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我正在编写一个依赖通知工作的 Windows 桌面应用程序。但是，当我收到通知时，通道上的事件处理程序代码 PushNotificationReceived 似乎并没有真正触发。在将其 uri 发送到我的服务器之前，调用以下代码来获取通道：

internal async Task<PushNotificationChannel> GetChannel()
    {
        PushNotificationChannel pnc;
        try
        {
            pnc = await PushNotificationChannelManager.CreatePushNotificationChannelForApplicationAsync();
            if (_channel == null || !pnc.Uri.Equals(_channel.Uri))
            {
                _channel = pnc;
                _channel.PushNotificationReceived += OnPushNotificationReceived;
                Debug.WriteLine(_channel.Uri);
            }
        }
        catch (Exception ex)
        {
            Debug.WriteLine(ex.Message);
            _channel = null;
        }
               dispatcher = Windows.UI.Core.CoreWindow.GetForCurrentThread().Dispatcher;
        return _channel;
    }

这样，无论何时创建或更新通道（通过不同的通道 uri），它都应该将新通道的 PushNotificationReceived 事件分配给以下内容（这基本上是从 msdn 的示例中提取的）：

void OnPushNotificationReceived(PushNotificationChannel sender, PushNotificationReceivedEventArgs e)
    {
        string typeString = String.Empty;
        string notificationContent = String.Empty;
        switch (e.NotificationType)
        {
            //
            //other notification types omitted for brevity
            //
            case PushNotificationType.Toast:
                notificationContent = e.ToastNotification.Content.GetXml();
                typeString = "Toast";
                // Setting the cancel property prevents the notification from being delivered. It's especially important to do this for toasts:
                // if your application is already on the screen, there's no need to display a toast from push notifications.
                e.Cancel = true;
                break;
        }

        Debug.WriteLine("Received notification, with payload: {0}", notificationContent);

        string text = "Received a " + typeString + " notification, containing: " + notificationContent;

        var ignored = dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
        {
            MainPage.Current.ClearBanner();
        });
    }

重要的是，“MainPage.Current”是对应用程序主页作为静态变量的引用。清晰的横幅行只是从主页中删除了一个粉红色的横幅（只是试图让一些简单的工作开始）。

但是，代码似乎永远不会触发（没有调试语句，粉红色横幅仍然存在）。我成功地获得了 toast 通知，点击它会将焦点设置到我的应用程序上，所以它绝对不会去错地方。

有什么我做错了或者有什么方法可以自己调试通知吗？

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