1 files changed, 46 insertions, 0 deletions
diff --git a/Xamarin.Forms.Core/CastingEnumerator.cs b/Xamarin.Forms.Core/CastingEnumerator.cs
new file mode 100644
index 00000000..62a823b1
--- /dev/null
+++ b/Xamarin.Forms.Core/CastingEnumerator.cs
@@ -0,0 +1,46 @@
+using System.Collections;
+using System.Collections.Generic;
+
+namespace Xamarin.Forms
+{
+	internal class CastingEnumerator<T, TFrom> : IEnumerator<T> where T : class where TFrom : class
+	{
+		readonly IEnumerator<TFrom> _enumerator;
+
+		bool _disposed;
+
+		public CastingEnumerator(IEnumerator<TFrom> enumerator)
+		{
+			_enumerator = enumerator;
+		}
+
+		public void Dispose()
+		{
+			if (_disposed)
+				return;
+			_disposed = true;
+
+			_enumerator.Dispose();
+		}
+
+		object IEnumerator.Current
+		{
+			get { return Current; }
+		}
+
+		public bool MoveNext()
+		{
+			return _enumerator.MoveNext();
+		}
+
+		public void Reset()
+		{
+			_enumerator.Reset();
+		}
+
+		public T Current
+		{
+			get { return _enumerator.Current as T; }
+		}
+	}
+}
+\ No newline at end of file