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VS2010 C# 你得学会并且学得会的Socket编程基础知识(Silverlight Socket编程)

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这一篇文章，我将图文并茂地介绍Socket编程的基础知识，我相信，如果你按照步骤做完实验，一定可以对Socket编程有更好地理解。

本文源代码，可以通过这里下载 http://files.cnblogs.com/chenxizhang/SocketWorkshop.rar

 

第一步：创建解决方案

image

第二步：创建服务端程序

这里可以选择“Console Application”这个类型，比较方便调试

image

然后编写如下代码，实现服务器的基本功能

<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Collections.Generic;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Linq;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Text;<span class="rem" style="color: rgb(0, 128, 0); ">//额外导入的两个命名空间</span><span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Net.Sockets;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Net;<span class="kwrd" style="color: rgb(0, 0, 255); ">namespace</span> SocketServer{    <span class="kwrd" style="color: rgb(0, 0, 255); ">class</span> Program    {        <span class="rem" style="color: rgb(0, 128, 0); ">/// <summary></span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// Socket Server 演示</span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// 作者：陈希章</span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// </summary></span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// <param name="args"></param></span>        <span class="kwrd" style="color: rgb(0, 0, 255); ">static</span> <span class="kwrd" style="color: rgb(0, 0, 255); ">void</span> Main(<span class="kwrd" style="color: rgb(0, 0, 255); ">string</span>[] args)        {            <span class="rem" style="color: rgb(0, 128, 0); ">//创建一个新的Socket,这里我们使用最常用的基于TCP的Stream Socket（流式套接字）</span>            var socket = <span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);            <span class="rem" style="color: rgb(0, 128, 0); ">//将该socket绑定到主机上面的某个端口</span>            <span class="rem" style="color: rgb(0, 128, 0); ">//方法参考：http://msdn.microsoft.com/zh-cn/library/system.net.sockets.socket.bind.aspx</span>            socket.Bind(<span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> IPEndPoint(IPAddress.Any, 4530));            <span class="rem" style="color: rgb(0, 128, 0); ">//启动监听，并且设置一个最大的队列长度</span>            <span class="rem" style="color: rgb(0, 128, 0); ">//方法参考：http://msdn.microsoft.com/zh-cn/library/system.net.sockets.socket.listen(v=VS.100).aspx</span>            socket.Listen(4);            Console.WriteLine(<span class="str" style="color: rgb(0, 96, 128); ">"Server is ready!"</span>);            Console.Read();        }    }}

 

现在可以启动调试一下看看效果如何，正常情况下应该会看到一个提示，因为我们需要在TCP 4530端口进行监听，所以防火墙会有提示。

image

点击“Allow access”

image

这样，我们的服务器就可以开始监听了。但是这有什么用呢？是的，没有什么用。

我们还需要为服务器添加一些功能，例如接受传入的请求，给客户端发送消息，或者从客户端接收消息等等

第三步：接受传入的请求

我们需要通过Accept，或者(BeginAccept)来接受传入的请求，请注意下面代码中的红色部分

 

<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Collections.Generic;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Linq;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Text;<span class="rem" style="color: rgb(0, 128, 0); ">//额外导入的两个命名空间</span><span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Net.Sockets;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Net;<span class="kwrd" style="color: rgb(0, 0, 255); ">namespace</span> SocketServer{    <span class="kwrd" style="color: rgb(0, 0, 255); ">class</span> Program    {        <span class="rem" style="color: rgb(0, 128, 0); ">/// <summary></span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// Socket Server 演示</span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// 作者：陈希章</span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// </summary></span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// <param name="args"></param></span>        <span class="kwrd" style="color: rgb(0, 0, 255); ">static</span> <span class="kwrd" style="color: rgb(0, 0, 255); ">void</span> Main(<span class="kwrd" style="color: rgb(0, 0, 255); ">string</span>[] args)        {            <span class="rem" style="color: rgb(0, 128, 0); ">//创建一个新的Socket,这里我们使用最常用的基于TCP的Stream Socket（流式套接字）</span>            var socket = <span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);            <span class="rem" style="color: rgb(0, 128, 0); ">//将该socket绑定到主机上面的某个端口</span>            <span class="rem" style="color: rgb(0, 128, 0); ">//方法参考：http://msdn.microsoft.com/zh-cn/library/system.net.sockets.socket.bind.aspx</span>            socket.Bind(<span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> IPEndPoint(IPAddress.Any, 4530));            <span class="rem" style="color: rgb(0, 128, 0); ">//启动监听，并且设置一个最大的队列长度</span>            <span class="rem" style="color: rgb(0, 128, 0); ">//方法参考：http://msdn.microsoft.com/zh-cn/library/system.net.sockets.socket.listen(v=VS.100).aspx</span>            socket.Listen(4);<strong><span style="color: rgb(255, 0, 0); ">            <span class="rem" style="color: rgb(0, 128, 0); ">//开始接受客户端连接请求</span>            <span class="rem" style="color: rgb(0, 128, 0); ">//方法参考：http://msdn.microsoft.com/zh-cn/library/system.net.sockets.socket.beginaccept.aspx</span>            socket.BeginAccept(<span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> AsyncCallback((ar) =>            {                <span class="rem" style="color: rgb(0, 128, 0); ">//这就是客户端的Socket实例，我们后续可以将其保存起来</span>                var client = socket.EndAccept(ar);                <span class="rem" style="color: rgb(0, 128, 0); ">//给客户端发送一个欢迎消息</span>                client.Send(Encoding.Unicode.GetBytes(<span class="str" style="color: rgb(0, 96, 128); ">"Hi there, I accept you request at "</span>+DateTime.Now.ToString()));            }), <span class="kwrd" style="color: rgb(0, 0, 255); ">null</span>);</span></strong>            Console.WriteLine(<span class="str" style="color: rgb(0, 96, 128); ">"Server is ready!"</span>);            Console.Read();        }    }}

 

wow，看起来不错对吧，我们赶紧做一个客户端来测试一下吧

 

第四步：创建客户端

我们还是使用一个Console Application

image

添加如下的代码，并且创建客户端连接

<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Collections.Generic;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Linq;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Text;<span class="rem" style="color: rgb(0, 128, 0); ">//导入的命名空间</span><span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Net.Sockets;<span class="kwrd" style="color: rgb(0, 0, 255); ">namespace</span> SocketClient{    <span class="kwrd" style="color: rgb(0, 0, 255); ">class</span> Program    {        <span class="rem" style="color: rgb(0, 128, 0); ">/// <summary></span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// Socket Server 演示</span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// 作者：陈希章</span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// </summary></span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// <param name="args"></param></span>        <span class="kwrd" style="color: rgb(0, 0, 255); ">static</span> <span class="kwrd" style="color: rgb(0, 0, 255); ">void</span> Main(<span class="kwrd" style="color: rgb(0, 0, 255); ">string</span>[] args)        {            <span class="rem" style="color: rgb(0, 128, 0); ">//创建一个Socket</span>            var socket = <span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);            <span class="rem" style="color: rgb(0, 128, 0); ">//连接到指定服务器的指定端口</span>            <span class="rem" style="color: rgb(0, 128, 0); ">//方法参考：http://msdn.microsoft.com/zh-cn/library/system.net.sockets.socket.connect.aspx</span>            socket.Connect(<span class="str" style="color: rgb(0, 96, 128); ">"localhost"</span>, 4530);            Console.WriteLine(<span class="str" style="color: rgb(0, 96, 128); ">"connect to the server"</span>);            Console.Read();        }    }}

依次选择SocketServer和SocketClient这两个项目，分别将其启动为调试状态（右键菜单，Debug=>Start new instance)

image

我们看到两个程序都工作正常。

但是，在客户端怎么没有收到服务器发过来的消息呢？那是因为，我们没有在客户端提供这方面的功能。

 

第五步：在客户端中实现接受消息的方法

<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Collections.Generic;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Linq;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Text;<span class="rem" style="color: rgb(0, 128, 0); ">//导入的命名空间</span><span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Net.Sockets;<span class="kwrd" style="color: rgb(0, 0, 255); ">namespace</span> SocketClient{    <span class="kwrd" style="color: rgb(0, 0, 255); ">class</span> Program    {        <span class="rem" style="color: rgb(0, 128, 0); ">/// <summary></span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// Socket Server 演示</span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// 作者：陈希章</span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// </summary></span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// <param name="args"></param></span>        <span class="kwrd" style="color: rgb(0, 0, 255); ">static</span> <span class="kwrd" style="color: rgb(0, 0, 255); ">void</span> Main(<span class="kwrd" style="color: rgb(0, 0, 255); ">string</span>[] args)        {            <span class="rem" style="color: rgb(0, 128, 0); ">//创建一个Socket</span>            var socket = <span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);            <span class="rem" style="color: rgb(0, 128, 0); ">//连接到指定服务器的指定端口</span>            <span class="rem" style="color: rgb(0, 128, 0); ">//方法参考：http://msdn.microsoft.com/zh-cn/library/system.net.sockets.socket.connect.aspx</span>            socket.Connect(<span class="str" style="color: rgb(0, 96, 128); ">"localhost"</span>, 4530);            <span class="rem" style="color: rgb(0, 128, 0); ">//实现接受消息的方法</span><strong><span style="color: rgb(255, 0, 0); ">            var buffer = <span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> <span class="kwrd" style="color: rgb(0, 0, 255); ">byte</span>[1024];<span class="rem" style="color: rgb(0, 128, 0); ">//设置一个缓冲区，用来保存数据</span>            <span class="rem" style="color: rgb(0, 128, 0); ">//方法参考：http://msdn.microsoft.com/zh-cn/library/system.net.sockets.socket.beginreceive.aspx</span>            socket.BeginReceive(buffer, 0, buffer.Length, SocketFlags.None, <span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> AsyncCallback((ar) =>            {                <span class="rem" style="color: rgb(0, 128, 0); ">//方法参考：http://msdn.microsoft.com/zh-cn/library/system.net.sockets.socket.endreceive.aspx</span>                var length = socket.EndReceive(ar);                <span class="rem" style="color: rgb(0, 128, 0); ">//读取出来消息内容</span>                var message = Encoding.Unicode.GetString(buffer, 0, length);                <span class="rem" style="color: rgb(0, 128, 0); ">//显示消息</span>                Console.WriteLine(message);            }), <span class="kwrd" style="color: rgb(0, 0, 255); ">null</span>);</span></strong>            Console.WriteLine(<span class="str" style="color: rgb(0, 96, 128); ">"connect to the server"</span>);            Console.Read();        }    }}

请注意以上红色的部分，我们用了BeginReceive方法进行异步的消息侦听，如果收到了，我们就打印出来

image

看起来已经实现了我们需求了：服务器给客户端发了一个消息，而客户端也已经收到了。

但是，这远远不够，因为它们之间的通讯不仅仅是一次性的，那么如果服务器要不断地给客户端发消息，例如每隔两秒钟就发送一个消息，如何实现呢？

 

第六步：实现服务器定期向客户端发消息

<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Collections.Generic;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Linq;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Text;<span class="rem" style="color: rgb(0, 128, 0); ">//额外导入的两个命名空间</span><span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Net.Sockets;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Net;<span class="kwrd" style="color: rgb(0, 0, 255); ">namespace</span> SocketServer{    <span class="kwrd" style="color: rgb(0, 0, 255); ">class</span> Program    {        <span class="rem" style="color: rgb(0, 128, 0); ">/// <summary></span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// Socket Server 演示</span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// 作者：陈希章</span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// </summary></span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// <param name="args"></param></span>        <span class="kwrd" style="color: rgb(0, 0, 255); ">static</span> <span class="kwrd" style="color: rgb(0, 0, 255); ">void</span> Main(<span class="kwrd" style="color: rgb(0, 0, 255); ">string</span>[] args)        {            <span class="rem" style="color: rgb(0, 128, 0); ">//创建一个新的Socket,这里我们使用最常用的基于TCP的Stream Socket（流式套接字）</span>            var socket = <span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);            <span class="rem" style="color: rgb(0, 128, 0); ">//将该socket绑定到主机上面的某个端口</span>            <span class="rem" style="color: rgb(0, 128, 0); ">//方法参考：http://msdn.microsoft.com/zh-cn/library/system.net.sockets.socket.bind.aspx</span>            socket.Bind(<span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> IPEndPoint(IPAddress.Any, 4530));            <span class="rem" style="color: rgb(0, 128, 0); ">//启动监听，并且设置一个最大的队列长度</span>            <span class="rem" style="color: rgb(0, 128, 0); ">//方法参考：http://msdn.microsoft.com/zh-cn/library/system.net.sockets.socket.listen(v=VS.100).aspx</span>            socket.Listen(4);            <span class="rem" style="color: rgb(0, 128, 0); ">//开始接受客户端连接请求</span>            <span class="rem" style="color: rgb(0, 128, 0); ">//方法参考：http://msdn.microsoft.com/zh-cn/library/system.net.sockets.socket.beginaccept.aspx</span>            socket.BeginAccept(<span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> AsyncCallback((ar) =>            {                <span class="rem" style="color: rgb(0, 128, 0); ">//这就是客户端的Socket实例，我们后续可以将其保存起来</span>                var client = socket.EndAccept(ar);                <span class="rem" style="color: rgb(0, 128, 0); ">//给客户端发送一个欢迎消息</span>                client.Send(Encoding.Unicode.GetBytes(<span class="str" style="color: rgb(0, 96, 128); ">"Hi there, I accept you request at "</span>+DateTime.Now.ToString()));<strong><span style="color: rgb(255, 0, 0); ">                <span class="rem" style="color: rgb(0, 128, 0); ">//实现每隔两秒钟给服务器发一个消息</span>                <span class="rem" style="color: rgb(0, 128, 0); ">//这里我们使用了一个定时器</span>                var timer = <span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> System.Timers.Timer();                timer.Interval = 2000D;                timer.Enabled = <span class="kwrd" style="color: rgb(0, 0, 255); ">true</span>;                timer.Elapsed += (o, a) =>                {                    client.Send(Encoding.Unicode.GetBytes(<span class="str" style="color: rgb(0, 96, 128); ">"Message from server at "</span> +DateTime.Now.ToString()));                };                timer.Start();</span></strong>            }), <span class="kwrd" style="color: rgb(0, 0, 255); ">null</span>);            Console.WriteLine(<span class="str" style="color: rgb(0, 96, 128); ">"Server is ready!"</span>);            Console.Read();        }    }}

 

我们还要实现在客户端一直监听消息的机制，而不是一次性接收.请注意下面红色的部分

 

<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Collections.Generic;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Linq;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Text;<span class="rem" style="color: rgb(0, 128, 0); ">//导入的命名空间</span><span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Net.Sockets;<span class="kwrd" style="color: rgb(0, 0, 255); ">namespace</span> SocketClient{    <span class="kwrd" style="color: rgb(0, 0, 255); ">class</span> Program    {        <span class="rem" style="color: rgb(0, 128, 0); ">/// <summary></span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// Socket Server 演示</span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// 作者：陈希章</span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// </summary></span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// <param name="args"></param></span>        <span class="kwrd" style="color: rgb(0, 0, 255); ">static</span> <span class="kwrd" style="color: rgb(0, 0, 255); ">void</span> Main(<span class="kwrd" style="color: rgb(0, 0, 255); ">string</span>[] args)        {            <span class="rem" style="color: rgb(0, 128, 0); ">//创建一个Socket</span>            var socket = <span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);            <span class="rem" style="color: rgb(0, 128, 0); ">//连接到指定服务器的指定端口</span>            <span class="rem" style="color: rgb(0, 128, 0); ">//方法参考：http://msdn.microsoft.com/zh-cn/library/system.net.sockets.socket.connect.aspx</span>            socket.Connect(<span class="str" style="color: rgb(0, 96, 128); ">"localhost"</span>, 4530);            Console.WriteLine(<span class="str" style="color: rgb(0, 96, 128); ">"connect to the server"</span>);            <span class="rem" style="color: rgb(0, 128, 0); ">//实现接受消息的方法</span>            <span class="rem" style="color: rgb(0, 128, 0); ">//方法参考：http://msdn.microsoft.com/zh-cn/library/system.net.sockets.socket.beginreceive.aspx</span>           <strong><span style="color: rgb(255, 0, 0); "> socket.BeginReceive(buffer, 0, buffer.Length, SocketFlags.None, <span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> AsyncCallback(ReceiveMessage),socket);</span></strong>            Console.Read();        }<span style="color: rgb(255, 0, 0); "><strong>        <span class="kwrd" style="color: rgb(0, 0, 255); ">static</span> <span class="kwrd" style="color: rgb(0, 0, 255); ">byte</span>[] buffer = <span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> <span class="kwrd" style="color: rgb(0, 0, 255); ">byte</span>[1024];        <span class="kwrd" style="color: rgb(0, 0, 255); ">public</span> <span class="kwrd" style="color: rgb(0, 0, 255); ">static</span> <span class="kwrd" style="color: rgb(0, 0, 255); ">void</span> ReceiveMessage(IAsyncResult ar)        {            <span class="kwrd" style="color: rgb(0, 0, 255); ">try</span>            {                var socket = ar.AsyncState <span class="kwrd" style="color: rgb(0, 0, 255); ">as</span> Socket;                <span class="rem" style="color: rgb(0, 128, 0); ">//方法参考：http://msdn.microsoft.com/zh-cn/library/system.net.sockets.socket.endreceive.aspx</span>                var length = socket.EndReceive(ar);                <span class="rem" style="color: rgb(0, 128, 0); ">//读取出来消息内容</span>                var message = Encoding.Unicode.GetString(buffer, 0, length);                <span class="rem" style="color: rgb(0, 128, 0); ">//显示消息</span>                Console.WriteLine(message);                <span class="rem" style="color: rgb(0, 128, 0); ">//接收下一个消息(因为这是一个递归的调用，所以这样就可以一直接收消息了）</span>                socket.BeginReceive(buffer, 0, buffer.Length, SocketFlags.None, <span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> AsyncCallback(ReceiveMessage), socket);            }            <span class="kwrd" style="color: rgb(0, 0, 255); ">catch</span>(Exception ex){                Console.WriteLine(ex.Message);            }        }</strong></span>    }}

重新调试起来，看起来的效果如下图所示

image

我们继续做下面的实验，一步一步地研究Socket通讯中可能遇到的一些问题

请先关闭掉客户端这个程序，而不要关闭服务端程序，这时会发现一个错误

image

这个错误很容易理解，因为客户端已经关闭，也就是客户端那个Socket已经不存在了，服务器还继续向它发送消息当然会出错。所以，从可靠性方面的考虑，我们必须在发送消息之前检测Socket的活动状态

 

第七步：检测客户端的活动状态

<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Collections.Generic;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Linq;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Text;<span class="rem" style="color: rgb(0, 128, 0); ">//额外导入的两个命名空间</span><span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Net.Sockets;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Net;<span class="kwrd" style="color: rgb(0, 0, 255); ">namespace</span> SocketServer{    <span class="kwrd" style="color: rgb(0, 0, 255); ">class</span> Program    {        <span class="rem" style="color: rgb(0, 128, 0); ">/// <summary></span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// Socket Server 演示</span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// 作者：陈希章</span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// </summary></span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// <param name="args"></param></span>        <span class="kwrd" style="color: rgb(0, 0, 255); ">static</span> <span class="kwrd" style="color: rgb(0, 0, 255); ">void</span> Main(<span class="kwrd" style="color: rgb(0, 0, 255); ">string</span>[] args)        {            <span class="rem" style="color: rgb(0, 128, 0); ">//创建一个新的Socket,这里我们使用最常用的基于TCP的Stream Socket（流式套接字）</span>            var socket = <span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);            <span class="rem" style="color: rgb(0, 128, 0); ">//将该socket绑定到主机上面的某个端口</span>            <span class="rem" style="color: rgb(0, 128, 0); ">//方法参考：http://msdn.microsoft.com/zh-cn/library/system.net.sockets.socket.bind.aspx</span>            socket.Bind(<span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> IPEndPoint(IPAddress.Any, 4530));            <span class="rem" style="color: rgb(0, 128, 0); ">//启动监听，并且设置一个最大的队列长度</span>            <span class="rem" style="color: rgb(0, 128, 0); ">//方法参考：http://msdn.microsoft.com/zh-cn/library/system.net.sockets.socket.listen(v=VS.100).aspx</span>            socket.Listen(4);            <span class="rem" style="color: rgb(0, 128, 0); ">//开始接受客户端连接请求</span>            <span class="rem" style="color: rgb(0, 128, 0); ">//方法参考：http://msdn.microsoft.com/zh-cn/library/system.net.sockets.socket.beginaccept.aspx</span>            socket.BeginAccept(<span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> AsyncCallback((ar) =>            {                <span class="rem" style="color: rgb(0, 128, 0); ">//这就是客户端的Socket实例，我们后续可以将其保存起来</span>                var client = socket.EndAccept(ar);                <span class="rem" style="color: rgb(0, 128, 0); ">//给客户端发送一个欢迎消息</span>                client.Send(Encoding.Unicode.GetBytes(<span class="str" style="color: rgb(0, 96, 128); ">"Hi there, I accept you request at "</span>+DateTime.Now.ToString()));                <span class="rem" style="color: rgb(0, 128, 0); ">//实现每隔两秒钟给服务器发一个消息</span>                <span class="rem" style="color: rgb(0, 128, 0); ">//这里我们使用了一个定时器</span>                var timer = <span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> System.Timers.Timer();                timer.Interval = 2000D;                timer.Enabled = <span class="kwrd" style="color: rgb(0, 0, 255); ">true</span>;                timer.Elapsed += (o, a) =>                {<strong><span style="color: rgb(255, 0, 0); ">                    <span class="rem" style="color: rgb(0, 128, 0); ">//检测客户端Socket的状态</span>                    <span class="kwrd" style="color: rgb(0, 0, 255); ">if</span>(client.Connected)                    {                        <span class="kwrd" style="color: rgb(0, 0, 255); ">try</span>                        {                            client.Send(Encoding.Unicode.GetBytes(<span class="str" style="color: rgb(0, 96, 128); ">"Message from server at "</span> + DateTime.Now.ToString()));                        }                        <span class="kwrd" style="color: rgb(0, 0, 255); ">catch</span>(SocketException ex)                        {                            Console.WriteLine(ex.Message);                        }                    }                    <span class="kwrd" style="color: rgb(0, 0, 255); ">else</span>                    {                        timer.Stop();                        timer.Enabled = <span class="kwrd" style="color: rgb(0, 0, 255); ">false</span>;                        Console.WriteLine(<span class="str" style="color: rgb(0, 96, 128); ">"Client is disconnected, the timer is stop."</span>);                    }</span></strong>                };                timer.Start();            }), <span class="kwrd" style="color: rgb(0, 0, 255); ">null</span>);            Console.WriteLine(<span class="str" style="color: rgb(0, 96, 128); ">"Server is ready!"</span>);            Console.Read();        }    }}

上面代码的逻辑很清楚，但有时候还是会触发那个SocketException。为什么呢？这是因为我们的Timer是每隔两秒钟检查一次，那么就很可能有一种情况，我们检查的时候，它还是连接状态，消息发出去之后，它断开了。这种情况肯定是存在的。所以要用Try..catch的结构

 

目前我们实现的场景很简单，服务器只管发消息，客户端只管收消息。但实际工作中，可能希望服务器和客户端都能收发消息。请看下一节

 

第八步：实现双向收发消息

先看服务端的修改

 

<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Collections.Generic;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Linq;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Text;<span class="rem" style="color: rgb(0, 128, 0); ">//额外导入的两个命名空间</span><span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Net.Sockets;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Net;<span class="kwrd" style="color: rgb(0, 0, 255); ">namespace</span> SocketServer{    <span class="kwrd" style="color: rgb(0, 0, 255); ">class</span> Program    {        <span class="rem" style="color: rgb(0, 128, 0); ">/// <summary></span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// Socket Server 演示</span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// 作者：陈希章</span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// </summary></span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// <param name="args"></param></span>        <span class="kwrd" style="color: rgb(0, 0, 255); ">static</span> <span class="kwrd" style="color: rgb(0, 0, 255); ">void</span> Main(<span class="kwrd" style="color: rgb(0, 0, 255); ">string</span>[] args)        {            <span class="rem" style="color: rgb(0, 128, 0); ">//创建一个新的Socket,这里我们使用最常用的基于TCP的Stream Socket（流式套接字）</span>            var socket = <span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);            <span class="rem" style="color: rgb(0, 128, 0); ">//将该socket绑定到主机上面的某个端口</span>            <span class="rem" style="color: rgb(0, 128, 0); ">//方法参考：http://msdn.microsoft.com/zh-cn/library/system.net.sockets.socket.bind.aspx</span>            socket.Bind(<span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> IPEndPoint(IPAddress.Any, 4530));            <span class="rem" style="color: rgb(0, 128, 0); ">//启动监听，并且设置一个最大的队列长度</span>            <span class="rem" style="color: rgb(0, 128, 0); ">//方法参考：http://msdn.microsoft.com/zh-cn/library/system.net.sockets.socket.listen(v=VS.100).aspx</span>            socket.Listen(4);            <span class="rem" style="color: rgb(0, 128, 0); ">//开始接受客户端连接请求</span>            <span class="rem" style="color: rgb(0, 128, 0); ">//方法参考：http://msdn.microsoft.com/zh-cn/library/system.net.sockets.socket.beginaccept.aspx</span>            socket.BeginAccept(<span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> AsyncCallback((ar) =>            {                <span class="rem" style="color: rgb(0, 128, 0); ">//这就是客户端的Socket实例，我们后续可以将其保存起来</span>                var client = socket.EndAccept(ar);                <span class="rem" style="color: rgb(0, 128, 0); ">//给客户端发送一个欢迎消息</span>                client.Send(Encoding.Unicode.GetBytes(<span class="str" style="color: rgb(0, 96, 128); ">"Hi there, I accept you request at "</span>+DateTime.Now.ToString()));                <span class="rem" style="color: rgb(0, 128, 0); ">//实现每隔两秒钟给服务器发一个消息</span>                <span class="rem" style="color: rgb(0, 128, 0); ">//这里我们使用了一个定时器</span>                var timer = <span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> System.Timers.Timer();                timer.Interval = 2000D;                timer.Enabled = <span class="kwrd" style="color: rgb(0, 0, 255); ">true</span>;                timer.Elapsed += (o, a) =>                {                    <span class="rem" style="color: rgb(0, 128, 0); ">//检测客户端Socket的状态</span>                    <span class="kwrd" style="color: rgb(0, 0, 255); ">if</span>(client.Connected)                    {                        <span class="kwrd" style="color: rgb(0, 0, 255); ">try</span>                        {                            client.Send(Encoding.Unicode.GetBytes(<span class="str" style="color: rgb(0, 96, 128); ">"Message from server at "</span> + DateTime.Now.ToString()));                        }                        <span class="kwrd" style="color: rgb(0, 0, 255); ">catch</span>(SocketException ex)                        {                            Console.WriteLine(ex.Message);                        }                    }                    <span class="kwrd" style="color: rgb(0, 0, 255); ">else</span>                    {                        timer.Stop();                        timer.Enabled = <span class="kwrd" style="color: rgb(0, 0, 255); ">false</span>;                        Console.WriteLine(<span class="str" style="color: rgb(0, 96, 128); ">"Client is disconnected, the timer is stop."</span>);                    }                };                timer.Start();  <strong><span style="color: rgb(255, 0, 0); ">              <span class="rem" style="color: rgb(0, 128, 0); ">//接收客户端的消息(这个和在客户端实现的方式是一样的）</span>                client.BeginReceive(buffer,0,buffer.Length,SocketFlags.None,<span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> AsyncCallback(ReceiveMessage),client);</span></strong>            }), <span class="kwrd" style="color: rgb(0, 0, 255); ">null</span>);            Console.WriteLine(<span class="str" style="color: rgb(0, 96, 128); ">"Server is ready!"</span>);            Console.Read();        }<strong><span style="color: rgb(255, 0, 0); ">        <span class="kwrd" style="color: rgb(0, 0, 255); ">static</span> <span class="kwrd" style="color: rgb(0, 0, 255); ">byte</span>[] buffer = <span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> <span class="kwrd" style="color: rgb(0, 0, 255); ">byte</span>[1024];        <span class="kwrd" style="color: rgb(0, 0, 255); ">public</span> <span class="kwrd" style="color: rgb(0, 0, 255); ">static</span> <span class="kwrd" style="color: rgb(0, 0, 255); ">void</span> ReceiveMessage(IAsyncResult ar)        {            <span class="kwrd" style="color: rgb(0, 0, 255); ">try</span>            {                var socket = ar.AsyncState <span class="kwrd" style="color: rgb(0, 0, 255); ">as</span> Socket;                <span class="rem" style="color: rgb(0, 128, 0); ">//方法参考：http://msdn.microsoft.com/zh-cn/library/system.net.sockets.socket.endreceive.aspx</span>                var length = socket.EndReceive(ar);                <span class="rem" style="color: rgb(0, 128, 0); ">//读取出来消息内容</span>                var message = Encoding.Unicode.GetString(buffer, 0, length);                <span class="rem" style="color: rgb(0, 128, 0); ">//显示消息</span>                Console.WriteLine(message);                <span class="rem" style="color: rgb(0, 128, 0); ">//接收下一个消息(因为这是一个递归的调用，所以这样就可以一直接收消息了）</span>                socket.BeginReceive(buffer, 0, buffer.Length, SocketFlags.None, <span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> AsyncCallback(ReceiveMessage), socket);            }            <span class="kwrd" style="color: rgb(0, 0, 255); ">catch</span>(Exception ex){                Console.WriteLine(ex.Message);            }        }</span></strong>    }}

可以看出来，为了让服务器可以接受消息，其实并不需要什么特别的设计，与客户端接受消息其实可以是一样的

 

再来看看客户端的修改

<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Collections.Generic;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Linq;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Text;<span class="rem" style="color: rgb(0, 128, 0); ">//导入的命名空间</span><span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Net.Sockets;<span class="kwrd" style="color: rgb(0, 0, 255); ">namespace</span> SocketClient{    <span class="kwrd" style="color: rgb(0, 0, 255); ">class</span> Program    {        <span class="rem" style="color: rgb(0, 128, 0); ">/// <summary></span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// Socket Server 演示</span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// 作者：陈希章</span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// </summary></span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// <param name="args"></param></span>        <span class="kwrd" style="color: rgb(0, 0, 255); ">static</span> <span class="kwrd" style="color: rgb(0, 0, 255); ">void</span> Main(<span class="kwrd" style="color: rgb(0, 0, 255); ">string</span>[] args)        {            <span class="rem" style="color: rgb(0, 128, 0); ">//创建一个Socket</span>            var socket = <span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);            <span class="rem" style="color: rgb(0, 128, 0); ">//连接到指定服务器的指定端口</span>            <span class="rem" style="color: rgb(0, 128, 0); ">//方法参考：http://msdn.microsoft.com/zh-cn/library/system.net.sockets.socket.connect.aspx</span>            socket.Connect(<span class="str" style="color: rgb(0, 96, 128); ">"localhost"</span>, 4530);            Console.WriteLine(<span class="str" style="color: rgb(0, 96, 128); ">"connect to the server"</span>);            <span class="rem" style="color: rgb(0, 128, 0); ">//实现接受消息的方法</span>            <span class="rem" style="color: rgb(0, 128, 0); ">//方法参考：http://msdn.microsoft.com/zh-cn/library/system.net.sockets.socket.beginreceive.aspx</span>            socket.BeginReceive(buffer, 0, buffer.Length, SocketFlags.None, <span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> AsyncCallback(ReceiveMessage), socket);<strong><span style="color: rgb(255, 0, 0); ">            <span class="rem" style="color: rgb(0, 128, 0); ">//接受用户输入，将消息发送给服务器端</span>            <span class="kwrd" style="color: rgb(0, 0, 255); ">while</span>(<span class="kwrd" style="color: rgb(0, 0, 255); ">true</span>)            {                var message = <span class="str" style="color: rgb(0, 96, 128); ">"Message from client : "</span> + Console.ReadLine();                var outputBuffer = Encoding.Unicode.GetBytes(message);                socket.BeginSend(outputBuffer, 0, outputBuffer.Length, SocketFlags.None, <span class="kwrd" style="color: rgb(0, 0, 255); ">null</span>, <span class="kwrd" style="color: rgb(0, 0, 255); ">null</span>);            }</span></strong>        }        <span class="kwrd" style="color: rgb(0, 0, 255); ">static</span> <span class="kwrd" style="color: rgb(0, 0, 255); ">byte</span>[] buffer = <span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> <span class="kwrd" style="color: rgb(0, 0, 255); ">byte</span>[1024];        <span class="kwrd" style="color: rgb(0, 0, 255); ">public</span> <span class="kwrd" style="color: rgb(0, 0, 255); ">static</span> <span class="kwrd" style="color: rgb(0, 0, 255); ">void</span> ReceiveMessage(IAsyncResult ar)        {            <span class="kwrd" style="color: rgb(0, 0, 255); ">try</span>            {                var socket = ar.AsyncState <span class="kwrd" style="color: rgb(0, 0, 255); ">as</span> Socket;                <span class="rem" style="color: rgb(0, 128, 0); ">//方法参考：http://msdn.microsoft.com/zh-cn/library/system.net.sockets.socket.endreceive.aspx</span>                var length = socket.EndReceive(ar);                <span class="rem" style="color: rgb(0, 128, 0); ">//读取出来消息内容</span>                var message = Encoding.Unicode.GetString(buffer, 0, length);                <span class="rem" style="color: rgb(0, 128, 0); ">//显示消息</span>                Console.WriteLine(message);                <span class="rem" style="color: rgb(0, 128, 0); ">//接收下一个消息(因为这是一个递归的调用，所以这样就可以一直接收消息了）</span>                socket.BeginReceive(buffer, 0, buffer.Length, SocketFlags.None, <span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> AsyncCallback(ReceiveMessage), socket);            }            <span class="kwrd" style="color: rgb(0, 0, 255); ">catch</span>(Exception ex)            {                Console.WriteLine(ex.Message);            }        }    }}

我在这里做了一个死循环，用户可以不断地输入，这些消息会被发送给服务器。如下图所示

image

【备注】因为服务器每隔两秒钟会发送新消息过来，所以在输入的时候，动作要稍快一点啦

 

本文最后探讨一个问题，就是如何让我们的服务器可以支持多个客户端

 

第九步：支持多个客户端

这个步骤只需要修改服务端程序即可

<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Collections.Generic;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Linq;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Text;<span class="rem" style="color: rgb(0, 128, 0); ">//额外导入的两个命名空间</span><span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Net.Sockets;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Net;<span class="kwrd" style="color: rgb(0, 0, 255); ">namespace</span> SocketServer{    <span class="kwrd" style="color: rgb(0, 0, 255); ">class</span> Program    {        <span class="rem" style="color: rgb(0, 128, 0); ">/// <summary></span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// Socket Server 演示</span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// 作者：陈希章</span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// </summary></span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// <param name="args"></param></span>        <span class="kwrd" style="color: rgb(0, 0, 255); ">static</span> <span class="kwrd" style="color: rgb(0, 0, 255); ">void</span> Main(<span class="kwrd" style="color: rgb(0, 0, 255); ">string</span>[] args)        {            <span class="rem" style="color: rgb(0, 128, 0); ">//创建一个新的Socket,这里我们使用最常用的基于TCP的Stream Socket（流式套接字）</span>            var socket = <span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);            <span class="rem" style="color: rgb(0, 128, 0); ">//将该socket绑定到主机上面的某个端口</span>            <span class="rem" style="color: rgb(0, 128, 0); ">//方法参考：http://msdn.microsoft.com/zh-cn/library/system.net.sockets.socket.bind.aspx</span>            socket.Bind(<span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> IPEndPoint(IPAddress.Any, 4530));            <span class="rem" style="color: rgb(0, 128, 0); ">//启动监听，并且设置一个最大的队列长度</span>            <span class="rem" style="color: rgb(0, 128, 0); ">//方法参考：http://msdn.microsoft.com/zh-cn/library/system.net.sockets.socket.listen(v=VS.100).aspx</span>            socket.Listen(4);            <span class="rem" style="color: rgb(0, 128, 0); ">//开始接受客户端连接请求</span>            <span class="rem" style="color: rgb(0, 128, 0); ">//方法参考：http://msdn.microsoft.com/zh-cn/library/system.net.sockets.socket.beginaccept.aspx</span>       <span style="color: rgb(255, 0, 0); "><strong>     socket.BeginAccept(<span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> AsyncCallback(ClientAccepted), socket);</strong></span>            Console.WriteLine(<span class="str" style="color: rgb(0, 96, 128); ">"Server is ready!"</span>);            Console.Read();        }<strong><span style="color: rgb(255, 0, 0); ">        <span class="kwrd" style="color: rgb(0, 0, 255); ">public</span> <span class="kwrd" style="color: rgb(0, 0, 255); ">static</span> <span class="kwrd" style="color: rgb(0, 0, 255); ">void</span> ClientAccepted(IAsyncResult ar)        {            var socket = ar.AsyncState <span class="kwrd" style="color: rgb(0, 0, 255); ">as</span> Socket;            <span class="rem" style="color: rgb(0, 128, 0); ">//这就是客户端的Socket实例，我们后续可以将其保存起来</span>            var client = socket.EndAccept(ar);            <span class="rem" style="color: rgb(0, 128, 0); ">//给客户端发送一个欢迎消息</span>            client.Send(Encoding.Unicode.GetBytes(<span class="str" style="color: rgb(0, 96, 128); ">"Hi there, I accept you request at "</span> + DateTime.Now.ToString()));            <span class="rem" style="color: rgb(0, 128, 0); ">//实现每隔两秒钟给服务器发一个消息</span>            <span class="rem" style="color: rgb(0, 128, 0); ">//这里我们使用了一个定时器</span>            var timer = <span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> System.Timers.Timer();            timer.Interval = 2000D;            timer.Enabled = <span class="kwrd" style="color: rgb(0, 0, 255); ">true</span>;            timer.Elapsed += (o, a) =>            {                <span class="rem" style="color: rgb(0, 128, 0); ">//检测客户端Socket的状态</span>                <span class="kwrd" style="color: rgb(0, 0, 255); ">if</span>(client.Connected)                {                    <span class="kwrd" style="color: rgb(0, 0, 255); ">try</span>                    {                        client.Send(Encoding.Unicode.GetBytes(<span class="str" style="color: rgb(0, 96, 128); ">"Message from server at "</span> + DateTime.Now.ToString()));                    }                    <span class="kwrd" style="color: rgb(0, 0, 255); ">catch</span>(SocketException ex)                    {                        Console.WriteLine(ex.Message);                    }                }                <span class="kwrd" style="color: rgb(0, 0, 255); ">else</span>                {                    timer.Stop();                    timer.Enabled = <span class="kwrd" style="color: rgb(0, 0, 255); ">false</span>;                    Console.WriteLine(<span class="str" style="color: rgb(0, 96, 128); ">"Client is disconnected, the timer is stop."</span>);                }            };            timer.Start();            <span class="rem" style="color: rgb(0, 128, 0); ">//接收客户端的消息(这个和在客户端实现的方式是一样的）</span>            client.BeginReceive(buffer, 0, buffer.Length, SocketFlags.None, <span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> AsyncCallback(ReceiveMessage), client);            <span class="rem" style="color: rgb(0, 128, 0); ">//准备接受下一个客户端请求</span>            socket.BeginAccept(<span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> AsyncCallback(ClientAccepted), socket);        }</span></strong>        <span class="kwrd" style="color: rgb(0, 0, 255); ">static</span> <span class="kwrd" style="color: rgb(0, 0, 255); ">byte</span>[] buffer = <span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> <span class="kwrd" style="color: rgb(0, 0, 255); ">byte</span>[1024];        <span class="kwrd" style="color: rgb(0, 0, 255); ">public</span> <span class="kwrd" style="color: rgb(0, 0, 255); ">static</span> <span class="kwrd" style="color: rgb(0, 0, 255); ">void</span> ReceiveMessage(IAsyncResult ar)        {            <span class="kwrd" style="color: rgb(0, 0, 255); ">try</span>            {                var socket = ar.AsyncState <span class="kwrd" style="color: rgb(0, 0, 255); ">as</span> Socket;                <span class="rem" style="color: rgb(0, 128, 0); ">//方法参考：http://msdn.microsoft.com/zh-cn/library/system.net.sockets.socket.endreceive.aspx</span>                var length = socket.EndReceive(ar);                <span class="rem" style="color: rgb(0, 128, 0); ">//读取出来消息内容</span>                var message = Encoding.Unicode.GetString(buffer, 0, length);                <span class="rem" style="color: rgb(0, 128, 0); ">//显示消息</span>                Console.WriteLine(message);                <span class="rem" style="color: rgb(0, 128, 0); ">//接收下一个消息(因为这是一个递归的调用，所以这样就可以一直接收消息了）</span>                socket.BeginReceive(buffer, 0, buffer.Length, SocketFlags.None, <span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> AsyncCallback(ReceiveMessage), socket);            }            <span class="kwrd" style="color: rgb(0, 0, 255); ">catch</span>(Exception ex){                Console.WriteLine(ex.Message);            }        }    }}

最后调试起来看到的效果如下图

image

 

本文源代码，可以通过这里下载 http://files.cnblogs.com/chenxizhang/SocketWorkshop.rar

本文将在这个案例的基础上，加入一个特殊场景，利用Silverlight来实现客户端。有的朋友可能会说，其实是一样的吧。请不要急于下结论，有用过Silverlight的朋友都有这种体会，很多在标准.NET Framework编程中能用的技术，到了Silverlight里面，或多或少会有些限制。不幸的是，Socket这个功能就是其中一个。这本身没有什么好不好的问题，Silverlight首先是运行在一个特殊的沙盒中，受到一些限制也是意料之中的，毕竟安全第一嘛

 

我总结Silverlight中应用Socket的几点特殊之处

1.所有的操作都必须的异步的，包括连接，发送和接收消息

2.Silverlight只能做客户端，不能做服务器（虽然这句看起来说的有点多余，不过确实有朋友想这么做呢）

3.Silverlight的Socket只能访问如下端口，4502-4530，只能用TCP。

4.Silverlight的Socket收到访问策略的限制，服务端必须监听，并提供ClientAccessPolicy的支持。通常是在943端口（TCP)进行监听，也可以在HTTP 80端口监听。

本文完整代码如下 http://files.cnblogs.com/chenxizhang/SocketWorkshop(with-silverlight).rar

 

 

那么，我们就来通过例子学习一下在Silverlight中如何使用Socket技术与服务端通讯吧

第一步：创建Silverlight项目

image

image

第二步：设计Silverlight界面

<span class="kwrd" style="color: rgb(0, 0, 255); "><</span><span class="html" style="color: rgb(128, 0, 0); ">UserControl</span>    <span class="attr" style="color: rgb(255, 0, 0); ">x:Class</span><span class="kwrd" style="color: rgb(0, 0, 255); ">="SocketSilverlightClient.MainPage"</span>    <span class="attr" style="color: rgb(255, 0, 0); ">xmlns</span><span class="kwrd" style="color: rgb(0, 0, 255); ">="http://schemas.microsoft.com/winfx/2006/xaml/presentation"</span>    <span class="attr" style="color: rgb(255, 0, 0); ">xmlns:x</span><span class="kwrd" style="color: rgb(0, 0, 255); ">="http://schemas.microsoft.com/winfx/2006/xaml"</span>    <span class="attr" style="color: rgb(255, 0, 0); ">xmlns:d</span><span class="kwrd" style="color: rgb(0, 0, 255); ">="http://schemas.microsoft.com/expression/blend/2008"</span>    <span class="attr" style="color: rgb(255, 0, 0); ">xmlns:mc</span><span class="kwrd" style="color: rgb(0, 0, 255); ">="http://schemas.openxmlformats.org/markup-compatibility/2006"</span>    <span class="attr" style="color: rgb(255, 0, 0); ">mc:Ignorable</span><span class="kwrd" style="color: rgb(0, 0, 255); ">="d"</span>    <span class="attr" style="color: rgb(255, 0, 0); ">d:DesignHeight</span><span class="kwrd" style="color: rgb(0, 0, 255); ">="300"</span>    <span class="attr" style="color: rgb(255, 0, 0); ">d:DesignWidth</span><span class="kwrd" style="color: rgb(0, 0, 255); ">="400"</span><span class="kwrd" style="color: rgb(0, 0, 255); ">></span>    <span class="kwrd" style="color: rgb(0, 0, 255); "><</span><span class="html" style="color: rgb(128, 0, 0); ">Grid</span>        <span class="attr" style="color: rgb(255, 0, 0); ">x:Name</span><span class="kwrd" style="color: rgb(0, 0, 255); ">="LayoutRoot"</span>        <span class="attr" style="color: rgb(255, 0, 0); ">Background</span><span class="kwrd" style="color: rgb(0, 0, 255); ">="White"</span>        <span class="attr" style="color: rgb(255, 0, 0); ">Margin</span><span class="kwrd" style="color: rgb(0, 0, 255); ">="20"</span><span class="kwrd" style="color: rgb(0, 0, 255); ">></span>        <span class="kwrd" style="color: rgb(0, 0, 255); "><</span><span class="html" style="color: rgb(128, 0, 0); ">Grid.Resources</span><span class="kwrd" style="color: rgb(0, 0, 255); ">></span>            <span class="kwrd" style="color: rgb(0, 0, 255); "><</span><span class="html" style="color: rgb(128, 0, 0); ">Style</span>                <span class="attr" style="color: rgb(255, 0, 0); ">TargetType</span><span class="kwrd" style="color: rgb(0, 0, 255); ">="Button"</span><span class="kwrd" style="color: rgb(0, 0, 255); ">></span>                <span class="kwrd" style="color: rgb(0, 0, 255); "><</span><span class="html" style="color: rgb(128, 0, 0); ">Setter</span>                    <span class="attr" style="color: rgb(255, 0, 0); ">Property</span><span class="kwrd" style="color: rgb(0, 0, 255); ">="Width"</span>                    <span class="attr" style="color: rgb(255, 0, 0); ">Value</span><span class="kwrd" style="color: rgb(0, 0, 255); ">="100"</span><span class="kwrd" style="color: rgb(0, 0, 255); ">></</span><span class="html" style="color: rgb(128, 0, 0); ">Setter</span><span class="kwrd" style="color: rgb(0, 0, 255); ">></span>                <span class="kwrd" style="color: rgb(0, 0, 255); "><</span><span class="html" style="color: rgb(128, 0, 0); ">Setter</span>                    <span class="attr" style="color: rgb(255, 0, 0); ">Property</span><span class="kwrd" style="color: rgb(0, 0, 255); ">="HorizontalAlignment"</span>                    <span class="attr" style="color: rgb(255, 0, 0); ">Value</span><span class="kwrd" style="color: rgb(0, 0, 255); ">="Left"</span><span class="kwrd" style="color: rgb(0, 0, 255); ">></</span><span class="html" style="color: rgb(128, 0, 0); ">Setter</span><span class="kwrd" style="color: rgb(0, 0, 255); ">></span>                <span class="kwrd" style="color: rgb(0, 0, 255); "><</span><span class="html" style="color: rgb(128, 0, 0); ">Setter</span>                    <span class="attr" style="color: rgb(255, 0, 0); ">Property</span><span class="kwrd" style="color: rgb(0, 0, 255); ">="Margin"</span>                    <span class="attr" style="color: rgb(255, 0, 0); ">Value</span><span class="kwrd" style="color: rgb(0, 0, 255); ">="5"</span><span class="kwrd" style="color: rgb(0, 0, 255); ">></</span><span class="html" style="color: rgb(128, 0, 0); ">Setter</span><span class="kwrd" style="color: rgb(0, 0, 255); ">></span>            <span class="kwrd" style="color: rgb(0, 0, 255); "></</span><span class="html" style="color: rgb(128, 0, 0); ">Style</span><span class="kwrd" style="color: rgb(0, 0, 255); ">></span>            <span class="kwrd" style="color: rgb(0, 0, 255); "><</span><span class="html" style="color: rgb(128, 0, 0); ">Style</span>                <span class="attr" style="color: rgb(255, 0, 0); ">TargetType</span><span class="kwrd" style="color: rgb(0, 0, 255); ">="TextBlock"</span><span class="kwrd" style="color: rgb(0, 0, 255); ">></span>                <span class="kwrd" style="color: rgb(0, 0, 255); "><</span><span class="html" style="color: rgb(128, 0, 0); ">Setter</span>                    <span class="attr" style="color: rgb(255, 0, 0); ">Property</span><span class="kwrd" style="color: rgb(0, 0, 255); ">="Margin"</span>                    <span class="attr" style="color: rgb(255, 0, 0); ">Value</span><span class="kwrd" style="color: rgb(0, 0, 255); ">="5"</span><span class="kwrd" style="color: rgb(0, 0, 255); ">></</span><span class="html" style="color: rgb(128, 0, 0); ">Setter</span><span class="kwrd" style="color: rgb(0, 0, 255); ">></span>                <span class="kwrd" style="color: rgb(0, 0, 255); "><</span><span class="html" style="color: rgb(128, 0, 0); ">Setter</span>                    <span class="attr" style="color: rgb(255, 0, 0); ">Property</span><span class="kwrd" style="color: rgb(0, 0, 255); ">="HorizontalAlignment"</span>                    <span class="attr" style="color: rgb(255, 0, 0); ">Value</span><span class="kwrd" style="color: rgb(0, 0, 255); ">="Left"</span><span class="kwrd" style="color: rgb(0, 0, 255); ">></</span><span class="html" style="color: rgb(128, 0, 0); ">Setter</span><span class="kwrd" style="color: rgb(0, 0, 255); ">></span>                <span class="kwrd" style="color: rgb(0, 0, 255); "><</span><span class="html" style="color: rgb(128, 0, 0); ">Setter</span>                    <span class="attr" style="color: rgb(255, 0, 0); ">Property</span><span class="kwrd" style="color: rgb(0, 0, 255); ">="TextWrapping"</span>                    <span class="attr" style="color: rgb(255, 0, 0); ">Value</span><span class="kwrd" style="color: rgb(0, 0, 255); ">="Wrap"</span><span class="kwrd" style="color: rgb(0, 0, 255); ">></</span><span class="html" style="color: rgb(128, 0, 0); ">Setter</span><span class="kwrd" style="color: rgb(0, 0, 255); ">></span>            <span class="kwrd" style="color: rgb(0, 0, 255); "></</span><span class="html" style="color: rgb(128, 0, 0); ">Style</span><span class="kwrd" style="color: rgb(0, 0, 255); ">></span>        <span class="kwrd" style="color: rgb(0, 0, 255); "></</span><span class="html" style="color: rgb(128, 0, 0); ">Grid.Resources</span><span class="kwrd" style="color: rgb(0, 0, 255); ">></span>        <span class="kwrd" style="color: rgb(0, 0, 255); "><</span><span class="html" style="color: rgb(128, 0, 0); ">StackPanel</span><span class="kwrd" style="color: rgb(0, 0, 255); ">></span>            <span class="kwrd" style="color: rgb(0, 0, 255); "><</span><span class="html" style="color: rgb(128, 0, 0); ">Button</span>                <span class="attr" style="color: rgb(255, 0, 0); ">Content</span><span class="kwrd" style="color: rgb(0, 0, 255); ">="Connect"</span>                <span class="attr" style="color: rgb(255, 0, 0); ">x:Name</span><span class="kwrd" style="color: rgb(0, 0, 255); ">="btConnect"</span>                <span class="attr" style="color: rgb(255, 0, 0); ">Click</span><span class="kwrd" style="color: rgb(0, 0, 255); ">="btConnect_Click"</span><span class="kwrd" style="color: rgb(0, 0, 255); ">></</span><span class="html" style="color: rgb(128, 0, 0); ">Button</span><span class="kwrd" style="color: rgb(0, 0, 255); ">></span>            <span class="kwrd" style="color: rgb(0, 0, 255); "><</span><span class="html" style="color: rgb(128, 0, 0); ">TextBlock</span>                <span class="attr" style="color: rgb(255, 0, 0); ">Text</span><span class="kwrd" style="color: rgb(0, 0, 255); ">="Type your message"</span><span class="kwrd" style="color: rgb(0, 0, 255); ">></</span><span class="html" style="color: rgb(128, 0, 0); ">TextBlock</span><span class="kwrd" style="color: rgb(0, 0, 255); ">></span>            <span class="kwrd" style="color: rgb(0, 0, 255); "><</span><span class="html" style="color: rgb(128, 0, 0); ">StackPanel</span>                <span class="attr" style="color: rgb(255, 0, 0); ">Margin</span><span class="kwrd" style="color: rgb(0, 0, 255); ">="5"</span>                <span class="attr" style="color: rgb(255, 0, 0); ">Orientation</span><span class="kwrd" style="color: rgb(0, 0, 255); ">="Horizontal"</span><span class="kwrd" style="color: rgb(0, 0, 255); ">></span>                <span class="kwrd" style="color: rgb(0, 0, 255); "><</span><span class="html" style="color: rgb(128, 0, 0); ">TextBox</span>                    <span class="attr" style="color: rgb(255, 0, 0); ">x:Name</span><span class="kwrd" style="color: rgb(0, 0, 255); ">="txtInput"</span>                    <span class="attr" style="color: rgb(255, 0, 0); ">Width</span><span class="kwrd" style="color: rgb(0, 0, 255); ">="200"</span><span class="kwrd" style="color: rgb(0, 0, 255); ">></</span><span class="html" style="color: rgb(128, 0, 0); ">TextBox</span><span class="kwrd" style="color: rgb(0, 0, 255); ">></span>                <span class="kwrd" style="color: rgb(0, 0, 255); "><</span><span class="html" style="color: rgb(128, 0, 0); ">Button</span>                    <span class="attr" style="color: rgb(255, 0, 0); ">Content</span><span class="kwrd" style="color: rgb(0, 0, 255); ">="Send"</span>                    <span class="attr" style="color: rgb(255, 0, 0); ">x:Name</span><span class="kwrd" style="color: rgb(0, 0, 255); ">="btSend"</span>                    <span class="attr" style="color: rgb(255, 0, 0); ">Click</span><span class="kwrd" style="color: rgb(0, 0, 255); ">="btSend_Click"</span><span class="kwrd" style="color: rgb(0, 0, 255); ">></</span><span class="html" style="color: rgb(128, 0, 0); ">Button</span><span class="kwrd" style="color: rgb(0, 0, 255); ">></span>            <span class="kwrd" style="color: rgb(0, 0, 255); "></</span><span class="html" style="color: rgb(128, 0, 0); ">StackPanel</span><span class="kwrd" style="color: rgb(0, 0, 255); ">></span>            <span class="kwrd" style="color: rgb(0, 0, 255); "><</span><span class="html" style="color: rgb(128, 0, 0); ">TextBlock</span>                <span class="attr" style="color: rgb(255, 0, 0); ">Text</span><span class="kwrd" style="color: rgb(0, 0, 255); ">="Messages from server"</span><span class="kwrd" style="color: rgb(0, 0, 255); ">></</span><span class="html" style="color: rgb(128, 0, 0); ">TextBlock</span><span class="kwrd" style="color: rgb(0, 0, 255); ">></span>            <span class="kwrd" style="color: rgb(0, 0, 255); "><</span><span class="html" style="color: rgb(128, 0, 0); ">ItemsControl</span>                <span class="attr" style="color: rgb(255, 0, 0); ">Margin</span><span class="kwrd" style="color: rgb(0, 0, 255); ">="5"</span>                <span class="attr" style="color: rgb(255, 0, 0); ">x:Name</span><span class="kwrd" style="color: rgb(0, 0, 255); ">="icResult"</span><span class="kwrd" style="color: rgb(0, 0, 255); ">></span>            <span class="kwrd" style="color: rgb(0, 0, 255); "></</span><span class="html" style="color: rgb(128, 0, 0); ">ItemsControl</span><span class="kwrd" style="color: rgb(0, 0, 255); ">></span>        <span class="kwrd" style="color: rgb(0, 0, 255); "></</span><span class="html" style="color: rgb(128, 0, 0); ">StackPanel</span><span class="kwrd" style="color: rgb(0, 0, 255); ">></span>    <span class="kwrd" style="color: rgb(0, 0, 255); "></</span><span class="html" style="color: rgb(128, 0, 0); ">Grid</span><span class="kwrd" style="color: rgb(0, 0, 255); ">></span><span class="kwrd" style="color: rgb(0, 0, 255); "></</span><span class="html" style="color: rgb(128, 0, 0); ">UserControl</span><span class="kwrd" style="color: rgb(0, 0, 255); ">></span>

这个界面看起来像下面这样

image

 

第三步：编写基本的客户端代码

<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Collections.Generic;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Linq;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Net;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Windows;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Windows.Controls;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Windows.Documents;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Windows.Input;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Windows.Media;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Windows.Media.Animation;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Windows.Shapes;<span class="rem" style="color: rgb(0, 128, 0); ">//导入命名空间</span><span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Net.Sockets;<span class="kwrd" style="color: rgb(0, 0, 255); ">namespace</span> SocketSilverlightClient{    <span class="rem" style="color: rgb(0, 128, 0); ">/// <summary></span>    <span class="rem" style="color: rgb(0, 128, 0); ">/// 演示如何在Silverlight中使用Socket技术</span>    <span class="rem" style="color: rgb(0, 128, 0); ">/// 作者：陈希章</span>    <span class="rem" style="color: rgb(0, 128, 0); ">/// </summary></span>    <span class="kwrd" style="color: rgb(0, 0, 255); ">public</span> <span class="kwrd" style="color: rgb(0, 0, 255); ">partial</span> <span class="kwrd" style="color: rgb(0, 0, 255); ">class</span> MainPage : UserControl    {        <span class="kwrd" style="color: rgb(0, 0, 255); ">public</span> MainPage()        {            InitializeComponent();        }        <span class="rem" style="color: rgb(0, 128, 0); ">/// <summary></span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// 尝试连接到服务器</span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// </summary></span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// <param name="sender"></param></span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// <param name="e"></param></span>        <span class="kwrd" style="color: rgb(0, 0, 255); ">private</span> <span class="kwrd" style="color: rgb(0, 0, 255); ">void</span> btConnect_Click(<span class="kwrd" style="color: rgb(0, 0, 255); ">object</span> sender, RoutedEventArgs e)        {            <span class="rem" style="color: rgb(0, 128, 0); ">//创建一个套接字</span>            var socket = <span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);            <span class="rem" style="color: rgb(0, 128, 0); ">//准备一个异步参数（这是特有的）</span>            var args = <span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> SocketAsyncEventArgs();            <span class="rem" style="color: rgb(0, 128, 0); ">//设置远程服务器地址，这里用DnsSafeHost，可以获取到宿主远程服务器的主机名称</span>            args.RemoteEndPoint = <span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> DnsEndPoint(App.Current.Host.Source.DnsSafeHost, 4530);            <span class="rem" style="color: rgb(0, 128, 0); ">//注册Completed事件处理程序</span>            args.Completed += (o, a) =>            {                <span class="kwrd" style="color: rgb(0, 0, 255); ">if</span>(a.SocketError > 0)<span class="rem" style="color: rgb(0, 128, 0); ">//0表示成功，其他的表示有错误</span>                {                    <span class="rem" style="color: rgb(0, 128, 0); ">//注意，因为Completed方法是在工作线程触发的，所以要对主线程进行访问，必须使用Dispatcher机制</span>                    <span class="kwrd" style="color: rgb(0, 0, 255); ">this</span>.Dispatcher.BeginInvoke(() =>                    {                        MessageBox.Show(<span class="str" style="color: rgb(0, 96, 128); ">"Connect fail:"</span> + a.SocketError.ToString());                    });                }                <span class="kwrd" style="color: rgb(0, 0, 255); ">else</span>                {                    <span class="kwrd" style="color: rgb(0, 0, 255); ">this</span>.Dispatcher.BeginInvoke(() =>                    {                        MessageBox.Show(<span class="str" style="color: rgb(0, 96, 128); ">"Connect success"</span>);                    });                }            };            <span class="rem" style="color: rgb(0, 128, 0); ">//发起异步的连接请求</span>            socket.ConnectAsync(args);        }        <span class="kwrd" style="color: rgb(0, 0, 255); ">private</span> <span class="kwrd" style="color: rgb(0, 0, 255); ">void</span> btSend_Click(<span class="kwrd" style="color: rgb(0, 0, 255); ">object</span> sender, RoutedEventArgs e)        {        }    }}

【注意】在Silverlight中使用Socket的代码，与一般的客户端还是不同的。最主要的区别在于异步模型。

目前，我这里只编写了Connect的代码，是因为这里就会遇到连接问题，其他代码先不着急写出来。我们可以运行起来看看

image

点击“Connect”之后，我们发现有一个错误，是AccessDenied。这就是说，Silverlight遇到了权限问题无法直接访问到服务器。

我们都知道,Silverlight是运行在一个沙盒里面的，它要访问宿主网站之外的资源，是受到很多限制的。它会先尝试检查目标资源是否有一个ClientAccessPolicy的设置。

这里有一篇详细的介绍 http://msdn.microsoft.com/zh-cn/library/cc197955(VS.95).aspx

 

第四步：为服务器添加PolicyServer。

已经有不少先进同学在这方面有研究了。这个PolicyServer是负责向Silverlight发送策略信息的，也就是说，Silverlight的Socket，在连接之前，会默认去连接目标主机的943端口，请求ClientAccessPolicy的认证，只有通过了，则可以继续访问其他的Socket。

 

这个PolicyServer的设计，不是我的原创，但我稍做了修改。请将下面的代码保存为一个独立的文件，放在SocketServer这个项目里面

<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Configuration;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Diagnostics;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.IO;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Net;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Net.Sockets;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Reflection;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Text;<span class="kwrd" style="color: rgb(0, 0, 255); ">namespace</span> SocketServerService{    <span class="rem" style="color: rgb(0, 128, 0); ">/// <summary></span>    <span class="rem" style="color: rgb(0, 128, 0); ">/// This is a silverlight socket client access policy file server.</span>    <span class="rem" style="color: rgb(0, 128, 0); ">/// </span>    <span class="rem" style="color: rgb(0, 128, 0); ">/// Background:</span>    <span class="rem" style="color: rgb(0, 128, 0); ">/// When a socket connection open attempt to some server is made in Silverlight 2.0</span>    <span class="rem" style="color: rgb(0, 128, 0); ">/// Silverlight automatically makes a request to the server in question on port 943 for a policy file</span>    <span class="rem" style="color: rgb(0, 128, 0); ">/// The policy file served includes the valid ports and valid clients for the socket server</span>    <span class="rem" style="color: rgb(0, 128, 0); ">/// </span>    <span class="rem" style="color: rgb(0, 128, 0); ">/// Outcomes:</span>    <span class="rem" style="color: rgb(0, 128, 0); ">/// The socket request will result in success if the client access policy file served by the socket</span>    <span class="rem" style="color: rgb(0, 128, 0); ">/// server permits access to the requested port and the client URI is in the <allow-from> element</span>    <span class="rem" style="color: rgb(0, 128, 0); ">/// See ClientAccessPolicy.xml & http://msdn.microsoft.com/en-us/library/cc645032(VS.95).aspx for further details</span>    <span class="rem" style="color: rgb(0, 128, 0); ">/// </span>    <span class="rem" style="color: rgb(0, 128, 0); ">/// The socket request will be denied if the client access policy file is not served or if the client /</span>    <span class="rem" style="color: rgb(0, 128, 0); ">/// port is denied in the client access policy file</span>    <span class="rem" style="color: rgb(0, 128, 0); ">/// </summary></span>    <span class="kwrd" style="color: rgb(0, 0, 255); ">class</span> SL_SocketPortPolicyListener    {        TcpListener _Listener = <span class="kwrd" style="color: rgb(0, 0, 255); ">null</span>;        TcpClient _Client = <span class="kwrd" style="color: rgb(0, 0, 255); ">null</span>;        <span class="kwrd" style="color: rgb(0, 0, 255); ">const</span> <span class="kwrd" style="color: rgb(0, 0, 255); ">string</span> _PolicyRequestString = <span class="str" style="color: rgb(0, 96, 128); ">"<policy-file-request/>"</span>;        <span class="kwrd" style="color: rgb(0, 0, 255); ">int</span> _ReceivedLength = 0;        <span class="kwrd" style="color: rgb(0, 0, 255); ">byte</span>[] _Policy = <span class="kwrd" style="color: rgb(0, 0, 255); ">null</span>;        <span class="kwrd" style="color: rgb(0, 0, 255); ">byte</span>[] _ReceiveBuffer = <span class="kwrd" style="color: rgb(0, 0, 255); ">null</span>;        EventLog eventLog;        <span class="rem" style="color: rgb(0, 128, 0); ">/// <summary></span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// Initializes a new instance of the <see cref="SL_SocketPortPolicyListener"/> class.</span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// </summary></span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// <param name="serviceEventLog">The service event log.</param></span>        <span class="kwrd" style="color: rgb(0, 0, 255); ">public</span> SL_SocketPortPolicyListener(EventLog serviceEventLog)        {            eventLog = serviceEventLog;            Start();        }<span style="color: rgb(255, 0, 0); ">        <span class="rem" style="color: rgb(0, 128, 0); ">/// <summary></span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// 增加的代码</span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// </summary></span>        <span class="kwrd" style="color: rgb(0, 0, 255); ">public</span> SL_SocketPortPolicyListener()            : <span class="kwrd" style="color: rgb(0, 0, 255); ">this</span>(<span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> EventLog(<span class="str" style="color: rgb(0, 96, 128); ">"Application"</span>))        {        }</span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// <summary></span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// Starts this instance.</span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// </summary></span>        <span class="kwrd" style="color: rgb(0, 0, 255); ">void</span> Start()        {            <span class="kwrd" style="color: rgb(0, 0, 255); ">try</span>            {                <span class="rem" style="color: rgb(0, 128, 0); ">//增加的代码</span><strong><span style="color: rgb(255, 0, 0); ">                var policyConfig =                    <span class="str" style="color: rgb(0, 96, 128); ">"<?xml version=\"1.0\" encoding =\"utf-8\"?>"</span> +                        <span class="str" style="color: rgb(0, 96, 128); ">"<access-policy>"</span> +                          <span class="str" style="color: rgb(0, 96, 128); ">"<cross-domain-access>"</span> +                            <span class="str" style="color: rgb(0, 96, 128); ">"<policy>"</span> +                              <span class="str" style="color: rgb(0, 96, 128); ">"<allow-from>"</span> +                                <span class="str" style="color: rgb(0, 96, 128); ">"<domain uri=\"*\" />"</span> +                              <span class="str" style="color: rgb(0, 96, 128); ">"</allow-from>"</span> +                              <span class="str" style="color: rgb(0, 96, 128); ">"<grant-to>"</span> +                                <span class="str" style="color: rgb(0, 96, 128); ">"<socket-resource port=\"4502-4530\" protocol=\"tcp\" />"</span> +                              <span class="str" style="color: rgb(0, 96, 128); ">"</grant-to>"</span> +                            <span class="str" style="color: rgb(0, 96, 128); ">"</policy>"</span> +                          <span class="str" style="color: rgb(0, 96, 128); ">"</cross-domain-access>"</span> +                        <span class="str" style="color: rgb(0, 96, 128); ">"</access-policy>"</span>;</span></strong>                <span class="rem" style="color: rgb(0, 128, 0); ">//删除的代码</span>                <span class="rem" style="color: rgb(0, 128, 0); ">//string executionLocation = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);</span>                <span class="rem" style="color: rgb(0, 128, 0); ">//string policyFile = ConfigurationManager.AppSettings["PolicyFilePath"];</span>                <span class="rem" style="color: rgb(0, 128, 0); ">//using(FileStream fs = new FileStream(executionLocation + policyFile, FileMode.Open))</span>                <span class="rem" style="color: rgb(0, 128, 0); ">//{</span>                <span class="rem" style="color: rgb(0, 128, 0); ">//    _Policy = new byte[fs.Length];</span>                <span class="rem" style="color: rgb(0, 128, 0); ">//    fs.Read(_Policy, 0, _Policy.Length);</span>                <span class="rem" style="color: rgb(0, 128, 0); ">//}</span>                <span class="rem" style="color: rgb(0, 128, 0); ">//增加的代码</span>                <span style="color: rgb(255, 0, 0); "><strong>_Policy = Encoding.Default.GetBytes(policyConfig);</strong></span>                _ReceiveBuffer = <span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> <span class="kwrd" style="color: rgb(0, 0, 255); ">byte</span>[_PolicyRequestString.Length];                <span class="rem" style="color: rgb(0, 128, 0); ">//Using TcpListener which is a wrapper around a Socket</span>                <span class="rem" style="color: rgb(0, 128, 0); ">//Allowed port is 943 for Silverlight sockets policy data</span>                _Listener = <span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> TcpListener(IPAddress.Any, 943);                _Listener.Start();                _Listener.BeginAcceptTcpClient(<span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> AsyncCallback(OnBeginAccept), <span class="kwrd" style="color: rgb(0, 0, 255); ">null</span>);            }            <span class="kwrd" style="color: rgb(0, 0, 255); ">catch</span>(Exception exp)            {                LogError(exp);            }        }        <span class="rem" style="color: rgb(0, 128, 0); ">/// <summary></span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// Called when [begin accept].</span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// </summary></span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// <param name="ar">The ar.</param></span>        <span class="kwrd" style="color: rgb(0, 0, 255); ">private</span> <span class="kwrd" style="color: rgb(0, 0, 255); ">void</span> OnBeginAccept(IAsyncResult ar)        {            _Client = _Listener.EndAcceptTcpClient(ar);            _Client.Client.BeginReceive(_ReceiveBuffer, 0, _PolicyRequestString.Length, SocketFlags.None,                <span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> AsyncCallback(OnReceiveComplete), <span class="kwrd" style="color: rgb(0, 0, 255); ">null</span>);        }        <span class="rem" style="color: rgb(0, 128, 0); ">/// <summary></span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// Called when [receive complete].</span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// </summary></span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// <param name="ar">The ar.</param></span>        <span class="kwrd" style="color: rgb(0, 0, 255); ">private</span> <span class="kwrd" style="color: rgb(0, 0, 255); ">void</span> OnReceiveComplete(IAsyncResult ar)        {            <span class="kwrd" style="color: rgb(0, 0, 255); ">try</span>            {                _ReceivedLength += _Client.Client.EndReceive(ar);                <span class="rem" style="color: rgb(0, 128, 0); ">//See if there's more data that we need to grab</span>                <span class="kwrd" style="color: rgb(0, 0, 255); ">if</span>(_ReceivedLength < _PolicyRequestString.Length)                {                    <span class="rem" style="color: rgb(0, 128, 0); ">//Need to grab more data so receive remaining data</span>                    _Client.Client.BeginReceive(_ReceiveBuffer, _ReceivedLength,                        _PolicyRequestString.Length - _ReceivedLength,                        SocketFlags.None, <span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> AsyncCallback(OnReceiveComplete), <span class="kwrd" style="color: rgb(0, 0, 255); ">null</span>);                    <span class="kwrd" style="color: rgb(0, 0, 255); ">return</span>;                }                <span class="rem" style="color: rgb(0, 128, 0); ">//Check that <policy-file-request/> was sent from client</span>                <span class="kwrd" style="color: rgb(0, 0, 255); ">string</span> request = System.Text.Encoding.UTF8.GetString(_ReceiveBuffer, 0, _ReceivedLength);                <span class="kwrd" style="color: rgb(0, 0, 255); ">if</span>(StringComparer.InvariantCultureIgnoreCase.Compare(request, _PolicyRequestString) != 0)                {                    <span class="rem" style="color: rgb(0, 128, 0); ">//Data received isn't valid so close</span>                    _Client.Client.Close();                    <span class="kwrd" style="color: rgb(0, 0, 255); ">return</span>;                }                <span class="rem" style="color: rgb(0, 128, 0); ">//Valid request received....send policy file</span>                _Client.Client.BeginSend(_Policy, 0, _Policy.Length, SocketFlags.None,                    <span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> AsyncCallback(OnSendComplete), _Client.Client);            }            <span class="kwrd" style="color: rgb(0, 0, 255); ">catch</span>(Exception exp)            {                _Client.Client.Close();                LogError(exp);            }            _ReceivedLength = 0;            <span class="rem" style="color: rgb(0, 128, 0); ">//listen for the next client</span>            _Listener.BeginAcceptTcpClient(<span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> AsyncCallback(OnBeginAccept), <span class="kwrd" style="color: rgb(0, 0, 255); ">null</span>);        }        <span class="rem" style="color: rgb(0, 128, 0); ">/// <summary></span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// Called when [send complete].</span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// </summary></span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// <param name="ar">The ar.</param></span>        <span class="kwrd" style="color: rgb(0, 0, 255); ">private</span> <span class="kwrd" style="color: rgb(0, 0, 255); ">void</span> OnSendComplete(IAsyncResult ar)        {            Socket socket = (Socket)ar.AsyncState;            <span class="kwrd" style="color: rgb(0, 0, 255); ">try</span>            {                socket.EndSend(ar);            }            <span class="kwrd" style="color: rgb(0, 0, 255); ">catch</span>(Exception exp)            {                LogError(exp);            }            <span class="kwrd" style="color: rgb(0, 0, 255); ">finally</span>            {                socket.Close();            }        }        <span class="rem" style="color: rgb(0, 128, 0); ">/// <summary></span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// Logs the error.</span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// </summary></span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// <param name="exp">The exp.</param></span>        <span class="kwrd" style="color: rgb(0, 0, 255); ">private</span> <span class="kwrd" style="color: rgb(0, 0, 255); ">void</span> LogError(Exception exp)        {            eventLog.WriteEntry(<span class="kwrd" style="color: rgb(0, 0, 255); ">string</span>.Format(<span class="str" style="color: rgb(0, 96, 128); ">"Error in PolicySocketServer: {0} \r\n StackTrace: {1}"</span>, exp.Message, exp.StackTrace));        }    }}

 

然后，在SocketServer的主程序中，加入下面的代码（只需要添加红色这一行即可）

 

<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Collections.Generic;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Linq;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Text;<span class="rem" style="color: rgb(0, 128, 0); ">//额外导入的两个命名空间</span><span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Net.Sockets;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Net;<span class="kwrd" style="color: rgb(0, 0, 255); ">namespace</span> SocketServer{    <span class="kwrd" style="color: rgb(0, 0, 255); ">class</span> Program    {        <span class="rem" style="color: rgb(0, 128, 0); ">/// <summary></span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// Socket Server 演示</span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// 作者：陈希章</span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// </summary></span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// <param name="args"></param></span>        <span class="kwrd" style="color: rgb(0, 0, 255); ">static</span> <span class="kwrd" style="color: rgb(0, 0, 255); ">void</span> Main(<span class="kwrd" style="color: rgb(0, 0, 255); ">string</span>[] args)        {            <strong><span style="color: rgb(255, 0, 0); ">var policyServer = <span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> SocketServerService.SL_SocketPortPolicyListener();</span></strong>            <span class="rem" style="color: rgb(0, 128, 0); ">//创建一个新的Socket,这里我们使用最常用的基于TCP的Stream Socket（流式套接字）</span>            var socket = <span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);            <span class="rem" style="color: rgb(0, 128, 0); ">//将该socket绑定到主机上面的某个端口</span>            <span class="rem" style="color: rgb(0, 128, 0); ">//方法参考：http://msdn.microsoft.com/zh-cn/library/system.net.sockets.socket.bind.aspx</span>            socket.Bind(<span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> IPEndPoint(IPAddress.Any, 4530));            <span class="rem" style="color: rgb(0, 128, 0); ">//启动监听，并且设置一个最大的队列长度</span>            <span class="rem" style="color: rgb(0, 128, 0); ">//方法参考：http://msdn.microsoft.com/zh-cn/library/system.net.sockets.socket.listen(v=VS.100).aspx</span>            socket.Listen(4);            <span class="rem" style="color: rgb(0, 128, 0); ">//开始接受客户端连接请求</span>            <span class="rem" style="color: rgb(0, 128, 0); ">//方法参考：http://msdn.microsoft.com/zh-cn/library/system.net.sockets.socket.beginaccept.aspx</span>            socket.BeginAccept(<span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> AsyncCallback(ClientAccepted), socket);            Console.WriteLine(<span class="str" style="color: rgb(0, 96, 128); ">"Server is ready!"</span>);            Console.Read();        }        <span class="kwrd" style="color: rgb(0, 0, 255); ">public</span> <span class="kwrd" style="color: rgb(0, 0, 255); ">static</span> <span class="kwrd" style="color: rgb(0, 0, 255); ">void</span> ClientAccepted(IAsyncResult ar)        {            var socket = ar.AsyncState <span class="kwrd" style="color: rgb(0, 0, 255); ">as</span> Socket;            <span class="rem" style="color: rgb(0, 128, 0); ">//这就是客户端的Socket实例，我们后续可以将其保存起来</span>            var client = socket.EndAccept(ar);            <span class="rem" style="color: rgb(0, 128, 0); ">//给客户端发送一个欢迎消息</span>            client.Send(Encoding.Unicode.GetBytes(<span class="str" style="color: rgb(0, 96, 128); ">"Hi there, I accept you request at "</span> + DateTime.Now.ToString()));            <span class="rem" style="color: rgb(0, 128, 0); ">//实现每隔两秒钟给服务器发一个消息</span>            <span class="rem" style="color: rgb(0, 128, 0); ">//这里我们使用了一个定时器</span>            var timer = <span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> System.Timers.Timer();            timer.Interval = 2000D;            timer.Enabled = <span class="kwrd" style="color: rgb(0, 0, 255); ">true</span>;            timer.Elapsed += (o, a) =>            {                <span class="rem" style="color: rgb(0, 128, 0); ">//检测客户端Socket的状态</span>                <span class="kwrd" style="color: rgb(0, 0, 255); ">if</span>(client.Connected)                {                    <span class="kwrd" style="color: rgb(0, 0, 255); ">try</span>                    {                        client.Send(Encoding.Unicode.GetBytes(<span class="str" style="color: rgb(0, 96, 128); ">"Message from server at "</span> + DateTime.Now.ToString()));                    }                    <span class="kwrd" style="color: rgb(0, 0, 255); ">catch</span>(SocketException ex)                    {                        Console.WriteLine(ex.Message);                    }                }                <span class="kwrd" style="color: rgb(0, 0, 255); ">else</span>                {                    timer.Stop();                    timer.Enabled = <span class="kwrd" style="color: rgb(0, 0, 255); ">false</span>;                    Console.WriteLine(<span class="str" style="color: rgb(0, 96, 128); ">"Client is disconnected, the timer is stop."</span>);                }            };            timer.Start();            <span class="rem" style="color: rgb(0, 128, 0); ">//接收客户端的消息(这个和在客户端实现的方式是一样的）</span>            client.BeginReceive(buffer, 0, buffer.Length, SocketFlags.None, <span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> AsyncCallback(ReceiveMessage), client);            <span class="rem" style="color: rgb(0, 128, 0); ">//准备接受下一个客户端请求</span>            socket.BeginAccept(<span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> AsyncCallback(ClientAccepted), socket);        }        <span class="kwrd" style="color: rgb(0, 0, 255); ">static</span> <span class="kwrd" style="color: rgb(0, 0, 255); ">byte</span>[] buffer = <span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> <span class="kwrd" style="color: rgb(0, 0, 255); ">byte</span>[1024];        <span class="kwrd" style="color: rgb(0, 0, 255); ">public</span> <span class="kwrd" style="color: rgb(0, 0, 255); ">static</span> <span class="kwrd" style="color: rgb(0, 0, 255); ">void</span> ReceiveMessage(IAsyncResult ar)        {            <span class="kwrd" style="color: rgb(0, 0, 255); ">try</span>            {                var socket = ar.AsyncState <span class="kwrd" style="color: rgb(0, 0, 255); ">as</span> Socket;                <span class="rem" style="color: rgb(0, 128, 0); ">//方法参考：http://msdn.microsoft.com/zh-cn/library/system.net.sockets.socket.endreceive.aspx</span>                var length = socket.EndReceive(ar);                <span class="rem" style="color: rgb(0, 128, 0); ">//读取出来消息内容</span>                var message = Encoding.Unicode.GetString(buffer, 0, length);                <span class="rem" style="color: rgb(0, 128, 0); ">//显示消息</span>                Console.WriteLine(message);                <span class="rem" style="color: rgb(0, 128, 0); ">//接收下一个消息(因为这是一个递归的调用，所以这样就可以一直接收消息了）</span>                socket.BeginReceive(buffer, 0, buffer.Length, SocketFlags.None, <span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> AsyncCallback(ReceiveMessage), socket);            }            <span class="kwrd" style="color: rgb(0, 0, 255); ">catch</span>(Exception ex){                Console.WriteLine(ex.Message);            }        }    }}

再次测试，我们就发现Silverlight客户端能够连接到服务器了

image

 

既然连接上了服务器，那么就让我们来将Silverlight客户端里面其他的一些功能都实现一下吧

 

第五步：实现Silverlight客户端的消息收发

<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Collections.Generic;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Linq;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Net;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Windows;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Windows.Controls;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Windows.Documents;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Windows.Input;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Windows.Media;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Windows.Media.Animation;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Windows.Shapes;<span class="rem" style="color: rgb(0, 128, 0); ">//导入命名空间</span><span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Net.Sockets;<span class="kwrd" style="color: rgb(0, 0, 255); ">using</span> System.Text;<span class="kwrd" style="color: rgb(0, 0, 255); ">namespace</span> SocketSilverlightClient{    <span class="rem" style="color: rgb(0, 128, 0); ">/// <summary></span>    <span class="rem" style="color: rgb(0, 128, 0); ">/// 演示如何在Silverlight中使用Socket技术</span>    <span class="rem" style="color: rgb(0, 128, 0); ">/// 作者：陈希章</span>    <span class="rem" style="color: rgb(0, 128, 0); ">/// </summary></span>    <span class="kwrd" style="color: rgb(0, 0, 255); ">public</span> <span class="kwrd" style="color: rgb(0, 0, 255); ">partial</span> <span class="kwrd" style="color: rgb(0, 0, 255); ">class</span> MainPage : UserControl    {        <span class="kwrd" style="color: rgb(0, 0, 255); ">public</span> MainPage()        {            InitializeComponent();        }        <span class="rem" style="color: rgb(0, 128, 0); ">//创建一个套接字</span>        Socket socket = <span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);        <span class="rem" style="color: rgb(0, 128, 0); ">/// <summary></span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// 尝试连接到服务器</span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// </summary></span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// <param name="sender"></param></span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// <param name="e"></param></span>        <span class="kwrd" style="color: rgb(0, 0, 255); ">private</span> <span class="kwrd" style="color: rgb(0, 0, 255); ">void</span> btConnect_Click(<span class="kwrd" style="color: rgb(0, 0, 255); ">object</span> sender, RoutedEventArgs e)        {            <span class="rem" style="color: rgb(0, 128, 0); ">//准备一个异步参数（这是特有的）</span>            var args = <span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> SocketAsyncEventArgs();            <span class="rem" style="color: rgb(0, 128, 0); ">//设置远程服务器地址，这里用DnsSafeHost，可以获取到宿主远程服务器的主机名称</span>            args.RemoteEndPoint = <span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> DnsEndPoint(App.Current.Host.Source.DnsSafeHost, 4530);            <span class="rem" style="color: rgb(0, 128, 0); ">//注册Completed事件处理程序</span>            args.Completed += ConnectCompleted;            <span class="rem" style="color: rgb(0, 128, 0); ">//发起异步的连接请求</span>            socket.ConnectAsync(args);        }        <span class="rem" style="color: rgb(0, 128, 0); ">/// <summary></span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// 该事件在连接成功时发生</span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// </summary></span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// <param name="sender"></param></span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// <param name="args"></param></span>        <span class="kwrd" style="color: rgb(0, 0, 255); ">public</span> <span class="kwrd" style="color: rgb(0, 0, 255); ">void</span> ConnectCompleted(<span class="kwrd" style="color: rgb(0, 0, 255); ">object</span> sender, SocketAsyncEventArgs e)        {            <span class="kwrd" style="color: rgb(0, 0, 255); ">if</span>(e.SocketError > 0)<span class="rem" style="color: rgb(0, 128, 0); ">//0表示成功，其他的表示有错误</span>            {                <span class="rem" style="color: rgb(0, 128, 0); ">//注意，因为Completed方法是在工作线程触发的，所以要对主线程进行访问，必须使用Dispatcher机制</span>                <span class="kwrd" style="color: rgb(0, 0, 255); ">this</span>.Dispatcher.BeginInvoke(() =>                {                    MessageBox.Show(<span class="str" style="color: rgb(0, 96, 128); ">"Connect fail:"</span> + e.SocketError.ToString());                });            }            <span class="kwrd" style="color: rgb(0, 0, 255); ">else</span>            {                <span class="kwrd" style="color: rgb(0, 0, 255); ">this</span>.Dispatcher.BeginInvoke(() =>                {                    <span class="rem" style="color: rgb(0, 128, 0); ">//MessageBox.Show("Connect success");</span>                    <span class="rem" style="color: rgb(0, 128, 0); ">//将连接按钮禁用掉</span>                    btConnect.Content = <span class="str" style="color: rgb(0, 96, 128); ">"Connected"</span>;                    btConnect.IsEnabled = <span class="kwrd" style="color: rgb(0, 0, 255); ">false</span>;                    var buffer = <span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> <span class="kwrd" style="color: rgb(0, 0, 255); ">byte</span>[1024];                    e.SetBuffer(buffer, 0, buffer.Length);                    e.Completed -= ConnectCompleted;                    e.Completed += ReceiveCompleted;                    socket.ReceiveAsync(e);                });            }        }        <span class="rem" style="color: rgb(0, 128, 0); ">/// <summary></span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// 该事件在接收消息时发生</span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// </summary></span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// <param name="sender"></param></span>        <span class="rem" style="color: rgb(0, 128, 0); ">/// <param name="args"></param></span>        <span class="kwrd" style="color: rgb(0, 0, 255); ">public</span> <span class="kwrd" style="color: rgb(0, 0, 255); ">void</span> ReceiveCompleted(<span class="kwrd" style="color: rgb(0, 0, 255); ">object</span> sender, SocketAsyncEventArgs e)        {            <span class="rem" style="color: rgb(0, 128, 0); ">//将消息显示在界面上</span>            var result = Encoding.Unicode.GetString(e.Buffer, 0, e.Count);            <span class="kwrd" style="color: rgb(0, 0, 255); ">this</span>.Dispatcher.BeginInvoke(() =>            {                icResult.Items.Add(result);            });            <span class="rem" style="color: rgb(0, 128, 0); ">//递归继续接收消息</span>            socket.ReceiveAsync(e);        }        <span class="kwrd" style="color: rgb(0, 0, 255); ">private</span> <span class="kwrd" style="color: rgb(0, 0, 255); ">void</span> btSend_Click(<span class="kwrd" style="color: rgb(0, 0, 255); ">object</span> sender, RoutedEventArgs e)        {            var args = <span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> SocketAsyncEventArgs();            <span class="rem" style="color: rgb(0, 128, 0); ">//将用户输入的文本转成字节</span>            var buffer = Encoding.Unicode.GetBytes(txtInput.Text);            args.SetBuffer(buffer, 0, buffer.Length);            <span class="rem" style="color: rgb(0, 128, 0); ">//设置远程服务器地址，这里用DnsSafeHost，可以获取到宿主远程服务器的主机名称</span>            args.RemoteEndPoint = <span class="kwrd" style="color: rgb(0, 0, 255); ">new</span> DnsEndPoint(App.Current.Host.Source.DnsSafeHost, 4530);            <span class="rem" style="color: rgb(0, 128, 0); ">//发送完成的话，将控件清空，激活</span>            args.Completed += (o, a) => {                <span class="kwrd" style="color: rgb(0, 0, 255); ">this</span>.Dispatcher.BeginInvoke(() =>                {                    txtInput.Text = <span class="kwrd" style="color: rgb(0, 0, 255); ">string</span>.Empty;                    btSend.IsEnabled = <span class="kwrd" style="color: rgb(0, 0, 255); ">true</span>;                });            };            <span class="rem" style="color: rgb(0, 128, 0); ">//禁用按钮</span>            btSend.IsEnabled = <span class="kwrd" style="color: rgb(0, 0, 255); ">false</span>;            <span class="rem" style="color: rgb(0, 128, 0); ">//发送消息</span>            socket.SendAsync(args);        }    }}

运行起来看看吧

image

image

 

还不错对吧，这个例子给大家演示了如何在Silverlight中使用Socket，接下来大家可以结合自己的现实工作做一些研究和扩展吧

本文完整代码如下 http://files.cnblogs.com/chenxizhang/SocketWorkshop(with-silverlight).rar


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