Imported Upstream version 3.6.0

Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14

external/rx/Rx/NET/Source/System.Reactive.WindowsRuntime/EventPatternSource.cs

@@ -0,0 +1,29 @@
+// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
+
+#if HAS_WINRT
+using Windows.Foundation;
+
+namespace System.Reactive
+{
+    class EventPatternSource<TSender, TEventArgs> : EventPatternSourceBase<TSender, TEventArgs>, IEventPatternSource<TSender, TEventArgs>
+    {
+        public EventPatternSource(IObservable<EventPattern<TSender, TEventArgs>> source, Action<Action<TSender, TEventArgs>, /*object,*/ EventPattern<TSender, TEventArgs>> invokeHandler)
+            : base(source, invokeHandler)
+        {
+        }
+
+        event TypedEventHandler<TSender, TEventArgs> IEventPatternSource<TSender, TEventArgs>.OnNext
+        {
+            add
+            {
+                Add(value, (o, e) => value(o, e));
+            }
+
+            remove
+            {
+                Remove(value);
+            }
+        }
+    }
+}
+#endif