Window Phone silverlight 8.1 HttpNotificationChannel ChannelUriUpdated 未命中

Posted 2023-02-24

【中文标题】Window Phone silverlight 8.1 HttpNotificationChannel ChannelUriUpdated 未命中

【英文标题】：Window Phone silverlight 8.1 HttpNotificationChannel ChannelUriUpdated not being hit

【发布时间】：2015-08-06 05:54:19

【问题描述】：

我有一个非常基本的 Windows Phone Silverlight 8.1 应用程序，其中包含以下内容（我想在将其添加到更大的现有应用程序之前证明这个概念）：

HttpNotificationChannel pushChannel;

void registerPushChannel()

   pushChannel = HttpNotificationChannel.Find(channelName);

   // If the channel was not found, then create a new connection to the push service.
   if (pushChannel == null)
   
      pushChannel = new HttpNotificationChannel(channelName);

      // Register for all the events before attempting to open the channel.
      pushChannel.ChannelUriUpdated += new EventHandler<NotificationChannelUriEventArgs>(PushChannel_ChannelUriUpdated);
      pushChannel.ErrorOccurred += new EventHandler<NotificationChannelErrorEventArgs>(PushChannel_ErrorOccurred);
      pushChannel.HttpNotificationReceived += new EventHandler<HttpNotificationEventArgs>(PushChannel_HttpNotificationReceived);

      pushChannel.Open();

   
   else
   
      // The channel was already open, so just register for all the events.
      pushChannel.ChannelUriUpdated += new EventHandler<NotificationChannelUriEventArgs>(PushChannel_ChannelUriUpdated);
      pushChannel.ErrorOccurred += new EventHandler<NotificationChannelErrorEventArgs>(PushChannel_ErrorOccurred);
      pushChannel.HttpNotificationReceived += new EventHandler<HttpNotificationEventArgs>(PushChannel_HttpNotificationReceived);

      // code which passes the new channel URI back to my web service     
    


void PushChannel_ChannelUriUpdated(object sender, NotificationChannelUriEventArgs e)

   Dispatcher.BeginInvoke(() =>
   
       // Display the new URI for testing purposes. Normally, the URI would be passed back to your web service at this point.
       System.Diagnostics.Debug.WriteLine(e.ChannelUri.ToString());
       MessageBox.Show(String.Format("Channel Uri is 0",
                    e.ChannelUri.ToString()));

     );
 

问题是 PushChannel_ChannelUriUpdated 永远不会被击中，我就是不知道为什么！

我已经在我的 WMAppManifest.xml 中设置了 ID_CAP_PUSH_NOTIFICATION 并且还 Toast Capable = yes 在我的 Package.appmanifest 中......我错过了什么运动鞋？

【问题讨论】：

哪里有问题？

pushChannel.Uri 在 pushChannel.Open() 之后总是为空；并且连接状态已断开。然后当我调用 NotificationHub hub = new NotificationHub(hubName, connectionString);等待 hub.RegisterNativeAsync(pushChannel.ChannelUri.ToString());它在 RegisterNativeAsync 上引发 NullReferenceException

您尝试过我发布的答案吗？

【参考方案1】：

我尝试过以下通知代码：

HttpNotificationChannel pushChannel;

将 pushChannel 作为 globle 放在 App.xaml.cs 文件中，它在 EventHandler 中使用

string channelName = "PushChannel";
pushChannel = HttpNotificationChannel.Find(channelName);
//Push Notifications
if (pushChannel == null)

    pushChannel = new HttpNotificationChannel(channelName);

    //// Register for all the events before attempting to open the channel.
    pushChannel.ChannelUriUpdated += new EventHandler<NotificationChannelUriEventArgs>(PushChannel_ChannelUriUpdated);
    pushChannel.ErrorOccurred += new EventHandler<NotificationChannelErrorEventArgs>(PushChannel_ErrorOccurred);

    // Register for this notification only if you need to receive the notifications while your application is running.
    pushChannel.ShellToastNotificationReceived += new EventHandler<NotificationEventArgs>(PushChannel_ShellToastNotificationReceived);

    pushChannel.Open();

    // Bind this new channel for toast events.
    pushChannel.BindToShellToast();

else

    // The channel was already open, so just register for all the events.
    pushChannel.ChannelUriUpdated += new EventHandler<NotificationChannelUriEventArgs>(PushChannel_ChannelUriUpdated);
    pushChannel.ErrorOccurred += new EventHandler<NotificationChannelErrorEventArgs>(PushChannel_ErrorOccurred);

    // Register for this notification only if you need to receive the notifications while your application is running.
    pushChannel.ShellToastNotificationReceived += new EventHandler<NotificationEventArgs>(PushChannel_ShellToastNotificationReceived);

    // Display the URI for testing purposes. Normally, the URI would be passed back to your web service at this point.enter code here
    Deployment.Current.Dispatcher.BeginInvoke(() =>
    
        //pushURI = pushChannel.ChannelUri.ToString();
        //MessageBox.Show(String.Format("Channel Uri is 0", pushChannel.ChannelUri.ToString()));
        Notification.ChannelURI = pushChannel.ChannelUri.ToString();
    );

将上述代码放入您的 App.xaml.cs 文件中 App()

活动：

void PushChannel_ChannelUriUpdated(object sender, NotificationChannelUriEventArgs e1)

    try
    
        Deployment.Current.Dispatcher.BeginInvoke(() =>
        
            MessageBox.Show(String.Format("Channel Uri is 0", e1.ChannelUri.ToString()));
        );
    
    catch (Exception ex)
     

void PushChannel_ErrorOccurred(object sender, NotificationChannelErrorEventArgs e2)

    try
    
        // Error handling logic for your particular application would be here.
        Deployment.Current.Dispatcher.BeginInvoke(() =>
        
            //MessageBox.Show(String.Format("A push notification 0 error occurred.  1 (2) 3", e2.ErrorType, e2.Message, e2.ErrorCode, e2.ErrorAdditionalData));
        );
    
    catch (Exception ex)
     

【讨论】：

谢谢 - 我应该更精确...在 pushChannel.Open(); pushChannel Uri 为 null 且 connectionstatus 已断开连接。

@BzBurr 我在PushChannel_ChannelUriUpdated 事件中得到了 ChannelUri 得到了 ChannelUri

@BzBurr 请检查您的配置

@BzBurr PushChannel_ChannelUriUpdated 不是每次都调用，而是在HttpNotificationChannel 找不到时调用 OR null

ID_CAP_PUSH_NOTIFICATION 已开启，ID_CAP_NETWORKING 已开启，应用支持 Toast...我可能缺少什么？