简单的C#socket例子（转载）

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using System.Net;
using System.Net.Sockets;

服务端代码：

static void Main(string[] args)
        {
            int port = 2000;
            string host = "127.0.0.1";

            IPAddress ip = IPAddress.Parse(host);
            IPEndPoint ipe = new IPEndPoint(ip, port);

            Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            socket.Bind(ipe);
            socket.Listen(0);  //监听
            Console.WriteLine("waiting.......");

            //接受来自客户端发送的信息
            Socket temp = socket.Accept();  //创建新的socket用于和客户端通信
            Console.WriteLine("ok...");
            string recstr = "";
            byte[] recbyte = new byte[1024];
            int bytes;
            bytes = temp.Receive(recbyte, recbyte.Length, 0);
            recstr += Encoding.ASCII.GetString(recbyte, 0, bytes);

            //给客户端返回信息
            Console.WriteLine("server get message:{0}", recstr);
            string sendstr = "client send message successful";
            byte[] by = Encoding.ASCII.GetBytes(sendstr);
            temp.Send(by, by.Length, 0);  //发送
            temp.Close();                 //关闭
            socket.Close();
            Console.ReadLine();

        }

客户端代码：

static void Main(string[] args)
        {
            try
            {
                int port = 2000;
                string host = "127.0.0.1";

                IPAddress ip = IPAddress.Parse(host);
                IPEndPoint iped = new IPEndPoint(ip, port);

                Socket soc = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
                Console.WriteLine("waiting......");
                soc.Connect(iped);  //连接

                //向服务端发送消息
                string sendstr = "hello,this is client message";
                byte[] bytes = Encoding.ASCII.GetBytes(sendstr);
                Console.WriteLine("send message");
                soc.Send(bytes);

                //接受由服务端返回的信息
                string recstr = "";
                byte[] recbyte = new byte[1024];
                int bytess;
                bytess = soc.Receive(recbyte, recbyte.Length, 0);
                recstr += Encoding.ASCII.GetString(recbyte, 0, bytess);
                Console.WriteLine("get message:{0}", recstr);
                soc.Close();

            }
            catch (Exception ex)
            {
                Console.WriteLine("error");
            }
            Console.WriteLine("press enter exit");
            Console.ReadLine();
        }