BindableIterableToEnumerableAdapter.cs

using System.Collections;
using System.Runtime.CompilerServices;
using System.Security;

namespace System.Runtime.InteropServices.WindowsRuntime
{
    internal sealed class BindableIterableToEnumerableAdapter
    {
        private sealed class NonGenericToGenericIterator : IIterator<object>
        {
            private IBindableIterator iterator;

            public object Current => iterator.Current;

            public bool HasCurrent => iterator.HasCurrent;

            public NonGenericToGenericIterator(IBindableIterator iterator)
            {
                this.iterator = iterator;
            }

            public bool MoveNext()
            {
                return iterator.MoveNext();
            }

            public int GetMany(object[] items)
            {
                throw new NotSupportedException();
            }
        }

        private BindableIterableToEnumerableAdapter()
        {
        }

        [SecurityCritical]
        internal IEnumerator GetEnumerator_Stub()
        {
            IBindableIterable bindableIterable = JitHelpers.UnsafeCast<IBindableIterable>(this);
            return new IteratorToEnumeratorAdapter<object>(new NonGenericToGenericIterator(bindableIterable.First()));
        }
    }
}