将 Channel Uri 发送到云服务

Posted 2023-02-24

【中文标题】将 Channel Uri 发送到云服务

【英文标题】：Sending Channel Uri to cloud service

【发布时间】：2015-03-09 09:20:49

【问题描述】：

我正在开发一个应用程序来接收推送通知。通过使用下面的代码，我获得了频道 uri..现在我的问题是我应该如何将它发送到我正在使用的 web 服务..

    public MainPage()
        

           HttpNotificationChannel pushChannel;

        // 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);

            // 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()));


        
    



    /// <summary>
    /// Event handler for when the push channel Uri is updated.
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    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()));

        );
    

   void PushChannel_ErrorOccurred(object sender, NotificationChannelErrorEventArgs e)
    
        // Error handling logic for your particular application would be here.
        Dispatcher.BeginInvoke(() =>
            MessageBox.Show(String.Format("A push notification 0 error occurred.  1 (2) 3",
                e.ErrorType, e.Message, e.ErrorCode, e.ErrorAdditionalData))
                );
    

    /// <summary>
    /// Event handler for when a toast notification arrives while your application is running.  
    /// The toast will not display if your application is running so you must add this
    /// event handler if you want to do something with the toast notification.
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    void PushChannel_ShellToastNotificationReceived(object sender, NotificationEventArgs e)
    
        StringBuilder message = new StringBuilder();
        string relativeUri = string.Empty;

        message.AppendFormat("Received Toast 0:\n", DateTime.Now.ToShortTimeString());

        // Parse out the information that was part of the message.
        foreach (string key in e.Collection.Keys)
        
            message.AppendFormat("0: 1\n", key, e.Collection[key]);

            if (string.Compare(
                key,
                "wp:Param",
                System.Globalization.CultureInfo.InvariantCulture,
                System.Globalization.CompareOptions.IgnoreCase) == 0)
            
                relativeUri = e.Collection[key];
            
        

        // Display a dialog of all the fields in the toast.
        Dispatcher.BeginInvoke(() => MessageBox.Show(message.ToString()));

    

在收到 Channel uri 后，我应该如何将它传递给 webserver。我使用了下面的代码但没有工作。

private void RegisterUriWithService()
        
          string baseUri = "http://localhost:8000/RegirstatorService/Register?uri=0"; 

       string theUri = String.Format(baseUri, pushChannel.ChannelUri.ToString());
        System.Diagnostics.Debug.WriteLine(theUri);
        WebClient client = new WebClient();
        client.DownloadStringCompleted += (s, e) =>
        
            if (null == e.Error)
                Dispatcher.BeginInvoke(() => UpdateStatus("Registration succeeded"));
            else
                Dispatcher.BeginInvoke(() =>
                                UpdateStatus("Registration failed: " + e.Error.Message));
        ;
        client.DownloadStringAsync(new Uri(theUri));
    

错误就像

错误：无法将 lambda 表达式转换为类型“System.Delegate”，因为它不是委托类型。 错误：当前上下文中不存在名称“pushChannel”。

Control 没有进入 RegisterUriWithService() 函数。我怎样才能克服这个错误并将通道 uri 发送到 web 服务。 任何人请帮助我.. 非常感谢提前...

【参考方案1】：

RegisterUriWithService() 不会从代码中的任何位置调用。

像这样重写你的方法

    private void RegisterUriWithService(string pushChannelUri)
    
      string baseUri = "http://localhost:8000/RegirstatorService/Register?uri=0"; 

   string theUri = String.Format(baseUri, pushChannelUri); // pushChannelUri is passed as parameter to this method
    System.Diagnostics.Debug.WriteLine(theUri);
    WebClient client = new WebClient();
    client.DownloadStringCompleted += (s, e) =>
    
        if (null == e.Error)
            Dispatcher.BeginInvoke(() => UpdateStatus("Registration succeeded"));
        else
            Dispatcher.BeginInvoke(() =>
                            UpdateStatus("Registration failed: " + e.Error.Message));
    ;
    client.DownloadStringAsync(new Uri(theUri));
    

当您的推送频道打开并更新频道 URI 时，将触发 PushChannel_ChannelUriUpdated 事件。

将推送通道 URI 存储在局部变量 pushChannelUri 中并从那里调用方法 RegisterUriWithService(pushChannelUri)。

如果推送通道已经存在且带有 URI，则控制转到 else 块

       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()));

       pushChannelUri = pushChannel.ChannelUri.ToString();
       

调用方法从此块中注册UriWithService(pushChannelUri)。

【讨论】：

是的，我已经完成了相同的过程..从 else 块调用了 RegisterUriWithService。它对我来说很好......谢谢......