如何在基于 Silverlight 的本地应用程序之间实现通信

http://msdn.microsoft.com/zh-cn/library/dd833075(VS.95).aspx

在两个Silverlight应用间数据通信(包括与Flash通信)

如何在基于 Silverlight 的本地应用程序之间实现通信

下面的代码示例演示如何使用 LocalMessageSender 和 LocalMessageReceiver 类。

在 XAML 中，Receiver 类定义 TextBlock 以便显示它接收的消息。Sender 类定义 Button 以便发送消息，并且定义 TextBlock 以便显示它接收的响应。

在代码隐藏中，Receiver 类初始化 LocalMessageReceiver 并处理 MessageReceived 事件。Sender 类初始化 LocalMessageSender 并为发送消息提供自定义处理。这使得发送器可以反复发送消息，直到接收器响应。这在某些情况下很有用，例如在接收应用程序的加载时间较长时。

发送器将尝试次数随消息一起传递到 SendAsync(String, Object) 方法调用。在接收器最终响应时，发送器将该尝试次数与响应一起显示。

该 HTML 示例承载发送应用程序的两个副本和接收应用程序的一个副本。这说明接收器可以接收来自多个发送器的消息。

 

using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Messaging;

namespace SendingApplication
{
    public partial class Sender : UserControl
    {
        private LocalMessageSender messageSender;

        public Sender()
        {
            InitializeComponent();
            UpdateButton();
            messageSender = new LocalMessageSender(
                "receiver", LocalMessageSender.Global);
            messageSender.SendCompleted += sender_SendCompleted;
            SendMessage("message from Sender constructor");
        }

        private int clickNumber = 1;

        private void UpdateButton()
        {
            button.Content = "send message 'click " + clickNumber + "'";
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            SendMessage("click " + clickNumber);
            clickNumber++;
            UpdateButton();
        }

        private const int MAX_ATTEMPTS = 10000;
        private int attempt = 1;

        private void SendMessage(string message)
        {
            messageSender.SendAsync(message, attempt);
        }

        private void sender_SendCompleted(object sender, SendCompletedEventArgs e)
        {
            if (e.Error != null)
            {
                LogError(e);
                attempt++;
                if (attempt > MAX_ATTEMPTS)
                {
                    output.Text = "Could not send message.";
                    return;
                }
                SendMessage(e.Message);
                return;
            }

            output.Text =
                "Message: " + e.Message + Environment.NewLine +
                "Attempt " + (int)e.UserState + 
                " completed." + Environment.NewLine +
                "Response: " + e.Response + Environment.NewLine +
                "ReceiverName: " + e.ReceiverName + Environment.NewLine + 
                "ReceiverDomain: " + e.ReceiverDomain;

            // Reset attempt counter.
            attempt = 1;
        }

        private void LogError(SendCompletedEventArgs e)
        {
            System.Diagnostics.Debug.WriteLine(
                "Attempt number {0}: {1}: {2}", (int)e.UserState, 
                e.Error.GetType().ToString(), e.Error.Message);
        }

    }
}


 

 

using System;
using System.Windows.Controls;
using System.Windows.Messaging;

namespace ReceivingApplication
{
    public partial class Receiver : UserControl
    {
        public Receiver()
        {
            InitializeComponent();

            LocalMessageReceiver messageReceiver =
                new LocalMessageReceiver("receiver",
                ReceiverNameScope.Global, LocalMessageReceiver.AnyDomain);
            messageReceiver.MessageReceived += messageReceiver_MessageReceived;
            try
            {
                messageReceiver.Listen();
            }
            catch (ListenFailedException)
            {
                output.Text = "Cannot receive messages." + Environment.NewLine +
                    "There is already a receiver with the name 'receiver'.";
            }
        }

        private void messageReceiver_MessageReceived(
            object sender, MessageReceivedEventArgs e)
        {
            e.Response = "response to " + e.Message;
            output.Text =
                "Message: " + e.Message + Environment.NewLine +
                "NameScope: " + e.NameScope + Environment.NewLine +
                "ReceiverName: " + e.ReceiverName + Environment.NewLine +
                "SenderDomain: " + e.SenderDomain + Environment.NewLine +
                "Response: " + e.Response;
        }
    }
}

 

 

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html  >
<!-- saved from url=(0014)about:internet -->
<head>
  <title>LocalMessaging</title>

  <style type="text/css">
  html, body {
    height: 100%;
    overflow: auto;
  }
  body {
    padding: 0;
    margin: 0;
  }
  #silverlightControlHost1 {
    padding: 0;
    margin: 0;
  }
  #silverlightControlHost2 {
    padding: 0;
    margin: 0;
  }
  </style>
</head>

<body>
  <table border="10" cellpadding="10" cellspacing="10">
    <tr>
      <td>
        <div id="silverlightControlHost1">
          <object data="data:application/x-silverlight-2," 
            type="application/x-silverlight-2" 
            width="400" height="120">
            <param name="source" value="ClientBin/SendingApplication.xap"/>
            <param name="onerror" value="onSilverlightError" />
            <param name="background" value="white" />
          </object>
          <iframe style='visibility:hidden;height:0;width:0;border:0px'>
          </iframe>
        </div>
      </td>
    </tr>
    <tr>
      <td>
        <div id="Div1">
          <object data="data:application/x-silverlight-2," 
            type="application/x-silverlight-2" 
            width="400" height="120">
            <param name="source" value="ClientBin/SendingApplication.xap"/>
            <param name="onerror" value="onSilverlightError" />
            <param name="background" value="white" />
          </object>
          <iframe style='visibility:hidden;height:0;width:0;border:0px'>
          </iframe>
        </div>
      </td>
    </tr>
    <tr>
      <td>
        <div id="silverlightControlHost2">
          <object data="data:application/x-silverlight-2," 
            type="application/x-silverlight-2" 
            width="400" height="120">
            <param name="source" value="ClientBin/ReceivingApplication.xap"/>
            <param name="onerror" value="onSilverlightError" />
            <param name="background" value="white" />
          </object>
          <iframe style='visibility:hidden;height:0;width:0;border:0px'>
          </iframe>
        </div>
      </td>
    </tr>
  </table>
</body>
</html>