ICollection.cs

using System.Runtime.CompilerServices;

namespace System.Collections.Generic
{
    [TypeDependency("System.SZArrayHelper")]
    [__DynamicallyInvokable]
    public interface ICollection<T> : IEnumerable<T>, IEnumerable
    {
        [__DynamicallyInvokable]
        int Count
        {
            [__DynamicallyInvokable]
            get;
        }

        [__DynamicallyInvokable]
        bool IsReadOnly
        {
            [__DynamicallyInvokable]
            get;
        }

        [__DynamicallyInvokable]
        void Add(T item);

        [__DynamicallyInvokable]
        void Clear();

        [__DynamicallyInvokable]
        bool Contains(T item);

        [__DynamicallyInvokable]
        void CopyTo(T[] array, int arrayIndex);

        [__DynamicallyInvokable]
        bool Remove(T item);
    }
}