Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

external/referencesource/System.Web/EventHandlerTaskAsyncHelper.cs

@@ -0,0 +1,40 @@
+//------------------------------------------------------------------------------
+// <copyright file="EventHandlerTaskAsyncHelper.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>                                                                
+//------------------------------------------------------------------------------
+
+/*
+ * Assists in converting an EventHandler written using the Task Asynchronous Pattern to a Begin/End method pair.
+ * 
+ * Copyright (c) 2010 Microsoft Corporation
+ */
+
+namespace System.Web {
+    using System;
+    using System.Threading;
+    using System.Threading.Tasks;
+
+    public sealed class EventHandlerTaskAsyncHelper {
+
+        public EventHandlerTaskAsyncHelper(TaskEventHandler handler) {
+            if (handler == null) {
+                throw new ArgumentNullException("handler");
+            }
+
+            BeginEventHandler = (sender, e, cb, extraData) => TaskAsyncHelper.BeginTask(() => handler(sender, e), cb, extraData);
+            EndEventHandler = TaskAsyncHelper.EndTask;
+        }
+
+        public BeginEventHandler BeginEventHandler {
+            get;
+            private set;
+        }
+
+        public EndEventHandler EndEventHandler {
+            get;
+            private set;
+        }
+
+    }
+}