code.grnet.gr Git - pithos-ms-client/blob - trunk/Libraries/ParallelExtensionsExtras/Extensions/EAP/EAPCommon.cs

   1 //--------------------------------------------------------------------------
   2 //
   3 //  Copyright (c) Microsoft Corporation.  All rights reserved.
   4 //
   5 //  File: EAPCommon.cs
   6 //
   7 //--------------------------------------------------------------------------
   8
   9 using System.ComponentModel;
  10
  11 namespace System.Threading.Tasks
  12 {
  13     internal class EAPCommon
  14     {
  15         internal static void HandleCompletion<T>(
  16             TaskCompletionSource<T> tcs, AsyncCompletedEventArgs e, Func<T> getResult, Action unregisterHandler)
  17         {
  18             // Transfers the results from the AsyncCompletedEventArgs and getResult() to the
  19             // TaskCompletionSource, but only AsyncCompletedEventArg's UserState matches the TCS
  20             // (this check is important if the same WebClient is used for multiple, asynchronous
  21             // operations concurrently).  Also unregisters the handler to avoid a leak.
  22             if (e.UserState == tcs)
  23             {
  24                 if (e.Cancelled) tcs.TrySetCanceled();
  25                 else if (e.Error != null) tcs.TrySetException(e.Error);
  26                 else tcs.TrySetResult(getResult());
  27                 unregisterHandler();
  28             }
  29         }
  30     }
  31 }