Task 超时取消

  using (var cts = new CancellationTokenSource(TimeSpan.FromSeconds(3)))
  {
     // cts.CancelAfter(TimeSpan.FromSeconds(3));
      try
      {
          var token = cts.Token;
         await Task.Delay(5000, token);
      }
      catch (Exception e)
      {
          if (e is TaskCanceledException te)
          {

          }

      }

  }