应用程序打开时，PUSH Toast通知未显示

Question

我正在从我的服务器向应用程序发送通知，但应用程序仅在关闭时收到通知。我知道有一行必须添加，以便您的应用程序在打开时收到通知，并且我的代码中包含该通知。 （见下文）我在2个应用程序中使用相同的代码，结果相同。

        public App()
                {

                    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();
                        });
                    }
              }



     void PushChannel_ChannelUriUpdated(object sender, NotificationChannelUriEventArgs e)
            {
                Deployment.Current.Dispatcher.BeginInvoke(() =>
                {
                    pushURI = e.ChannelUri.ToString();
                });
            }


void PushChannel_ErrorOccurred(object sender, NotificationChannelErrorEventArgs e)
        {
            // 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}",
                    e.ErrorType, e.Message, e.ErrorCode, e.ErrorAdditionalData));
            });
        }

void PushChannel_ShellToastNotificationReceived(object sender, NotificationEventArgs e)
        {
            string relativeUri = string.Empty;

            // Parse out the information that was part of the message.
            foreach (string key in e.Collection.Keys)
            {
                if (string.Compare(
                    key,
                    "wp:Param",
                    System.Globalization.CultureInfo.InvariantCulture,
                    System.Globalization.CompareOptions.IgnoreCase) == 0)
                {
                    relativeUri = e.Collection[key];
                }
            }
        }

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