【转】C#socket通信

原文地址：https://www.cnblogs.com/sdyinfang/p/5519708.html

关于C#socket通信，分为同步和异步通信，本文简单介绍一下同步通信。

通信两端分别为客户端（Client）和服务器(Server):

(1)Cient:

1：建立一个Socket对像；

2：用socket对像的Connect()方法以上面建立的EndPoint对像做为参数，向服务器发出连接请求；

3：如果连接成功，就用socket对像的Send()方法向服务器发送信息；

4：用socket对像的Receive()方法接受服务器发来的信息 ;

5：通信结束后一定记得关闭socket；

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using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Net.Sockets; using System.Net;   namespace Client {     class Program     {        static Socket ClientSocket;         static void Main(string[] args)         {             String IP = "127.0.0.1";             int port =8885 ;               IPAddress ip = IPAddress.Parse(IP);  //将IP地址字符串转换成IPAddress实例             ClientSocket = new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp);//使用指定的地址簇协议、套接字类型和通信协议             IPEndPoint endPoint = new IPEndPoint(ip, port); // 用指定的ip和端口号初始化IPEndPoint实例             ClientSocket.Connect(endPoint);  //与远程主机建立连接                 Console.WriteLine("开始发送消息");             byte[] message = Encoding.ASCII.GetBytes("Connect the Server");  //通信时实际发送的是字节数组，所以要将发送消息转换字节             ClientSocket.Send(message);             Console.WriteLine("发送消息为:" + Encoding.ASCII.GetString(message));             byte[] receive = new byte[1024];             int length = ClientSocket.Receive(receive);  // length 接收字节数组长度             Console.WriteLine("接收消息为：" + Encoding.ASCII.GetString(receive));             ClientSocket.Close();  //关闭连接         }     } }

客户端返回结果:

(2)Server: 

1：建立一个Socket对像；

2：用socket对像的Bind()方法绑定EndPoint；

3：用socket对像的Listen()方法开始监听；

4：接受到客户端的连接，用socket对像的Accept()方法创建新的socket对像用于和请求的客户端进行通信;

5：用新的socket对象接收（Receive）和发送（Send）消息。

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using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Net.Sockets; using System.Net; using System.Threading;   namespace Server {     class Program     {         static Socket ReceiveSocket;         static void Main(string[] args)         {             int port = 8885;             IPAddress ip = IPAddress.Any;  // 侦听所有网络客户接口的客活动             ReceiveSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);//使用指定的地址簇协议、套接字类型和通信协议   <br>            ReceiveSocket.SetSocketOption(SocketOptionLevel.Socket,SocketOptionName.ReuseAddress,true);  //有关套接字设置             IPEndPoint endPoint = new IPEndPoint(ip,port);             ReceiveSocket.Bind(new IPEndPoint(ip, port)); //绑定IP地址和端口号             ReceiveSocket.Listen(10);  //设定最多有10个排队连接请求             Console.WriteLine("建立连接");             Socket socket = ReceiveSocket.Accept();                        byte[] receive = new byte[1024];             socket.Receive(receive);             Console.WriteLine("接收到消息：" + Encoding.ASCII.GetString(receive));             byte[] send = Encoding.ASCII.GetBytes("Success receive the message,send the back the message");             socket.Send(send);             Console.WriteLine("发送消息为："+Encoding.ASCII.GetString(send));         }      } }

　服务器返回结果：