Question

我正在开发一个使用原始通知的Windows Phone 8应用。为此，我正在关注示例"How to send and receive raw notifications for Windows Phone 8"。

我完全按照样本编码：

public MainPage()
        {
            /// Holds the push channel that is created or found.
            HttpNotificationChannel pushChannel;

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

            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);

                // 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);

                // 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()));

            }
        }

在设备中运行代码后，我发现应用程序每次启动时都会生成不同的URI。

我意识到 HttpNotificationChannel.Find（channelName）总是返回null（这就是应用程序始终生成新URI的原因。）

我已经阅读了this，但仍然没有帮助我。

所以，我的问题是：

如果应用已经生成了频道，那么 HttpNotificationChannel.Find（channelName）会返回与“null”不同的内容吗？

如果我错过了可以提供帮助的内容，请告诉我。

Answer 1

我查看了你的帖子和提到的链接。似乎channelUri更新是相当随机的（通常它肯定会改变app卸载/安装，但也可能有其他场景）。确保用户正确定位的一种确定方法是将channelUri与另一个唯一标识符相关联。例如，在获取channelUri之后，您可能希望使用uri和唯一的用户ID更新服务器数据库。对于子请求调用，可以仅为同一用户更新频道。希望这有点帮助。

WP8上的推送通知始终生成新的URI

1 个答案: