1 files changed, 34 insertions, 0 deletions
diff --git a/Ix/NET/System.Interactive.Async/IAsyncEnumerator.cs b/Ix/NET/System.Interactive.Async/IAsyncEnumerator.cs
new file mode 100644
index 0000000..72cfdbc
--- /dev/null
+++ b/Ix/NET/System.Interactive.Async/IAsyncEnumerator.cs
@@ -0,0 +1,34 @@
+// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
+using System;
+using System.Threading.Tasks;
+using System.Threading;
+
+namespace System.Collections.Generic
+{
+    /// <summary>
+    /// Asynchronous version of the IEnumerator&lt;T&gt; interface, allowing elements to be
+    /// retrieved asynchronously.
+    /// </summary>
+    /// <typeparam name="T">Element type.</typeparam>
+    public interface IAsyncEnumerator<
+#if DESKTOPCLR40 || SILVERLIGHT4
+        out
+#endif
+        T> : IDisposable
+    {
+        /// <summary>
+        /// Advances the enumerator to the next element in the sequence, returning the result asynchronously.
+        /// </summary>
+        /// <param name="cancellationToken">Cancellation token that can be used to cancel the operation.</param>
+        /// <returns>
+        /// Task containing the result of the operation: true if the enumerator was successfully advanced 
+        /// to the next element; false if the enumerator has passed the end of the sequence.
+        /// </returns>
+        Task<bool> MoveNext(CancellationToken cancellationToken);
+
+        /// <summary>
+        /// Gets the current element in the iteration.
+        /// </summary>
+        T Current { get; }
+    }
+}