mcs/class/referencesource/System.Web/Util/TaskExtensions.cs

   1 //------------------------------------------------------------------------------
   2 // <copyright file="TaskExtensions.cs" company="Microsoft">
   3 //     Copyright (c) Microsoft Corporation.  All rights reserved.
   4 // </copyright>
   5 //------------------------------------------------------------------------------
   6
   7 namespace System.Web.Util {
   8     using System;
   9     using System.Threading.Tasks;
  10
  11     // Contains helper methods for dealing with Tasks
  12
  13     internal static class TaskExtensions {
  14
  15         // Throws the exception that faulted a Task, similar to what 'await' would have done.
  16         // Useful for synchronous methods which have a Task instance they know to be already completed
  17         // and where they want to let the exception propagate upward.
  18         public static void ThrowIfFaulted(this Task task) {
  19             Debug.Assert(task.IsCompleted, "The Task passed to this method must be marked as completed so that this method doesn't block.");
  20             task.GetAwaiter().GetResult();
  21         }
  22
  23         // Gets a WithinCancellableCallbackTaskAwaiter from a Task.
  24         public static WithinCancellableCallbackTaskAwaitable WithinCancellableCallback(this Task task, HttpContext context) {
  25             return new WithinCancellableCallbackTaskAwaitable(context, task.GetAwaiter());
  26         }
  27
  28     }
  29 }