pushChannel在windows phone 8.1設備中始終爲空（推送通知）

Question

pushChannel = HttpNotificationChannel.Find(channelName); 

但每次運行應用程序時都會返回我null。

它只在wp8中給windows phone 8.1設備中的null註冊頻道。

Answer 1

如果它將推送頻道返回爲「null」，那麼您是否嘗試創建推送頻道？

// The name of our push channel. 
    string channelName = "ToastSampleChannel"; 

    InitializeComponent(); 

    // Try to find the push channel. 
    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); <---- Create a channel if it doesn't exist 
    ###################################################################### 
     // 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. 
     System.Diagnostics.Debug.WriteLine(pushChannel.ChannelUri.ToString()); 
     MessageBox.Show(String.Format("Channel Uri is {0}", 
      pushChannel.ChannelUri.ToString())); 

    } 

Answer 2

PushNotificationChannel channel = await PushNotificationChannelManager.CreatePushNotificationChannelForApplicationAsync(); 

的Debug.WriteLine（ 「通道::」 + channel.Uri.ToString（））;