InvocationExpression.cs

using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Diagnostics;

namespace System.Linq.Expressions
{
    [DebuggerTypeProxy(typeof(InvocationExpressionProxy))]
    [global::__DynamicallyInvokable]
    public sealed class InvocationExpression : Expression, IArgumentProvider
    {
        private IList<Expression> _arguments;

        private readonly Expression _lambda;

        private readonly Type _returnType;

        [global::__DynamicallyInvokable]
        public sealed override Type Type
        {
            [global::__DynamicallyInvokable]
            get
            {
                return _returnType;
            }
        }

        [global::__DynamicallyInvokable]
        public sealed override ExpressionType NodeType
        {
            [global::__DynamicallyInvokable]
            get
            {
                return ExpressionType.Invoke;
            }
        }

        [global::__DynamicallyInvokable]
        public Expression Expression
        {
            [global::__DynamicallyInvokable]
            get
            {
                return _lambda;
            }
        }

        [global::__DynamicallyInvokable]
        public ReadOnlyCollection<Expression> Arguments
        {
            [global::__DynamicallyInvokable]
            get
            {
                return Expression.ReturnReadOnly(ref _arguments);
            }
        }

        [global::__DynamicallyInvokable]
        int IArgumentProvider.ArgumentCount
        {
            [global::__DynamicallyInvokable]
            get
            {
                return _arguments.Count;
            }
        }

        internal LambdaExpression LambdaOperand
        {
            get
            {
                if (_lambda.NodeType != ExpressionType.Quote)
                {
                    return _lambda as LambdaExpression;
                }
                return (LambdaExpression)((UnaryExpression)_lambda).Operand;
            }
        }

        internal InvocationExpression(Expression lambda, IList<Expression> arguments, Type returnType)
        {
            _lambda = lambda;
            _arguments = arguments;
            _returnType = returnType;
        }

        [global::__DynamicallyInvokable]
        public InvocationExpression Update(Expression expression, IEnumerable<Expression> arguments)
        {
            if (expression == Expression && arguments == Arguments)
            {
                return this;
            }
            return Expression.Invoke(expression, arguments);
        }

        [global::__DynamicallyInvokable]
        Expression IArgumentProvider.GetArgument(int index)
        {
            return _arguments[index];
        }

        protected internal override Expression Accept(ExpressionVisitor visitor)
        {
            return visitor.VisitInvocation(this);
        }

        internal InvocationExpression Rewrite(Expression lambda, Expression[] arguments)
        {
            return Expression.Invoke(lambda, arguments ?? _arguments);
        }
    }
}