Udp Client发送局域网广播消息

1. new UdpClient(11000)就是用Udp方式侦听11000端口，侦听任何发送到11000端口的消息都会接收到。
2. <div class="blockcode"><blockquote>UdpClient udpClient = new UdpClient(11000);
3. try {     
4. IPEndPoint RemoteIpEndPoint = new IPEndPoint(IPAddress.Any, 0);  
5. Byte[] receiveBytes = udpClient.Receive(ref RemoteIpEndPoint);  
6. string returnData = Encoding.ASCII.GetString(receiveBytes);   
7.   Console.WriteLine("This is the message you received " +                                  returnData.ToString());   
8. Console.WriteLine("This message was sent from " +                                 RemoteIpEndPoint.Address.ToString() +                        
9.         " on their port number " +                           
10.   RemoteIpEndPoint.Port.ToString());
11.     udpClient.Close();
12. }
13. catch (Exception e) {
14.     Console.WriteLine(e.ToString());
15. }
16. <p>然后写个发Udp的服务器</p><p> </p><div class="cnblogs_code"><span class="cnblogs_code_collapse">代码</span> :<div style="display: block;" id="cnblogs_code_open_7f65fb5c-36d6-4545-bb7a-62f606976cee" class="cnblogs_code_hide" jquery1260496893593="7"><pre><div><!--
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21. --><span style="color: rgb(0, 0, 0);">UdpClient udpClient </span><span style="color: rgb(0, 0, 0);">=</span><span style="color: rgb(0, 0, 0);"> </span><span style="color: rgb(0, 0, 255);">new</span><span style="color: rgb(0, 0, 0);"> UdpClient(</span><span style="color: rgb(128, 0, 128);">11001</span><span style="color: rgb(0, 0, 0);">);
22. </span><span style="color: rgb(0, 0, 255);">try</span><span style="color: rgb(0, 0, 0);">
23. {
24.     udpClient.Connect(IPAddress.Parse(</span><span style="color: rgb(128, 0, 0);">"</span><span style="color: rgb(128, 0, 0);">192.168.0.255</span><span style="color: rgb(128, 0, 0);">"</span><span style="color: rgb(0, 0, 0);">), </span><span style="color: rgb(128, 0, 128);">11000</span><span style="color: rgb(0, 0, 0);">);  
25.     Byte[] sendBytes </span><span style="color: rgb(0, 0, 0);">=</span><span style="color: rgb(0, 0, 0);"> Encoding.ASCII.GetBytes(</span><span style="color: rgb(128, 0, 0);">"</span><span style="color: rgb(128, 0, 0);">Is anybody thereA?</span><span style="color: rgb(128, 0, 0);">"</span><span style="color: rgb(0, 0, 0);">);
27.     udpClient.Send(sendBytes, sendBytes.Length);
29.     udpClient.Close();
31. }
32. </span><span style="color: rgb(0, 0, 255);">catch</span><span style="color: rgb(0, 0, 0);"> (Exception e)
33. {
34.     Console.WriteLine(e.ToString());
35. }
36. </span></div></pre></div></div><p>其中192.168.0.255是你的内网广播地址，11000是客户端的端口。</p><p>广播地址是通过你的子网掩码获得的例如你的网关是192.168.0.1，掩码是255.255.255.0，那么你的广播地址就是192.168.0.255.</p>
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