
	)

static

Correlates the elements of two sequences based on matching keys. The default equality comparer is used to compare keys.

Parameters

outer	The first sequence to join.
inner	The sequence to join to the first sequence.
outerKeySelector	A function to extract the join key from each element of the first sequence.
innerKeySelector	A function to extract the join key from each element of the second sequence.
resultSelector	A function to create a result element from two matching elements.

Template Parameters

TOuter	The type of the elements of the first sequence.
TInner	The type of the elements of the second sequence.
TKey	The type of the keys returned by the key selector functions.
TResult	The type of the result elements.

Returns: An T:System.Collections.Generic.IEnumerable`1 that has elements of type TResult that are obtained by performing an inner join on two sequences.

Exceptions

T:System.ArgumentNullException outer or inner or outerKeySelector or innerKeySelector or resultSelector is null.

Definition at line 1445 of file Enumerable.cs.

◆ Join< TOuter, TInner, TKey, TResult >() [2/2]

static IEnumerable<TResult> System.Linq.Enumerable.Join< TOuter, TInner, TKey, TResult >	(	this IEnumerable< TOuter >	outer,
		IEnumerable< TInner >	inner,
		Func< TOuter, TKey >	outerKeySelector,
		Func< TInner, TKey >	innerKeySelector,
		Func< TOuter, TInner, TResult >	resultSelector,
		IEqualityComparer< TKey >	comparer
	)

static

Correlates the elements of two sequences based on matching keys. A specified T:System.Collections.Generic.IEqualityComparer`1 is used to compare keys.

Parameters

outer	The first sequence to join.
inner	The sequence to join to the first sequence.
outerKeySelector	A function to extract the join key from each element of the first sequence.
innerKeySelector	A function to extract the join key from each element of the second sequence.
resultSelector	A function to create a result element from two matching elements.
comparer	An T:System.Collections.Generic.IEqualityComparer`1 to hash and compare keys.

Template Parameters

TOuter	The type of the elements of the first sequence.
TInner	The type of the elements of the second sequence.
TKey	The type of the keys returned by the key selector functions.
TResult	The type of the result elements.

Returns: An T:System.Collections.Generic.IEnumerable`1 that has elements of type TResult that are obtained by performing an inner join on two sequences.

Exceptions

T:System.ArgumentNullException outer or inner or outerKeySelector or innerKeySelector or resultSelector is null.

Definition at line 1485 of file Enumerable.cs.

◆ Last< TSource >() [1/2]

static TSource System.Linq.Enumerable.Last< TSource > ( this IEnumerable< TSource > source )

static

Returns the last element of a sequence.

Parameters

source An T:System.Collections.Generic.IEnumerable`1 to return the last element of.

Template Parameters

TSource The type of the elements of source .

Returns: The value at the last position in the source sequence.

Exceptions

T:System.ArgumentNullException	source is `null`.
T:System.InvalidOperationException	The source sequence is empty.

Definition at line 2687 of file Enumerable.cs.

◆ Last< TSource >() [2/2]

static TSource System.Linq.Enumerable.Last< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, bool >	predicate
	)

static

Returns the last element of a sequence that satisfies a specified condition.

Parameters

source	An T:System.Collections.Generic.IEnumerable`1 to return an element from.
predicate	A function to test each element for a condition.

Template Parameters

TSource The type of the elements of source .

Returns: The last element in the sequence that passes the test in the specified predicate function.

Exceptions

T:System.ArgumentNullException	source or predicate is `null`.
T:System.InvalidOperationException	No element satisfies the condition in predicate .-or-The source sequence is empty.

Definition at line 2730 of file Enumerable.cs.

◆ LastOrDefault< TSource >() [1/2]

static TSource System.Linq.Enumerable.LastOrDefault< TSource > ( this IEnumerable< TSource > source )

static

Returns the last element of a sequence, or a default value if the sequence contains no elements.

Parameters

source An T:System.Collections.Generic.IEnumerable`1 to return the last element of.

Template Parameters

TSource The type of the elements of source .

Returns: default(TSource ) if the source sequence is empty; otherwise, the last element in the T:System.Collections.Generic.IEnumerable`1.

Exceptions

T:System.ArgumentNullException source is null.

Definition at line 2765 of file Enumerable.cs.

◆ LastOrDefault< TSource >() [2/2]

static TSource System.Linq.Enumerable.LastOrDefault< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, bool >	predicate
	)

static

Returns the last element of a sequence that satisfies a condition or a default value if no such element is found.

Parameters

source	An T:System.Collections.Generic.IEnumerable`1 to return an element from.
predicate	A function to test each element for a condition.

Template Parameters

TSource The type of the elements of source .

Returns: default(TSource ) if the sequence is empty or if no elements pass the test in the predicate function; otherwise, the last element that passes the test in the predicate function.

Exceptions

T:System.ArgumentNullException source or predicate is null.

Definition at line 2808 of file Enumerable.cs.

◆ LongCount< TSource >() [1/2]

static long System.Linq.Enumerable.LongCount< TSource > ( this IEnumerable< TSource > source )

static

Returns an T:System.Int64 that represents the total number of elements in a sequence.

Parameters

source An T:System.Collections.Generic.IEnumerable`1 that contains the elements to be counted.

Template Parameters

TSource The type of the elements of source .

Returns: The number of elements in the source sequence.

Exceptions

T:System.ArgumentNullException	source is `null`.
T:System.OverflowException	The number of elements exceeds F:System.Int64.MaxValue.

Definition at line 3291 of file Enumerable.cs.

◆ LongCount< TSource >() [2/2]

static long System.Linq.Enumerable.LongCount< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, bool >	predicate
	)

static

Returns an T:System.Int64 that represents how many elements in a sequence satisfy a condition.

Parameters

source	An T:System.Collections.Generic.IEnumerable`1 that contains the elements to be counted.
predicate	A function to test each element for a condition.

Template Parameters

TSource The type of the elements of source .

Returns: A number that represents how many elements in the sequence satisfy the condition in the predicate function.

Exceptions

T:System.ArgumentNullException	source or predicate is `null`.
T:System.OverflowException	The number of matching elements exceeds F:System.Int64.MaxValue.

Definition at line 3317 of file Enumerable.cs.

◆ Max() [1/10]

static int System.Linq.Enumerable.Max ( this IEnumerable< int > source )

static

Returns the maximum value in a sequence of T:System.Int32 values.

Parameters

source A sequence of T:System.Int32 values to determine the maximum value of.

Returns: The maximum value in the sequence.

Exceptions

T:System.ArgumentNullException	source is `null`.
T:System.InvalidOperationException	source contains no elements.

Definition at line 4352 of file Enumerable.cs.

◆ Max() [2/10]

static ? int System.Linq.Enumerable.Max ( this IEnumerable< int?> source )

static

Returns the maximum value in a sequence of nullable T:System.Int32 values.

Parameters

source A sequence of nullable T:System.Int32 values to determine the maximum value of.

Returns: A value of type Nullable<Int32> in C# or Nullable(Of Int32) in Visual Basic that corresponds to the maximum value in the sequence.

Exceptions

T:System.ArgumentNullException source is null.

Definition at line 4388 of file Enumerable.cs.

◆ Max() [3/10]

static long System.Linq.Enumerable.Max ( this IEnumerable< long > source )

static

Returns the maximum value in a sequence of T:System.Int64 values.

Parameters

source A sequence of T:System.Int64 values to determine the maximum value of.

Returns: The maximum value in the sequence.

Exceptions

T:System.ArgumentNullException	source is `null`.
T:System.InvalidOperationException	source contains no elements.

Definition at line 4413 of file Enumerable.cs.

◆ Max() [4/10]

static ? long System.Linq.Enumerable.Max ( this IEnumerable< long?> source )

static

Returns the maximum value in a sequence of nullable T:System.Int64 values.

Parameters

source A sequence of nullable T:System.Int64 values to determine the maximum value of.

Returns: A value of type Nullable<Int64> in C# or Nullable(Of Int64) in Visual Basic that corresponds to the maximum value in the sequence.

Exceptions

T:System.ArgumentNullException source is null.

Definition at line 4449 of file Enumerable.cs.

◆ Max() [5/10]

static double System.Linq.Enumerable.Max ( this IEnumerable< double > source )

static

Returns the maximum value in a sequence of T:System.Double values.

Parameters

source A sequence of T:System.Double values to determine the maximum value of.

Returns: The maximum value in the sequence.

Exceptions

T:System.ArgumentNullException	source is `null`.
T:System.InvalidOperationException	source contains no elements.

Definition at line 4474 of file Enumerable.cs.

◆ Max() [6/10]

static ? double System.Linq.Enumerable.Max ( this IEnumerable< double?> source )

static

Returns the maximum value in a sequence of nullable T:System.Double values.

Parameters

source A sequence of nullable T:System.Double values to determine the maximum value of.

Returns: A value of type Nullable<Double> in C# or Nullable(Of Double) in Visual Basic that corresponds to the maximum value in the sequence.

Exceptions

T:System.ArgumentNullException source is null.

Definition at line 4510 of file Enumerable.cs.

◆ Max() [7/10]

static float System.Linq.Enumerable.Max ( this IEnumerable< float > source )

static

Returns the maximum value in a sequence of T:System.Single values.

Parameters

source A sequence of T:System.Single values to determine the maximum value of.

Returns: The maximum value in the sequence.

Exceptions

T:System.ArgumentNullException	source is `null`.
T:System.InvalidOperationException	source contains no elements.

Definition at line 4535 of file Enumerable.cs.

◆ Max() [8/10]

static ? float System.Linq.Enumerable.Max ( this IEnumerable< float?> source )

static

Returns the maximum value in a sequence of nullable T:System.Single values.

Parameters

source A sequence of nullable T:System.Single values to determine the maximum value of.

Returns: A value of type Nullable<Single> in C# or Nullable(Of Single) in Visual Basic that corresponds to the maximum value in the sequence.

Exceptions

T:System.ArgumentNullException source is null.

Definition at line 4571 of file Enumerable.cs.

◆ Max() [9/10]

static decimal System.Linq.Enumerable.Max ( this IEnumerable< decimal > source )

static

Returns the maximum value in a sequence of T:System.Decimal values.

Parameters

source A sequence of T:System.Decimal values to determine the maximum value of.

Returns: The maximum value in the sequence.

Exceptions

T:System.ArgumentNullException	source is `null`.
T:System.InvalidOperationException	source contains no elements.

Definition at line 4596 of file Enumerable.cs.

◆ Max() [10/10]

static ? decimal System.Linq.Enumerable.Max ( this IEnumerable< decimal?> source )

static

Returns the maximum value in a sequence of nullable T:System.Decimal values.

Parameters

source A sequence of nullable T:System.Decimal values to determine the maximum value of.

Returns: A value of type Nullable<Decimal> in C# or Nullable(Of Decimal) in Visual Basic that corresponds to the maximum value in the sequence.

Exceptions

T:System.ArgumentNullException source is null.

Definition at line 4632 of file Enumerable.cs.

◆ Max< TSource >() [1/11]

static TSource System.Linq.Enumerable.Max< TSource > ( this IEnumerable< TSource > source )

static

Returns the maximum value in a generic sequence.

Parameters

source A sequence of values to determine the maximum value of.

Template Parameters

TSource The type of the elements of source .

Returns: The maximum value in the sequence.

Exceptions

T:System.ArgumentNullException source is null.

Definition at line 4656 of file Enumerable.cs.

◆ Max< TSource >() [2/11]

static int System.Linq.Enumerable.Max< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, int >	selector
	)

static

Invokes a transform function on each element of a sequence and returns the maximum T:System.Int32 value.

Parameters

source	A sequence of values to determine the maximum value of.
selector	A transform function to apply to each element.

Template Parameters

TSource The type of the elements of source .

Returns: The maximum value in the sequence.

Exceptions

T:System.ArgumentNullException	source or selector is `null`.
T:System.InvalidOperationException	source contains no elements.

Definition at line 4708 of file Enumerable.cs.

◆ Max< TSource >() [3/11]

static ? int System.Linq.Enumerable.Max< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, int?>	selector
	)

static

Invokes a transform function on each element of a sequence and returns the maximum nullable T:System.Int32 value.

Parameters

source	A sequence of values to determine the maximum value of.
selector	A transform function to apply to each element.

Template Parameters

TSource The type of the elements of source .

Returns: The value of type Nullable<Int32> in C# or Nullable(Of Int32) in Visual Basic that corresponds to the maximum value in the sequence.

Exceptions

T:System.ArgumentNullException source or selector is null.

Definition at line 4721 of file Enumerable.cs.

◆ Max< TSource >() [4/11]

static long System.Linq.Enumerable.Max< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, long >	selector
	)

static

Invokes a transform function on each element of a sequence and returns the maximum T:System.Int64 value.

Parameters

source	A sequence of values to determine the maximum value of.
selector	A transform function to apply to each element.

Template Parameters

TSource The type of the elements of source .

Returns: The maximum value in the sequence.

Exceptions

T:System.ArgumentNullException	source or selector is `null`.
T:System.InvalidOperationException	source contains no elements.

Definition at line 4736 of file Enumerable.cs.

◆ Max< TSource >() [5/11]

static ? long System.Linq.Enumerable.Max< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, long?>	selector
	)

static

Invokes a transform function on each element of a sequence and returns the maximum nullable T:System.Int64 value.

Parameters

source	A sequence of values to determine the maximum value of.
selector	A transform function to apply to each element.

Template Parameters

TSource The type of the elements of source .

Returns: The value of type Nullable<Int64> in C# or Nullable(Of Int64) in Visual Basic that corresponds to the maximum value in the sequence.

Exceptions

T:System.ArgumentNullException source or selector is null.

Definition at line 4749 of file Enumerable.cs.

◆ Max< TSource >() [6/11]

static float System.Linq.Enumerable.Max< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, float >	selector
	)

static

Invokes a transform function on each element of a sequence and returns the maximum T:System.Single value.

Parameters

source	A sequence of values to determine the maximum value of.
selector	A transform function to apply to each element.

Template Parameters

TSource The type of the elements of source .

Returns: The maximum value in the sequence.

Exceptions

T:System.ArgumentNullException	source or selector is `null`.
T:System.InvalidOperationException	source contains no elements.

Definition at line 4764 of file Enumerable.cs.

◆ Max< TSource >() [7/11]

static ? float System.Linq.Enumerable.Max< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, float?>	selector
	)

static

Invokes a transform function on each element of a sequence and returns the maximum nullable T:System.Single value.

Parameters

source	A sequence of values to determine the maximum value of.
selector	A transform function to apply to each element.

Template Parameters

TSource The type of the elements of source .

Returns: The value of type Nullable<Single> in C# or Nullable(Of Single) in Visual Basic that corresponds to the maximum value in the sequence.

Exceptions

T:System.ArgumentNullException source or selector is null.

Definition at line 4777 of file Enumerable.cs.

◆ Max< TSource >() [8/11]

static double System.Linq.Enumerable.Max< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, double >	selector
	)

static

Invokes a transform function on each element of a sequence and returns the maximum T:System.Double value.

Parameters

source	A sequence of values to determine the maximum value of.
selector	A transform function to apply to each element.

Template Parameters

TSource The type of the elements of source .

Returns: The maximum value in the sequence.

Exceptions

T:System.ArgumentNullException	source or selector is `null`.
T:System.InvalidOperationException	source contains no elements.

Definition at line 4792 of file Enumerable.cs.

◆ Max< TSource >() [9/11]

static ? double System.Linq.Enumerable.Max< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, double?>	selector
	)

static

Invokes a transform function on each element of a sequence and returns the maximum nullable T:System.Double value.

Parameters

source	A sequence of values to determine the maximum value of.
selector	A transform function to apply to each element.

Template Parameters

TSource The type of the elements of source .

Returns: The value of type Nullable<Double> in C# or Nullable(Of Double) in Visual Basic that corresponds to the maximum value in the sequence.

Exceptions

T:System.ArgumentNullException source or selector is null.

Definition at line 4805 of file Enumerable.cs.

◆ Max< TSource >() [10/11]

static decimal System.Linq.Enumerable.Max< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, decimal >	selector
	)

static

Invokes a transform function on each element of a sequence and returns the maximum T:System.Decimal value.

Parameters

source	A sequence of values to determine the maximum value of.
selector	A transform function to apply to each element.

Template Parameters

TSource The type of the elements of source .

Returns: The maximum value in the sequence.

Exceptions

T:System.ArgumentNullException	source or selector is `null`.
T:System.InvalidOperationException	source contains no elements.

Definition at line 4820 of file Enumerable.cs.

◆ Max< TSource >() [11/11]

static ? decimal System.Linq.Enumerable.Max< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, decimal?>	selector
	)

static

Invokes a transform function on each element of a sequence and returns the maximum nullable T:System.Decimal value.

Parameters

source	A sequence of values to determine the maximum value of.
selector	A transform function to apply to each element.

Template Parameters

TSource The type of the elements of source .

Returns: The value of type Nullable<Decimal> in C# or Nullable(Of Decimal) in Visual Basic that corresponds to the maximum value in the sequence.

Exceptions

T:System.ArgumentNullException source or selector is null.

Definition at line 4833 of file Enumerable.cs.

◆ Max< TSource, TResult >()

static TResult System.Linq.Enumerable.Max< TSource, TResult >	(	this IEnumerable< TSource >	source,
		Func< TSource, TResult >	selector
	)

static

Invokes a transform function on each element of a generic sequence and returns the maximum resulting value.

Parameters

source	A sequence of values to determine the maximum value of.
selector	A transform function to apply to each element.

Template Parameters

TSource	The type of the elements of source .
TResult	The type of the value returned by selector .

Returns: The maximum value in the sequence.

Exceptions

T:System.ArgumentNullException source or selector is null.

Definition at line 4847 of file Enumerable.cs.

◆ Min() [1/10]

static int System.Linq.Enumerable.Min ( this IEnumerable< int > source )

static

Returns the minimum value in a sequence of T:System.Int32 values.

Parameters

source A sequence of T:System.Int32 values to determine the minimum value of.

Returns: The minimum value in the sequence.

Exceptions

T:System.ArgumentNullException	source is `null`.
T:System.InvalidOperationException	source contains no elements.

Definition at line 3844 of file Enumerable.cs.

◆ Min() [2/10]

static ? int System.Linq.Enumerable.Min ( this IEnumerable< int?> source )

static

Returns the minimum value in a sequence of nullable T:System.Int32 values.

Parameters

source A sequence of nullable T:System.Int32 values to determine the minimum value of.

Returns: A value of type Nullable<Int32> in C# or Nullable(Of Int32) in Visual Basic that corresponds to the minimum value in the sequence.

Exceptions

T:System.ArgumentNullException source is null.

Definition at line 3880 of file Enumerable.cs.

◆ Min() [3/10]

static long System.Linq.Enumerable.Min ( this IEnumerable< long > source )

static

Returns the minimum value in a sequence of T:System.Int64 values.

Parameters

source A sequence of T:System.Int64 values to determine the minimum value of.

Returns: The minimum value in the sequence.

Exceptions

T:System.ArgumentNullException	source is `null`.
T:System.InvalidOperationException	source contains no elements.

Definition at line 3905 of file Enumerable.cs.

◆ Min() [4/10]

static ? long System.Linq.Enumerable.Min ( this IEnumerable< long?> source )

static

Returns the minimum value in a sequence of nullable T:System.Int64 values.

Parameters

source A sequence of nullable T:System.Int64 values to determine the minimum value of.

Returns: A value of type Nullable<Int64> in C# or Nullable(Of Int64) in Visual Basic that corresponds to the minimum value in the sequence.

Exceptions

T:System.ArgumentNullException source is null.

Definition at line 3941 of file Enumerable.cs.

◆ Min() [5/10]

static float System.Linq.Enumerable.Min ( this IEnumerable< float > source )

static

Returns the minimum value in a sequence of T:System.Single values.

Parameters

source A sequence of T:System.Single values to determine the minimum value of.

Returns: The minimum value in the sequence.

Exceptions

T:System.ArgumentNullException	source is `null`.
T:System.InvalidOperationException	source contains no elements.

Definition at line 3966 of file Enumerable.cs.

◆ Min() [6/10]

static ? float System.Linq.Enumerable.Min ( this IEnumerable< float?> source )

static

Returns the minimum value in a sequence of nullable T:System.Single values.

Parameters

source A sequence of nullable T:System.Single values to determine the minimum value of.

Returns: A value of type Nullable<Single> in C# or Nullable(Of Single) in Visual Basic that corresponds to the minimum value in the sequence.

Exceptions

T:System.ArgumentNullException source is null.

Definition at line 4002 of file Enumerable.cs.

◆ Min() [7/10]

static double System.Linq.Enumerable.Min ( this IEnumerable< double > source )

static

Returns the minimum value in a sequence of T:System.Double values.

Parameters

source A sequence of T:System.Double values to determine the minimum value of.

Returns: The minimum value in the sequence.

Exceptions

T:System.ArgumentNullException	source is `null`.
T:System.InvalidOperationException	source contains no elements.

Definition at line 4027 of file Enumerable.cs.

◆ Min() [8/10]

static ? double System.Linq.Enumerable.Min ( this IEnumerable< double?> source )

static

Returns the minimum value in a sequence of nullable T:System.Double values.

Parameters

source A sequence of nullable T:System.Double values to determine the minimum value of.

Returns: A value of type Nullable<Double> in C# or Nullable(Of Double) in Visual Basic that corresponds to the minimum value in the sequence.

Exceptions

T:System.ArgumentNullException source is null.

Definition at line 4063 of file Enumerable.cs.

◆ Min() [9/10]

static decimal System.Linq.Enumerable.Min ( this IEnumerable< decimal > source )

static

Returns the minimum value in a sequence of T:System.Decimal values.

Parameters

source A sequence of T:System.Decimal values to determine the minimum value of.

Returns: The minimum value in the sequence.

Exceptions

T:System.ArgumentNullException	source is `null`.
T:System.InvalidOperationException	source contains no elements.

Definition at line 4088 of file Enumerable.cs.

◆ Min() [10/10]

static ? decimal System.Linq.Enumerable.Min ( this IEnumerable< decimal?> source )

static

Returns the minimum value in a sequence of nullable T:System.Decimal values.

Parameters

source A sequence of nullable T:System.Decimal values to determine the minimum value of.

Returns: A value of type Nullable<Decimal> in C# or Nullable(Of Decimal) in Visual Basic that corresponds to the minimum value in the sequence.

Exceptions

T:System.ArgumentNullException source is null.

Definition at line 4124 of file Enumerable.cs.

◆ Min< TSource >() [1/11]

static TSource System.Linq.Enumerable.Min< TSource > ( this IEnumerable< TSource > source )

static

Returns the minimum value in a generic sequence.

Parameters

source A sequence of values to determine the minimum value of.

Template Parameters

TSource The type of the elements of source .

Returns: The minimum value in the sequence.

Exceptions

T:System.ArgumentNullException source is null.

Definition at line 4148 of file Enumerable.cs.

◆ Min< TSource >() [2/11]

static int System.Linq.Enumerable.Min< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, int >	selector
	)

static

Invokes a transform function on each element of a sequence and returns the minimum T:System.Int32 value.

Parameters

source	A sequence of values to determine the minimum value of.
selector	A transform function to apply to each element.

Template Parameters

TSource The type of the elements of source .

Returns: The minimum value in the sequence.

Exceptions

T:System.ArgumentNullException	source or selector is `null`.
T:System.InvalidOperationException	source contains no elements.

Definition at line 4200 of file Enumerable.cs.

◆ Min< TSource >() [3/11]

static ? int System.Linq.Enumerable.Min< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, int?>	selector
	)

static

Invokes a transform function on each element of a sequence and returns the minimum nullable T:System.Int32 value.

Parameters

source	A sequence of values to determine the minimum value of.
selector	A transform function to apply to each element.

Template Parameters

TSource The type of the elements of source .

Returns: The value of type Nullable<Int32> in C# or Nullable(Of Int32) in Visual Basic that corresponds to the minimum value in the sequence.

Exceptions

T:System.ArgumentNullException source or selector is null.

Definition at line 4213 of file Enumerable.cs.

◆ Min< TSource >() [4/11]

static long System.Linq.Enumerable.Min< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, long >	selector
	)

static

Invokes a transform function on each element of a sequence and returns the minimum T:System.Int64 value.

Parameters

source	A sequence of values to determine the minimum value of.
selector	A transform function to apply to each element.

Template Parameters

TSource The type of the elements of source .

Returns: The minimum value in the sequence.

Exceptions

T:System.ArgumentNullException	source or selector is `null`.
T:System.InvalidOperationException	source contains no elements.

Definition at line 4228 of file Enumerable.cs.

◆ Min< TSource >() [5/11]

static ? long System.Linq.Enumerable.Min< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, long?>	selector
	)

static

Invokes a transform function on each element of a sequence and returns the minimum nullable T:System.Int64 value.

Parameters

source	A sequence of values to determine the minimum value of.
selector	A transform function to apply to each element.

Template Parameters

TSource The type of the elements of source .

Returns: The value of type Nullable<Int64> in C# or Nullable(Of Int64) in Visual Basic that corresponds to the minimum value in the sequence.

Exceptions

T:System.ArgumentNullException source or selector is null.

Definition at line 4241 of file Enumerable.cs.

◆ Min< TSource >() [6/11]

static float System.Linq.Enumerable.Min< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, float >	selector
	)

static

Invokes a transform function on each element of a sequence and returns the minimum T:System.Single value.

Parameters

source	A sequence of values to determine the minimum value of.
selector	A transform function to apply to each element.

Template Parameters

TSource The type of the elements of source .

Returns: The minimum value in the sequence.

Exceptions

T:System.ArgumentNullException	source or selector is `null`.
T:System.InvalidOperationException	source contains no elements.

Definition at line 4256 of file Enumerable.cs.

◆ Min< TSource >() [7/11]

static ? float System.Linq.Enumerable.Min< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, float?>	selector
	)

static

Invokes a transform function on each element of a sequence and returns the minimum nullable T:System.Single value.

Parameters

source	A sequence of values to determine the minimum value of.
selector	A transform function to apply to each element.

Template Parameters

TSource The type of the elements of source .

Returns: The value of type Nullable<Single> in C# or Nullable(Of Single) in Visual Basic that corresponds to the minimum value in the sequence.

Exceptions

T:System.ArgumentNullException source or selector is null.

Definition at line 4269 of file Enumerable.cs.

◆ Min< TSource >() [8/11]

static double System.Linq.Enumerable.Min< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, double >	selector
	)

static

Invokes a transform function on each element of a sequence and returns the minimum T:System.Double value.

Parameters

source	A sequence of values to determine the minimum value of.
selector	A transform function to apply to each element.

Template Parameters

TSource The type of the elements of source .

Returns: The minimum value in the sequence.

Exceptions

T:System.ArgumentNullException	source or selector is `null`.
T:System.InvalidOperationException	source contains no elements.

Definition at line 4284 of file Enumerable.cs.

◆ Min< TSource >() [9/11]

static ? double System.Linq.Enumerable.Min< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, double?>	selector
	)

static

Invokes a transform function on each element of a sequence and returns the minimum nullable T:System.Double value.

Parameters

source	A sequence of values to determine the minimum value of.
selector	A transform function to apply to each element.

Template Parameters

TSource The type of the elements of source .

Returns: The value of type Nullable<Double> in C# or Nullable(Of Double) in Visual Basic that corresponds to the minimum value in the sequence.

Exceptions

T:System.ArgumentNullException source or selector is null.

Definition at line 4297 of file Enumerable.cs.

◆ Min< TSource >() [10/11]

static decimal System.Linq.Enumerable.Min< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, decimal >	selector
	)

static

Invokes a transform function on each element of a sequence and returns the minimum T:System.Decimal value.

Parameters

source	A sequence of values to determine the minimum value of.
selector	A transform function to apply to each element.

Template Parameters

TSource The type of the elements of source .

Returns: The minimum value in the sequence.

Exceptions

T:System.ArgumentNullException	source or selector is `null`.
T:System.InvalidOperationException	source contains no elements.

Definition at line 4312 of file Enumerable.cs.

◆ Min< TSource >() [11/11]

static ? decimal System.Linq.Enumerable.Min< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, decimal?>	selector
	)

static

Invokes a transform function on each element of a sequence and returns the minimum nullable T:System.Decimal value.

Parameters

source	A sequence of values to determine the minimum value of.
selector	A transform function to apply to each element.

Template Parameters

TSource The type of the elements of source .

Returns: The value of type Nullable<Decimal> in C# or Nullable(Of Decimal) in Visual Basic that corresponds to the minimum value in the sequence.

Exceptions

T:System.ArgumentNullException source or selector is null.

Definition at line 4325 of file Enumerable.cs.

◆ Min< TSource, TResult >()

static TResult System.Linq.Enumerable.Min< TSource, TResult >	(	this IEnumerable< TSource >	source,
		Func< TSource, TResult >	selector
	)

static

Invokes a transform function on each element of a generic sequence and returns the minimum resulting value.

Parameters

source	A sequence of values to determine the minimum value of.
selector	A transform function to apply to each element.

Template Parameters

TSource	The type of the elements of source .
TResult	The type of the value returned by selector .

Returns: The minimum value in the sequence.

Exceptions

T:System.ArgumentNullException source or selector is null.

Definition at line 4339 of file Enumerable.cs.

◆ OfType< TResult >()

static IEnumerable<TResult> System.Linq.Enumerable.OfType< TResult > ( this IEnumerable source )

static

Filters the elements of an T:System.Collections.IEnumerable based on a specified type.

Parameters

source The T:System.Collections.IEnumerable whose elements to filter.

Template Parameters

TResult The type to filter the elements of the sequence on.

Returns: An T:System.Collections.Generic.IEnumerable`1 that contains elements from the input sequence of type TResult .

Exceptions

T:System.ArgumentNullException source is null.

Definition at line 2501 of file Enumerable.cs.

◆ OrderBy< TSource, TKey >() [1/2]

static IOrderedEnumerable<TSource> System.Linq.Enumerable.OrderBy< TSource, TKey >	(	this IEnumerable< TSource >	source,
		Func< TSource, TKey >	keySelector
	)

static

Sorts the elements of a sequence in ascending order according to a key.

Parameters

source	A sequence of values to order.
keySelector	A function to extract a key from an element.

Template Parameters

TSource	The type of the elements of source .
TKey	The type of the key returned by keySelector .

Returns: An T:System.Linq.IOrderedEnumerable`1 whose elements are sorted according to a key.

Exceptions

T:System.ArgumentNullException source or keySelector is null.

Definition at line 1623 of file Enumerable.cs.

◆ OrderBy< TSource, TKey >() [2/2]

static IOrderedEnumerable<TSource> System.Linq.Enumerable.OrderBy< TSource, TKey >	(	this IEnumerable< TSource >	source,
		Func< TSource, TKey >	keySelector,
		IComparer< TKey >	comparer
	)

static

Sorts the elements of a sequence in ascending order by using a specified comparer.

Parameters

source	A sequence of values to order.
keySelector	A function to extract a key from an element.
comparer	An T:System.Collections.Generic.IComparer`1 to compare keys.

Template Parameters

TSource	The type of the elements of source .
TKey	The type of the key returned by keySelector .

Returns: An T:System.Linq.IOrderedEnumerable`1 whose elements are sorted according to a key.

Exceptions

T:System.ArgumentNullException source or keySelector is null.

Definition at line 1638 of file Enumerable.cs.

◆ OrderByDescending< TSource, TKey >() [1/2]

static IOrderedEnumerable<TSource> System.Linq.Enumerable.OrderByDescending< TSource, TKey >	(	this IEnumerable< TSource >	source,
		Func< TSource, TKey >	keySelector
	)

static

Sorts the elements of a sequence in descending order according to a key.

Parameters

source	A sequence of values to order.
keySelector	A function to extract a key from an element.

Template Parameters

TSource	The type of the elements of source .
TKey	The type of the key returned by keySelector .

Returns: An T:System.Linq.IOrderedEnumerable`1 whose elements are sorted in descending order according to a key.

Exceptions

T:System.ArgumentNullException source or keySelector is null.

Definition at line 1652 of file Enumerable.cs.

◆ OrderByDescending< TSource, TKey >() [2/2]

static IOrderedEnumerable<TSource> System.Linq.Enumerable.OrderByDescending< TSource, TKey >	(	this IEnumerable< TSource >	source,
		Func< TSource, TKey >	keySelector,
		IComparer< TKey >	comparer
	)

static

Sorts the elements of a sequence in descending order by using a specified comparer.

Parameters

source	A sequence of values to order.
keySelector	A function to extract a key from an element.
comparer	An T:System.Collections.Generic.IComparer`1 to compare keys.

Template Parameters

TSource	The type of the elements of source .
TKey	The type of the key returned by keySelector .

Returns: An T:System.Linq.IOrderedEnumerable`1 whose elements are sorted in descending order according to a key.

Exceptions

T:System.ArgumentNullException source or keySelector is null.

Definition at line 1667 of file Enumerable.cs.

◆ Prepend< TSource >()

static IEnumerable<TSource> System.Linq.Enumerable.Prepend< TSource >	(	this IEnumerable< TSource >	source,
		TSource	element
	)

static

Adds a value to the beginning of the sequence.

Parameters

source	A sequence of values.
element	The value to prepend to source .

Template Parameters

TSource The type of the elements of source .

Returns: A new sequence that begins with element .

Exceptions

T:System.ArgumentNullException source is null.

Definition at line 5323 of file Enumerable.cs.

◆ Range()

static IEnumerable<int> System.Linq.Enumerable.Range	(	int	start,
		int	count
	)

static

Generates a sequence of integral numbers within a specified range.

Parameters

start	The value of the first integer in the sequence.
count	The number of sequential integers to generate.

Returns: An IEnumerable<Int32> in C# or IEnumerable(Of Int32) in Visual Basic that contains a range of sequential integral numbers.

Exceptions

T:System.ArgumentOutOfRangeException count is less than 0.-or- start + count -1 is larger than F:System.Int32.MaxValue.

Definition at line 3084 of file Enumerable.cs.

◆ Repeat< TResult >()

static IEnumerable<TResult> System.Linq.Enumerable.Repeat< TResult >	(	TResult	element,
		int	count
	)

static

Generates a sequence that contains one repeated value.

Parameters

element	The value to be repeated.
count	The number of times to repeat the value in the generated sequence.

Template Parameters

TResult The type of the value to be repeated in the result sequence.

Returns: An T:System.Collections.Generic.IEnumerable`1 that contains a repeated value.

Exceptions

T:System.ArgumentOutOfRangeException count is less than 0.

Definition at line 3110 of file Enumerable.cs.

◆ Reverse< TSource >()

static IEnumerable<TSource> System.Linq.Enumerable.Reverse< TSource > ( this IEnumerable< TSource > source )

static

Inverts the order of the elements in a sequence.

Parameters

source A sequence of values to reverse.

Template Parameters

TSource The type of the elements of source .

Returns: A sequence whose elements correspond to those of the input sequence in reverse order.

Exceptions

T:System.ArgumentNullException source is null.

Definition at line 2177 of file Enumerable.cs.

◆ Select< TSource, TResult >() [1/2]

static IEnumerable<TResult> System.Linq.Enumerable.Select< TSource, TResult >	(	this IEnumerable< TSource >	source,
		Func< TSource, TResult >	selector
	)

static

Projects each element of a sequence into a new form.

Parameters

source	A sequence of values to invoke a transform function on.
selector	A transform function to apply to each element.

Template Parameters

TSource	The type of the elements of source .
TResult	The type of the value returned by selector .

Returns: An T:System.Collections.Generic.IEnumerable`1 whose elements are the result of invoking the transform function on each element of source .

Exceptions

T:System.ArgumentNullException source or selector is null.

Definition at line 996 of file Enumerable.cs.

◆ Select< TSource, TResult >() [2/2]

static IEnumerable<TResult> System.Linq.Enumerable.Select< TSource, TResult >	(	this IEnumerable< TSource >	source,
		Func< TSource, int, TResult >	selector
	)

static

Projects each element of a sequence into a new form by incorporating the element's index.

Parameters

source	A sequence of values to invoke a transform function on.
selector	A transform function to apply to each source element; the second parameter of the function represents the index of the source element.

Template Parameters

TSource	The type of the elements of source .
TResult	The type of the value returned by selector .

Returns: An T:System.Collections.Generic.IEnumerable`1 whose elements are the result of invoking the transform function on each element of source .

Exceptions

T:System.ArgumentNullException source or selector is null.

Definition at line 1030 of file Enumerable.cs.

◆ SelectMany< TSource, TCollection, TResult >() [1/2]

static IEnumerable<TResult> System.Linq.Enumerable.SelectMany< TSource, TCollection, TResult >	(	this IEnumerable< TSource >	source,
		Func< TSource, int, IEnumerable< TCollection >>	collectionSelector,
		Func< TSource, TCollection, TResult >	resultSelector
	)

static

Projects each element of a sequence to an T:System.Collections.Generic.IEnumerable`1, flattens the resulting sequences into one sequence, and invokes a result selector function on each element therein. The index of each source element is used in the intermediate projected form of that element.

Parameters

source	A sequence of values to project.
collectionSelector	A transform function to apply to each source element; the second parameter of the function represents the index of the source element.
resultSelector	A transform function to apply to each element of the intermediate sequence.

Template Parameters

TSource	The type of the elements of source .
TCollection	The type of the intermediate elements collected by collectionSelector .
TResult	The type of the elements of the resulting sequence.

Returns: An T:System.Collections.Generic.IEnumerable`1 whose elements are the result of invoking the one-to-many transform function collectionSelector on each element of source and then mapping each of those sequence elements and their corresponding source element to a result element.

Exceptions

T:System.ArgumentNullException source or collectionSelector or resultSelector is null.

Definition at line 1149 of file Enumerable.cs.

◆ SelectMany< TSource, TCollection, TResult >() [2/2]

static IEnumerable<TResult> System.Linq.Enumerable.SelectMany< TSource, TCollection, TResult >	(	this IEnumerable< TSource >	source,
		Func< TSource, IEnumerable< TCollection >>	collectionSelector,
		Func< TSource, TCollection, TResult >	resultSelector
	)

static

Projects each element of a sequence to an T:System.Collections.Generic.IEnumerable`1, flattens the resulting sequences into one sequence, and invokes a result selector function on each element therein.

Parameters

source	A sequence of values to project.
collectionSelector	A transform function to apply to each element of the input sequence.
resultSelector	A transform function to apply to each element of the intermediate sequence.

Template Parameters

TSource	The type of the elements of source .
TCollection	The type of the intermediate elements collected by collectionSelector .
TResult	The type of the elements of the resulting sequence.

Returns: An T:System.Collections.Generic.IEnumerable`1 whose elements are the result of invoking the one-to-many transform function collectionSelector on each element of source and then mapping each of those sequence elements and their corresponding source element to a result element.

Exceptions

T:System.ArgumentNullException source or collectionSelector or resultSelector is null.

Definition at line 1190 of file Enumerable.cs.

◆ SelectMany< TSource, TResult >() [1/2]

static IEnumerable<TResult> System.Linq.Enumerable.SelectMany< TSource, TResult >	(	this IEnumerable< TSource >	source,
		Func< TSource, IEnumerable< TResult >>	selector
	)

static

Projects each element of a sequence to an T:System.Collections.Generic.IEnumerable`1 and flattens the resulting sequences into one sequence.

Parameters

source	A sequence of values to project.
selector	A transform function to apply to each element.

Template Parameters

TSource	The type of the elements of source .
TResult	The type of the elements of the sequence returned by selector .

Returns: An T:System.Collections.Generic.IEnumerable`1 whose elements are the result of invoking the one-to-many transform function on each element of the input sequence.

Exceptions

T:System.ArgumentNullException source or selector is null.

Definition at line 1079 of file Enumerable.cs.

◆ SelectMany< TSource, TResult >() [2/2]

static IEnumerable<TResult> System.Linq.Enumerable.SelectMany< TSource, TResult >	(	this IEnumerable< TSource >	source,
		Func< TSource, int, IEnumerable< TResult >>	selector
	)

static

Projects each element of a sequence to an T:System.Collections.Generic.IEnumerable`1, and flattens the resulting sequences into one sequence. The index of each source element is used in the projected form of that element.

Parameters

source	A sequence of values to project.
selector	A transform function to apply to each source element; the second parameter of the function represents the index of the source element.

Template Parameters

TSource	The type of the elements of source .
TResult	The type of the elements of the sequence returned by selector .

Returns: An T:System.Collections.Generic.IEnumerable`1 whose elements are the result of invoking the one-to-many transform function on each element of an input sequence.

Exceptions

T:System.ArgumentNullException source or selector is null.

Definition at line 1112 of file Enumerable.cs.

◆ SequenceEqual< TSource >() [1/2]

static bool System.Linq.Enumerable.SequenceEqual< TSource >	(	this IEnumerable< TSource >	first,
		IEnumerable< TSource >	second
	)

static

Determines whether two sequences are equal by comparing the elements by using the default equality comparer for their type.

Parameters

first	An T:System.Collections.Generic.IEnumerable`1 to compare to second .
second	An T:System.Collections.Generic.IEnumerable`1 to compare to the first sequence.

Template Parameters

TSource The type of the elements of the input sequences.

Returns: true if the two source sequences are of equal length and their corresponding elements are equal according to the default equality comparer for their type; otherwise, false.

Exceptions

T:System.ArgumentNullException first or second is null.

Definition at line 2204 of file Enumerable.cs.

◆ SequenceEqual< TSource >() [2/2]

static bool System.Linq.Enumerable.SequenceEqual< TSource >	(	this IEnumerable< TSource >	first,
		IEnumerable< TSource >	second,
		IEqualityComparer< TSource >	comparer
	)

static

Determines whether two sequences are equal by comparing their elements by using a specified T:System.Collections.Generic.IEqualityComparer`1.

Parameters

first	An T:System.Collections.Generic.IEnumerable`1 to compare to second .
second	An T:System.Collections.Generic.IEnumerable`1 to compare to the first sequence.
comparer	An T:System.Collections.Generic.IEqualityComparer`1 to use to compare elements.

Template Parameters

TSource The type of the elements of the input sequences.

Returns: true if the two source sequences are of equal length and their corresponding elements compare equal according to comparer ; otherwise, false.

Exceptions

T:System.ArgumentNullException first or second is null.

Definition at line 2219 of file Enumerable.cs.

◆ Single< TSource >() [1/2]

static TSource System.Linq.Enumerable.Single< TSource > ( this IEnumerable< TSource > source )

static

Returns the only element of a sequence, and throws an exception if there is not exactly one element in the sequence.

Parameters

source An T:System.Collections.Generic.IEnumerable`1 to return the single element of.

Template Parameters

TSource The type of the elements of source .

Returns: The single element of the input sequence.

Exceptions

T:System.ArgumentNullException	source is `null`.
T:System.InvalidOperationException	The input sequence contains more than one element.-or-The input sequence is empty.

Definition at line 2837 of file Enumerable.cs.

◆ Single< TSource >() [2/2]

static TSource System.Linq.Enumerable.Single< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, bool >	predicate
	)

static

Returns the only element of a sequence that satisfies a specified condition, and throws an exception if more than one such element exists.

Parameters

source	An T:System.Collections.Generic.IEnumerable`1 to return a single element from.
predicate	A function to test an element for a condition.

Template Parameters

TSource The type of the elements of source .

Returns: The single element of the input sequence that satisfies a condition.

Exceptions

T:System.ArgumentNullException	source or predicate is `null`.
T:System.InvalidOperationException	No element satisfies the condition in predicate .-or-More than one element satisfies the condition in predicate .-or-The source sequence is empty.

Definition at line 2881 of file Enumerable.cs.

◆ SingleOrDefault< TSource >() [1/2]

static TSource System.Linq.Enumerable.SingleOrDefault< TSource > ( this IEnumerable< TSource > source )

static

Returns the only element of a sequence, or a default value if the sequence is empty; this method throws an exception if there is more than one element in the sequence.

Parameters

source An T:System.Collections.Generic.IEnumerable`1 to return the single element of.

Template Parameters

TSource The type of the elements of source .

Returns: The single element of the input sequence, or default(TSource ) if the sequence contains no elements.

Exceptions

T:System.ArgumentNullException	source is `null`.
T:System.InvalidOperationException	The input sequence contains more than one element.

Definition at line 2920 of file Enumerable.cs.

◆ SingleOrDefault< TSource >() [2/2]

static TSource System.Linq.Enumerable.SingleOrDefault< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, bool >	predicate
	)

static

Returns the only element of a sequence that satisfies a specified condition or a default value if no such element exists; this method throws an exception if more than one element satisfies the condition.

Parameters

source	An T:System.Collections.Generic.IEnumerable`1 to return a single element from.
predicate	A function to test an element for a condition.

Template Parameters

TSource The type of the elements of source .

Returns: The single element of the input sequence that satisfies the condition, or default(TSource ) if no such element is found.

Exceptions

T:System.ArgumentNullException source or predicate is null.

Definition at line 2963 of file Enumerable.cs.

◆ Skip< TSource >()

static IEnumerable<TSource> System.Linq.Enumerable.Skip< TSource >	(	this IEnumerable< TSource >	source,
		int	count
	)

static

Bypasses a specified number of elements in a sequence and then returns the remaining elements.

Parameters

source	An T:System.Collections.Generic.IEnumerable`1 to return elements from.
count	The number of elements to skip before returning the remaining elements.

Template Parameters

TSource The type of the elements of source .

Returns: An T:System.Collections.Generic.IEnumerable`1 that contains the elements that occur after the specified index in the input sequence.

Exceptions

T:System.ArgumentNullException source is null.

Definition at line 1328 of file Enumerable.cs.

◆ SkipWhile< TSource >() [1/2]

static IEnumerable<TSource> System.Linq.Enumerable.SkipWhile< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, bool >	predicate
	)

static

Bypasses elements in a sequence as long as a specified condition is true and then returns the remaining elements.

Parameters

source	An T:System.Collections.Generic.IEnumerable`1 to return elements from.
predicate	A function to test each element for a condition.

Template Parameters

TSource The type of the elements of source .

Returns: An T:System.Collections.Generic.IEnumerable`1 that contains the elements from the input sequence starting at the first element in the linear series that does not pass the test specified by predicate .

Exceptions

T:System.ArgumentNullException source or predicate is null.

Definition at line 1363 of file Enumerable.cs.

◆ SkipWhile< TSource >() [2/2]

static IEnumerable<TSource> System.Linq.Enumerable.SkipWhile< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, int, bool >	predicate
	)

static

Bypasses elements in a sequence as long as a specified condition is true and then returns the remaining elements. The element's index is used in the logic of the predicate function.

Parameters

source	An T:System.Collections.Generic.IEnumerable`1 to return elements from.
predicate	A function to test each source element for a condition; the second parameter of the function represents the index of the source element.

Template Parameters

TSource The type of the elements of source .

Returns: An T:System.Collections.Generic.IEnumerable`1 that contains the elements from the input sequence starting at the first element in the linear series that does not pass the test specified by predicate .

Exceptions

T:System.ArgumentNullException source or predicate is null.

Definition at line 1400 of file Enumerable.cs.

◆ Sum() [1/10]

static int System.Linq.Enumerable.Sum ( this IEnumerable< int > source )

static

Computes the sum of a sequence of T:System.Int32 values.

Parameters

source A sequence of T:System.Int32 values to calculate the sum of.

Returns: The sum of the values in the sequence.

Exceptions

T:System.ArgumentNullException	source is `null`.
T:System.OverflowException	The sum is larger than F:System.Int32.MaxValue.

Definition at line 3486 of file Enumerable.cs.

◆ Sum() [2/10]

static ? int System.Linq.Enumerable.Sum ( this IEnumerable< int?> source )

static

Computes the sum of a sequence of nullable T:System.Int32 values.

Parameters

source A sequence of nullable T:System.Int32 values to calculate the sum of.

Returns: The sum of the values in the sequence.

Exceptions

T:System.ArgumentNullException	source is `null`.
T:System.OverflowException	The sum is larger than F:System.Int32.MaxValue.

Definition at line 3507 of file Enumerable.cs.

◆ Sum() [3/10]

static long System.Linq.Enumerable.Sum ( this IEnumerable< long > source )

static

Computes the sum of a sequence of T:System.Int64 values.

Parameters

source A sequence of T:System.Int64 values to calculate the sum of.

Returns: The sum of the values in the sequence.

Exceptions

T:System.ArgumentNullException	source is `null`.
T:System.OverflowException	The sum is larger than F:System.Int64.MaxValue.

Definition at line 3531 of file Enumerable.cs.

◆ Sum() [4/10]

static ? long System.Linq.Enumerable.Sum ( this IEnumerable< long?> source )

static

Computes the sum of a sequence of nullable T:System.Int64 values.

Parameters

source A sequence of nullable T:System.Int64 values to calculate the sum of.

Returns: The sum of the values in the sequence.

Exceptions

T:System.ArgumentNullException	source is `null`.
T:System.OverflowException	The sum is larger than F:System.Int64.MaxValue.

Definition at line 3552 of file Enumerable.cs.

◆ Sum() [5/10]

static float System.Linq.Enumerable.Sum ( this IEnumerable< float > source )

static

Computes the sum of a sequence of T:System.Single values.

Parameters

source A sequence of T:System.Single values to calculate the sum of.

Returns: The sum of the values in the sequence.

Exceptions

T:System.ArgumentNullException source is null.

Definition at line 3575 of file Enumerable.cs.

◆ Sum() [6/10]

static ? float System.Linq.Enumerable.Sum ( this IEnumerable< float?> source )

static

Computes the sum of a sequence of nullable T:System.Single values.

Parameters

source A sequence of nullable T:System.Single values to calculate the sum of.

Returns: The sum of the values in the sequence.

Exceptions

T:System.ArgumentNullException source is null.

Definition at line 3595 of file Enumerable.cs.

◆ Sum() [7/10]

static double System.Linq.Enumerable.Sum ( this IEnumerable< double > source )

static

Computes the sum of a sequence of T:System.Double values.

Parameters

source A sequence of T:System.Double values to calculate the sum of.

Returns: The sum of the values in the sequence.

Exceptions

T:System.ArgumentNullException source is null.

Definition at line 3618 of file Enumerable.cs.

◆ Sum() [8/10]

static ? double System.Linq.Enumerable.Sum ( this IEnumerable< double?> source )

static

Computes the sum of a sequence of nullable T:System.Double values.

Parameters

source A sequence of nullable T:System.Double values to calculate the sum of.

Returns: The sum of the values in the sequence.

Exceptions

T:System.ArgumentNullException source is null.

Definition at line 3638 of file Enumerable.cs.

◆ Sum() [9/10]

static decimal System.Linq.Enumerable.Sum ( this IEnumerable< decimal > source )

static

Computes the sum of a sequence of T:System.Decimal values.

Parameters

source A sequence of T:System.Decimal values to calculate the sum of.

Returns: The sum of the values in the sequence.

Exceptions

T:System.ArgumentNullException	source is `null`.
T:System.OverflowException	The sum is larger than F:System.Decimal.MaxValue.

Definition at line 3662 of file Enumerable.cs.

◆ Sum() [10/10]

static ? decimal System.Linq.Enumerable.Sum ( this IEnumerable< decimal?> source )

static

Computes the sum of a sequence of nullable T:System.Decimal values.

Parameters

source A sequence of nullable T:System.Decimal values to calculate the sum of.

Returns: The sum of the values in the sequence.

Exceptions

T:System.ArgumentNullException	source is `null`.
T:System.OverflowException	The sum is larger than F:System.Decimal.MaxValue.

Definition at line 3683 of file Enumerable.cs.

◆ Sum< TSource >() [1/10]

static int System.Linq.Enumerable.Sum< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, int >	selector
	)

static

Computes the sum of the sequence of T:System.Int32 values that are obtained by invoking a transform function on each element of the input sequence.

Parameters

source	A sequence of values that are used to calculate a sum.
selector	A transform function to apply to each element.

Template Parameters

TSource The type of the elements of source .

Returns: The sum of the projected values.

Exceptions

T:System.ArgumentNullException	source or selector is `null`.
T:System.OverflowException	The sum is larger than F:System.Int32.MaxValue.

Definition at line 3709 of file Enumerable.cs.

◆ Sum< TSource >() [2/10]

static ? int System.Linq.Enumerable.Sum< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, int?>	selector
	)

static

Computes the sum of the sequence of nullable T:System.Int32 values that are obtained by invoking a transform function on each element of the input sequence.

Parameters

source	A sequence of values that are used to calculate a sum.
selector	A transform function to apply to each element.

Template Parameters

TSource The type of the elements of source .

Returns: The sum of the projected values.

Exceptions

T:System.ArgumentNullException	source or selector is `null`.
T:System.OverflowException	The sum is larger than F:System.Int32.MaxValue.

Definition at line 3723 of file Enumerable.cs.

◆ Sum< TSource >() [3/10]

static long System.Linq.Enumerable.Sum< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, long >	selector
	)

static

Computes the sum of the sequence of T:System.Int64 values that are obtained by invoking a transform function on each element of the input sequence.

Parameters

source	A sequence of values that are used to calculate a sum.
selector	A transform function to apply to each element.

Template Parameters

TSource The type of the elements of source .

Returns: The sum of the projected values.

Exceptions

T:System.ArgumentNullException	source or selector is `null`.
T:System.OverflowException	The sum is larger than F:System.Int64.MaxValue.

Definition at line 3737 of file Enumerable.cs.

◆ Sum< TSource >() [4/10]

static ? long System.Linq.Enumerable.Sum< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, long?>	selector
	)

static

Computes the sum of the sequence of nullable T:System.Int64 values that are obtained by invoking a transform function on each element of the input sequence.

Parameters

source	A sequence of values that are used to calculate a sum.
selector	A transform function to apply to each element.

Template Parameters

TSource The type of the elements of source .

Returns: The sum of the projected values.

Exceptions

T:System.ArgumentNullException	source or selector is `null`.
T:System.OverflowException	The sum is larger than F:System.Int64.MaxValue.

Definition at line 3751 of file Enumerable.cs.

◆ Sum< TSource >() [5/10]

static float System.Linq.Enumerable.Sum< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, float >	selector
	)

static

Computes the sum of the sequence of T:System.Single values that are obtained by invoking a transform function on each element of the input sequence.

Parameters

source	A sequence of values that are used to calculate a sum.
selector	A transform function to apply to each element.

Template Parameters

TSource The type of the elements of source .

Returns: The sum of the projected values.

Exceptions

T:System.ArgumentNullException source or selector is null.

Definition at line 3764 of file Enumerable.cs.

◆ Sum< TSource >() [6/10]

static ? float System.Linq.Enumerable.Sum< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, float?>	selector
	)

static

Computes the sum of the sequence of nullable T:System.Single values that are obtained by invoking a transform function on each element of the input sequence.

Parameters

source	A sequence of values that are used to calculate a sum.
selector	A transform function to apply to each element.

Template Parameters

TSource The type of the elements of source .

Returns: The sum of the projected values.

Exceptions

T:System.ArgumentNullException source or selector is null.

Definition at line 3777 of file Enumerable.cs.

◆ Sum< TSource >() [7/10]

static double System.Linq.Enumerable.Sum< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, double >	selector
	)

static

Computes the sum of the sequence of T:System.Double values that are obtained by invoking a transform function on each element of the input sequence.

Parameters

source	A sequence of values that are used to calculate a sum.
selector	A transform function to apply to each element.

Template Parameters

TSource The type of the elements of source .

Returns: The sum of the projected values.

Exceptions

T:System.ArgumentNullException source or selector is null.

Definition at line 3790 of file Enumerable.cs.

◆ Sum< TSource >() [8/10]

static ? double System.Linq.Enumerable.Sum< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, double?>	selector
	)

static

Computes the sum of the sequence of nullable T:System.Double values that are obtained by invoking a transform function on each element of the input sequence.

Parameters

source	A sequence of values that are used to calculate a sum.
selector	A transform function to apply to each element.

Template Parameters

TSource The type of the elements of source .

Returns: The sum of the projected values.

Exceptions

T:System.ArgumentNullException source or selector is null.

Definition at line 3803 of file Enumerable.cs.

◆ Sum< TSource >() [9/10]

static decimal System.Linq.Enumerable.Sum< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, decimal >	selector
	)

static

Computes the sum of the sequence of T:System.Decimal values that are obtained by invoking a transform function on each element of the input sequence.

Parameters

source	A sequence of values that are used to calculate a sum.
selector	A transform function to apply to each element.

Template Parameters

TSource The type of the elements of source .

Returns: The sum of the projected values.

Exceptions

T:System.ArgumentNullException	source or selector is `null`.
T:System.OverflowException	The sum is larger than F:System.Decimal.MaxValue.

Definition at line 3817 of file Enumerable.cs.

◆ Sum< TSource >() [10/10]

static ? decimal System.Linq.Enumerable.Sum< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, decimal?>	selector
	)

static

Computes the sum of the sequence of nullable T:System.Decimal values that are obtained by invoking a transform function on each element of the input sequence.

Parameters

source	A sequence of values that are used to calculate a sum.
selector	A transform function to apply to each element.

Template Parameters

TSource The type of the elements of source .

Returns: The sum of the projected values.

Exceptions

T:System.ArgumentNullException	source or selector is `null`.
T:System.OverflowException	The sum is larger than F:System.Decimal.MaxValue.

Definition at line 3831 of file Enumerable.cs.

◆ Take< TSource >()

static IEnumerable<TSource> System.Linq.Enumerable.Take< TSource >	(	this IEnumerable< TSource >	source,
		int	count
	)

static

Returns a specified number of contiguous elements from the start of a sequence.

Parameters

source	The sequence to return elements from.
count	The number of elements to return.

Template Parameters

TSource The type of the elements of source .

Returns: An T:System.Collections.Generic.IEnumerable`1 that contains the specified number of elements from the start of the input sequence.

Exceptions

T:System.ArgumentNullException source is null.

Definition at line 1226 of file Enumerable.cs.

◆ TakeWhile< TSource >() [1/2]

static IEnumerable<TSource> System.Linq.Enumerable.TakeWhile< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, bool >	predicate
	)

static

Returns elements from a sequence as long as a specified condition is true.

Parameters

source	A sequence to return elements from.
predicate	A function to test each element for a condition.

Template Parameters

TSource The type of the elements of source .

Returns: An T:System.Collections.Generic.IEnumerable`1 that contains the elements from the input sequence that occur before the element at which the test no longer passes.

Exceptions

T:System.ArgumentNullException source or predicate is null.

Definition at line 1260 of file Enumerable.cs.

◆ TakeWhile< TSource >() [2/2]

static IEnumerable<TSource> System.Linq.Enumerable.TakeWhile< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, int, bool >	predicate
	)

static

Returns elements from a sequence as long as a specified condition is true. The element's index is used in the logic of the predicate function.

Parameters

source	The sequence to return elements from.
predicate	A function to test each source element for a condition; the second parameter of the function represents the index of the source element.

Template Parameters

TSource The type of the elements of source .

Returns: An T:System.Collections.Generic.IEnumerable`1 that contains elements from the input sequence that occur before the element at which the test no longer passes.

Exceptions

T:System.ArgumentNullException source or predicate is null.

Definition at line 1293 of file Enumerable.cs.

◆ ThenBy< TSource, TKey >() [1/2]

static IOrderedEnumerable<TSource> System.Linq.Enumerable.ThenBy< TSource, TKey >	(	this IOrderedEnumerable< TSource >	source,
		Func< TSource, TKey >	keySelector
	)

static

Performs a subsequent ordering of the elements in a sequence in ascending order according to a key.

Parameters

source	An T:System.Linq.IOrderedEnumerable`1 that contains elements to sort.
keySelector	A function to extract a key from each element.

Template Parameters

TSource	The type of the elements of source .
TKey	The type of the key returned by keySelector .

Returns: An T:System.Linq.IOrderedEnumerable`1 whose elements are sorted according to a key.

Exceptions

T:System.ArgumentNullException source or keySelector is null.

Definition at line 1681 of file Enumerable.cs.

◆ ThenBy< TSource, TKey >() [2/2]

static IOrderedEnumerable<TSource> System.Linq.Enumerable.ThenBy< TSource, TKey >	(	this IOrderedEnumerable< TSource >	source,
		Func< TSource, TKey >	keySelector,
		IComparer< TKey >	comparer
	)

static

Performs a subsequent ordering of the elements in a sequence in ascending order by using a specified comparer.

Parameters

source	An T:System.Linq.IOrderedEnumerable`1 that contains elements to sort.
keySelector	A function to extract a key from each element.
comparer	An T:System.Collections.Generic.IComparer`1 to compare keys.

Template Parameters

TSource	The type of the elements of source .
TKey	The type of the key returned by keySelector .

Returns: An T:System.Linq.IOrderedEnumerable`1 whose elements are sorted according to a key.

Exceptions

T:System.ArgumentNullException source or keySelector is null.

Definition at line 1700 of file Enumerable.cs.

◆ ThenByDescending< TSource, TKey >() [1/2]

static IOrderedEnumerable<TSource> System.Linq.Enumerable.ThenByDescending< TSource, TKey >	(	this IOrderedEnumerable< TSource >	source,
		Func< TSource, TKey >	keySelector
	)

static

Performs a subsequent ordering of the elements in a sequence in descending order, according to a key.

Parameters

source	An T:System.Linq.IOrderedEnumerable`1 that contains elements to sort.
keySelector	A function to extract a key from each element.

Template Parameters

TSource	The type of the elements of source .
TKey	The type of the key returned by keySelector .

Returns: An T:System.Linq.IOrderedEnumerable`1 whose elements are sorted in descending order according to a key.

Exceptions

T:System.ArgumentNullException source or keySelector is null.

Definition at line 1718 of file Enumerable.cs.

◆ ThenByDescending< TSource, TKey >() [2/2]

static IOrderedEnumerable<TSource> System.Linq.Enumerable.ThenByDescending< TSource, TKey >	(	this IOrderedEnumerable< TSource >	source,
		Func< TSource, TKey >	keySelector,
		IComparer< TKey >	comparer
	)

static

Performs a subsequent ordering of the elements in a sequence in descending order by using a specified comparer.

Parameters

source	An T:System.Linq.IOrderedEnumerable`1 that contains elements to sort.
keySelector	A function to extract a key from each element.
comparer	An T:System.Collections.Generic.IComparer`1 to compare keys.

Template Parameters

TSource	The type of the elements of source .
TKey	The type of the key returned by keySelector .

Returns: An T:System.Linq.IOrderedEnumerable`1 whose elements are sorted in descending order according to a key.

Exceptions

T:System.ArgumentNullException source or keySelector is null.

Definition at line 1737 of file Enumerable.cs.

◆ ToArray< TSource >()

static TSource [] System.Linq.Enumerable.ToArray< TSource > ( this IEnumerable< TSource > source )

static

Creates an array from a T:System.Collections.Generic.IEnumerable`1.

Parameters

source An T:System.Collections.Generic.IEnumerable`1 to create an array from.

Template Parameters

TSource The type of the elements of source .

Returns: An array that contains the elements from the input sequence.

Exceptions

T:System.ArgumentNullException source is null.

Definition at line 2270 of file Enumerable.cs.

◆ ToDictionary< TSource, TKey >() [1/2]

static Dictionary<TKey, TSource> System.Linq.Enumerable.ToDictionary< TSource, TKey >	(	this IEnumerable< TSource >	source,
		Func< TSource, TKey >	keySelector
	)

static

Creates a T:System.Collections.Generic.Dictionary`2 from an T:System.Collections.Generic.IEnumerable`1 according to a specified key selector function.

Parameters

source	An T:System.Collections.Generic.IEnumerable`1 to create a T:System.Collections.Generic.Dictionary`2 from.
keySelector	A function to extract a key from each element.

Template Parameters

TSource	The type of the elements of source .
TKey	The type of the key returned by keySelector .

Returns: A T:System.Collections.Generic.Dictionary`2 that contains keys and values.

Exceptions

T:System.ArgumentNullException	source or keySelector is `null`.-or- keySelector produces a key that is `null`.
T:System.ArgumentException	keySelector produces duplicate keys for two elements.

Definition at line 2307 of file Enumerable.cs.

◆ ToDictionary< TSource, TKey >() [2/2]

static Dictionary<TKey, TSource> System.Linq.Enumerable.ToDictionary< TSource, TKey >	(	this IEnumerable< TSource >	source,
		Func< TSource, TKey >	keySelector,
		IEqualityComparer< TKey >	comparer
	)

static

Creates a T:System.Collections.Generic.Dictionary`2 from an T:System.Collections.Generic.IEnumerable`1 according to a specified key selector function and key comparer.

Parameters

source	An T:System.Collections.Generic.IEnumerable`1 to create a T:System.Collections.Generic.Dictionary`2 from.
keySelector	A function to extract a key from each element.
comparer	An T:System.Collections.Generic.IEqualityComparer`1 to compare keys.

Template Parameters

TSource	The type of the elements of source .
TKey	The type of the keys returned by keySelector .

Returns: A T:System.Collections.Generic.Dictionary`2 that contains keys and values.

Exceptions

T:System.ArgumentNullException	source or keySelector is `null`.-or- keySelector produces a key that is `null`.
T:System.ArgumentException	keySelector produces duplicate keys for two elements.

Definition at line 2325 of file Enumerable.cs.

◆ ToDictionary< TSource, TKey, TElement >() [1/2]

static Dictionary<TKey, TElement> System.Linq.Enumerable.ToDictionary< TSource, TKey, TElement >	(	this IEnumerable< TSource >	source,
		Func< TSource, TKey >	keySelector,
		Func< TSource, TElement >	elementSelector
	)

static

Creates a T:System.Collections.Generic.Dictionary`2 from an T:System.Collections.Generic.IEnumerable`1 according to specified key selector and element selector functions.

Parameters

source	An T:System.Collections.Generic.IEnumerable`1 to create a T:System.Collections.Generic.Dictionary`2 from.
keySelector	A function to extract a key from each element.
elementSelector	A transform function to produce a result element value from each element.

Template Parameters

TSource	The type of the elements of source .
TKey	The type of the key returned by keySelector .
TElement	The type of the value returned by elementSelector .

Returns: A T:System.Collections.Generic.Dictionary`2 that contains values of type TElement selected from the input sequence.

Exceptions

T:System.ArgumentNullException	source or keySelector or elementSelector is `null`.-or- keySelector produces a key that is `null`.
T:System.ArgumentException	keySelector produces duplicate keys for two elements.

Definition at line 2344 of file Enumerable.cs.

◆ ToDictionary< TSource, TKey, TElement >() [2/2]

static Dictionary<TKey, TElement> System.Linq.Enumerable.ToDictionary< TSource, TKey, TElement >	(	this IEnumerable< TSource >	source,
		Func< TSource, TKey >	keySelector,
		Func< TSource, TElement >	elementSelector,
		IEqualityComparer< TKey >	comparer
	)

static

Creates a T:System.Collections.Generic.Dictionary`2 from an T:System.Collections.Generic.IEnumerable`1 according to a specified key selector function, a comparer, and an element selector function.

Parameters

source	An T:System.Collections.Generic.IEnumerable`1 to create a T:System.Collections.Generic.Dictionary`2 from.
keySelector	A function to extract a key from each element.
elementSelector	A transform function to produce a result element value from each element.
comparer	An T:System.Collections.Generic.IEqualityComparer`1 to compare keys.

Template Parameters

TSource	The type of the elements of source .
TKey	The type of the key returned by keySelector .
TElement	The type of the value returned by elementSelector .

Returns: A T:System.Collections.Generic.Dictionary`2 that contains values of type TElement selected from the input sequence.

Exceptions

T:System.ArgumentNullException	source or keySelector or elementSelector is `null`.-or- keySelector produces a key that is `null`.
T:System.ArgumentException	keySelector produces duplicate keys for two elements.

Definition at line 2364 of file Enumerable.cs.

◆ ToList< TSource >()

static List<TSource> System.Linq.Enumerable.ToList< TSource > ( this IEnumerable< TSource > source )

static

Creates a T:System.Collections.Generic.List`1 from an T:System.Collections.Generic.IEnumerable`1.

Parameters

source The T:System.Collections.Generic.IEnumerable`1 to create a T:System.Collections.Generic.List`1 from.

Template Parameters

TSource The type of the elements of source .

Returns: A T:System.Collections.Generic.List`1 that contains elements from the input sequence.

Exceptions

T:System.ArgumentNullException source is null.

Definition at line 2286 of file Enumerable.cs.

◆ ToLookup< TSource, TKey >() [1/2]

static ILookup<TKey, TSource> System.Linq.Enumerable.ToLookup< TSource, TKey >	(	this IEnumerable< TSource >	source,
		Func< TSource, TKey >	keySelector
	)

static

Creates a T:System.Linq.Lookup`2 from an T:System.Collections.Generic.IEnumerable`1 according to a specified key selector function.

Parameters

source	The T:System.Collections.Generic.IEnumerable`1 to create a T:System.Linq.Lookup`2 from.
keySelector	A function to extract a key from each element.

Template Parameters

TSource	The type of the elements of source .
TKey	The type of the key returned by keySelector .

Returns: A T:System.Linq.Lookup`2 that contains keys and values.

Exceptions

T:System.ArgumentNullException source or keySelector is null.

Definition at line 2395 of file Enumerable.cs.

◆ ToLookup< TSource, TKey >() [2/2]

static ILookup<TKey, TSource> System.Linq.Enumerable.ToLookup< TSource, TKey >	(	this IEnumerable< TSource >	source,
		Func< TSource, TKey >	keySelector,
		IEqualityComparer< TKey >	comparer
	)

static

Creates a T:System.Linq.Lookup`2 from an T:System.Collections.Generic.IEnumerable`1 according to a specified key selector function and key comparer.

Parameters

source	The T:System.Collections.Generic.IEnumerable`1 to create a T:System.Linq.Lookup`2 from.
keySelector	A function to extract a key from each element.
comparer	An T:System.Collections.Generic.IEqualityComparer`1 to compare keys.

Template Parameters

TSource	The type of the elements of source .
TKey	The type of the key returned by keySelector .

Returns: A T:System.Linq.Lookup`2 that contains keys and values.

Exceptions

T:System.ArgumentNullException source or keySelector is null.

Definition at line 2410 of file Enumerable.cs.

◆ ToLookup< TSource, TKey, TElement >() [1/2]

static ILookup<TKey, TElement> System.Linq.Enumerable.ToLookup< TSource, TKey, TElement >	(	this IEnumerable< TSource >	source,
		Func< TSource, TKey >	keySelector,
		Func< TSource, TElement >	elementSelector
	)

static

Creates a T:System.Linq.Lookup`2 from an T:System.Collections.Generic.IEnumerable`1 according to specified key selector and element selector functions.

Parameters

source	The T:System.Collections.Generic.IEnumerable`1 to create a T:System.Linq.Lookup`2 from.
keySelector	A function to extract a key from each element.
elementSelector	A transform function to produce a result element value from each element.

Template Parameters

TSource	The type of the elements of source .
TKey	The type of the key returned by keySelector .
TElement	The type of the value returned by elementSelector .

Returns: A T:System.Linq.Lookup`2 that contains values of type TElement selected from the input sequence.

Exceptions

T:System.ArgumentNullException source or keySelector or elementSelector is null.

Definition at line 2426 of file Enumerable.cs.

◆ ToLookup< TSource, TKey, TElement >() [2/2]

static ILookup<TKey, TElement> System.Linq.Enumerable.ToLookup< TSource, TKey, TElement >	(	this IEnumerable< TSource >	source,
		Func< TSource, TKey >	keySelector,
		Func< TSource, TElement >	elementSelector,
		IEqualityComparer< TKey >	comparer
	)

static

Creates a T:System.Linq.Lookup`2 from an T:System.Collections.Generic.IEnumerable`1 according to a specified key selector function, a comparer and an element selector function.

Parameters

source	The T:System.Collections.Generic.IEnumerable`1 to create a T:System.Linq.Lookup`2 from.
keySelector	A function to extract a key from each element.
elementSelector	A transform function to produce a result element value from each element.
comparer	An T:System.Collections.Generic.IEqualityComparer`1 to compare keys.

Template Parameters

TSource	The type of the elements of source .
TKey	The type of the key returned by keySelector .
TElement	The type of the value returned by elementSelector .

Returns: A T:System.Linq.Lookup`2 that contains values of type TElement selected from the input sequence.

Exceptions

T:System.ArgumentNullException source or keySelector or elementSelector is null.

Definition at line 2443 of file Enumerable.cs.

◆ Union< TSource >() [1/2]

static IEnumerable<TSource> System.Linq.Enumerable.Union< TSource >	(	this IEnumerable< TSource >	first,
		IEnumerable< TSource >	second
	)

static

Produces the set union of two sequences by using the default equality comparer.

Parameters

first	An T:System.Collections.Generic.IEnumerable`1 whose distinct elements form the first set for the union.
second	An T:System.Collections.Generic.IEnumerable`1 whose distinct elements form the second set for the union.

Template Parameters

TSource The type of the elements of the input sequences.

Returns: An T:System.Collections.Generic.IEnumerable`1 that contains the elements from both input sequences, excluding duplicates.

Exceptions

T:System.ArgumentNullException first or second is null.

Definition at line 1998 of file Enumerable.cs.

◆ Union< TSource >() [2/2]

static IEnumerable<TSource> System.Linq.Enumerable.Union< TSource >	(	this IEnumerable< TSource >	first,
		IEnumerable< TSource >	second,
		IEqualityComparer< TSource >	comparer
	)

static

Produces the set union of two sequences by using a specified T:System.Collections.Generic.IEqualityComparer`1.

Parameters

first	An T:System.Collections.Generic.IEnumerable`1 whose distinct elements form the first set for the union.
second	An T:System.Collections.Generic.IEnumerable`1 whose distinct elements form the second set for the union.
comparer	The T:System.Collections.Generic.IEqualityComparer`1 to compare values.

Template Parameters

TSource The type of the elements of the input sequences.

Returns: An T:System.Collections.Generic.IEnumerable`1 that contains the elements from both input sequences, excluding duplicates.

Exceptions

T:System.ArgumentNullException first or second is null.

Definition at line 2020 of file Enumerable.cs.

◆ Where< TSource >() [1/2]

static IEnumerable<TSource> System.Linq.Enumerable.Where< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, bool >	predicate
	)

static

Filters a sequence of values based on a predicate.

Parameters

source	An T:System.Collections.Generic.IEnumerable`1 to filter.
predicate	A function to test each element for a condition.

Template Parameters

TSource The type of the elements of source .

Returns: An T:System.Collections.Generic.IEnumerable`1 that contains elements from the input sequence that satisfy the condition.

Exceptions

T:System.ArgumentNullException source or predicate is null.

Definition at line 928 of file Enumerable.cs.

◆ Where< TSource >() [2/2]

static IEnumerable<TSource> System.Linq.Enumerable.Where< TSource >	(	this IEnumerable< TSource >	source,
		Func< TSource, int, bool >	predicate
	)

static

Filters a sequence of values based on a predicate. Each element's index is used in the logic of the predicate function.

Parameters

source	An T:System.Collections.Generic.IEnumerable`1 to filter.
predicate	A function to test each source element for a condition; the second parameter of the function represents the index of the source element.

Template Parameters

TSource The type of the elements of source .

Returns: An T:System.Collections.Generic.IEnumerable`1 that contains elements from the input sequence that satisfy the condition.

Exceptions

T:System.ArgumentNullException source or predicate is null.

Definition at line 961 of file Enumerable.cs.

◆ Zip< TFirst, TSecond, TResult >()

static IEnumerable<TResult> System.Linq.Enumerable.Zip< TFirst, TSecond, TResult >	(	this IEnumerable< TFirst >	first,
		IEnumerable< TSecond >	second,
		Func< TFirst, TSecond, TResult >	resultSelector
	)

static

Applies a specified function to the corresponding elements of two sequences, producing a sequence of the results.

Parameters

first	The first sequence to merge.
second	The second sequence to merge.
resultSelector	A function that specifies how to merge the elements from the two sequences.

Template Parameters

TFirst	The type of the elements of the first input sequence.
TSecond	The type of the elements of the second input sequence.
TResult	The type of the elements of the result sequence.

Returns: An T:System.Collections.Generic.IEnumerable`1 that contains merged elements of two input sequences.

Exceptions

T:System.ArgumentNullException first or second is null.

Definition at line 1914 of file Enumerable.cs.

The documentation for this class was generated from the following file:

D:/All cs/System.Linq/Enumerable.cs

Static Public Member Functions

Detailed Description

Member Function Documentation

◆ Aggregate< TSource >()

◆ Aggregate< TSource, TAccumulate >()

◆ Aggregate< TSource, TAccumulate, TResult >()

◆ All< TSource >()

◆ Any< TSource >() [1/2]

◆ Any< TSource >() [2/2]

◆ Append< TSource >()

◆ AsEnumerable< TSource >()

◆ Average() [1/10]

◆ Average() [2/10]

◆ Average() [3/10]

◆ Average() [4/10]

◆ Average() [5/10]

◆ Average() [6/10]

◆ Average() [7/10]

◆ Average() [8/10]

◆ Average() [9/10]

◆ Average() [10/10]

◆ Average< TSource >() [1/10]

◆ Average< TSource >() [2/10]

◆ Average< TSource >() [3/10]

◆ Average< TSource >() [4/10]

◆ Average< TSource >() [5/10]

◆ Average< TSource >() [6/10]

◆ Average< TSource >() [7/10]

◆ Average< TSource >() [8/10]

◆ Average< TSource >() [9/10]

◆ Average< TSource >() [10/10]

◆ Cast< TResult >()

◆ Concat< TSource >()

◆ Contains< TSource >() [1/2]

◆ Contains< TSource >() [2/2]

◆ Count< TSource >() [1/2]

◆ Count< TSource >() [2/2]

◆ DefaultIfEmpty< TSource >() [1/2]

◆ DefaultIfEmpty< TSource >() [2/2]

◆ Distinct< TSource >() [1/2]

◆ Distinct< TSource >() [2/2]

◆ ElementAt< TSource >()

◆ ElementAtOrDefault< TSource >()

◆ Empty< TResult >()

◆ Except< TSource >() [1/2]

◆ Except< TSource >() [2/2]

◆ First< TSource >() [1/2]

◆ First< TSource >() [2/2]

◆ FirstOrDefault< TSource >() [1/2]

◆ FirstOrDefault< TSource >() [2/2]

◆ GroupBy< TSource, TKey >() [1/2]

◆ GroupBy< TSource, TKey >() [2/2]

◆ GroupBy< TSource, TKey, TElement >() [1/2]

◆ GroupBy< TSource, TKey, TElement >() [2/2]

◆ GroupBy< TSource, TKey, TElement, TResult >() [1/2]

◆ GroupBy< TSource, TKey, TElement, TResult >() [2/2]

◆ GroupBy< TSource, TKey, TResult >() [1/2]

◆ GroupBy< TSource, TKey, TResult >() [2/2]

◆ GroupJoin< TOuter, TInner, TKey, TResult >() [1/2]

◆ GroupJoin< TOuter, TInner, TKey, TResult >() [2/2]

◆ Intersect< TSource >() [1/2]

◆ Intersect< TSource >() [2/2]

◆ Join< TOuter, TInner, TKey, TResult >() [1/2]

◆ Join< TOuter, TInner, TKey, TResult >() [2/2]

◆ Last< TSource >() [1/2]

◆ Last< TSource >() [2/2]

◆ LastOrDefault< TSource >() [1/2]

◆ LastOrDefault< TSource >() [2/2]

◆ LongCount< TSource >() [1/2]

◆ LongCount< TSource >() [2/2]

◆ Max() [1/10]

◆ Max() [2/10]

◆ Max() [3/10]

◆ Max() [4/10]

◆ Max() [5/10]

◆ Max() [6/10]

◆ Max() [7/10]

◆ Max() [8/10]

◆ Max() [9/10]

◆ Max() [10/10]