C# 异步转同步 PushFrame

1     private static async Task<string> TestWithResultAsync()
2     {
3         Debug.WriteLine("1. 异步任务start……");
4         await Task.Delay(2000);
5         Debug.WriteLine("2. 异步任务end……");
6         return "2秒以后";
7     }

1     private void PushFrameTaskResult_OnClick(object sender, RoutedEventArgs e)
2     {
3         var result = AwaitByPushFrame(TestWithResultAsync());
4         Debug.WriteLine($"PushFrameTaskResult_OnClick end:{result}");
5     }

 1     public static TResult AwaitByPushFrame<TResult>(Task<TResult> task)
 2     {
 3         var frame = new DispatcherFrame();
 4         task.ContinueWith(t =>
 5         {
 6             frame.Continue = false;
 7         });
 8         Dispatcher.PushFrame(frame);
 9         return task.Result;
10     }

1     public static void AwaitByPushFrame(Task task)
2     {
3         var frame = new DispatcherFrame();
4         task.ContinueWith(t =>
5         {
6             frame.Continue = false;
7         });
8         Dispatcher.PushFrame(frame);
9     }