Question

我正在尝试在Windows Phone上实现基于推送通知的应用。我已经能够在模拟器上检索Channel Uri，并通过我的服务器向模拟器发送推送通知。

另一方面，我遇到了在我的设备上部署相同解决方案的问题。 Uri的用法返回NullReferenceException。虽然Channel Uri显示“无法评估表达”。

这是我的代码放在页面构造函数中。我也尝试过更改_pushChannelName。

private static string _pushChannelName = "TestApp";

    // Constructor
    public MainPage()
    {
        HttpNotificationChannel pushChannel;

        InitializeComponent();

        pushChannel = HttpNotificationChannel.Find(_pushChannelName);

        if (pushChannel == null) 
        {
            MessageBox.Show("NULL");
            pushChannel = new HttpNotificationChannel(_pushChannelName);

            pushChannel.ChannelUriUpdated += new EventHandler<NotificationChannelUriEventArgs>(pushChannel_ChannelUriUpdated);
            pushChannel.ErrorOccurred += new EventHandler<NotificationChannelErrorEventArgs>(pushChannel_ErrorOccurred);

            pushChannel.ShellToastNotificationReceived +=new EventHandler<NotificationEventArgs>(pushChannel_ShellToastNotificationReceived);

            pushChannel.Open();

            pushChannel.BindToShellToast();
        }
        else
        {

            pushChannel.ChannelUriUpdated += new EventHandler<NotificationChannelUriEventArgs>(pushChannel_ChannelUriUpdated);
            pushChannel.ErrorOccurred += new EventHandler<NotificationChannelErrorEventArgs>(pushChannel_ErrorOccurred);

            pushChannel.ShellToastNotificationReceived += new EventHandler<NotificationEventArgs>(pushChannel_ShellToastNotificationReceived);

            //System.Diagnostics.Debug.WriteLine(pushChannel.ChannelUri.ToString());
            textBox1.Text = pushChannel.ChannelUri.ToString();

        }

        MessageBox.Show(String.Format("Channel Uri is {0}", pushChannel.ChannelUri.ToString()));
    }

我也尝试过从ChangeUri事件中查看Uri。该事件不会在设备上触发，而Push应用程序正常运行。甚至不符合频道限制。

private void pushChannel_ChannelUriUpdated(Object sender, NotificationChannelUriEventArgs e)
    {
        Dispatcher.BeginInvoke(() =>
        {

            MessageBox.Show(String.Format("Channel Uri is {0}",
                e.ChannelUri.ToString()));

        });
    }

Answer 1

许多用户都面临着这个问题。解决方案有两个。

第一种解决方案是停止与市场帐户关联的所有应用程序，游戏和其他软件，并删除或停止通知。重启手机（关机/开机）并等待24小时。
第二个解决方案是向Marketplace付费并注册您的应用程序，从Marketplace获取证书并插入您的应用程序。然后当打开新通道时必须使用静态类“HttpNotificationChannel”的第二个重载构造函数：

[SecuritySafeCritical] public HttpNotificationChannel（string channelName，string serviceName）;

Push Channel Uri在设备上显示“无法评估表达式”。在模拟器上完美运行

1 个答案: