c#简单的socket通讯demo

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
using System.Net.Sockets;
using System.Runtime.Serialization.Formatters.Binary;
using System.Threading;

namespace ClientSocket
{
    class Program
    {
        private static Socket ServersClientSocket;//服务端得到的客户端的SOCKET
        private static Socket ClientSocket;//客户端Socket
        private static object lockHelper = new object();
        /// <summary>
        /// 开启服务端
        /// </summary>
        private static void StartAccept()
        {
            IPEndPoint ipep = new IPEndPoint(IPAddress.Parse("192.168.3.18"), 1005);
            Socket server = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            //下一句  设置SOCKET允许多个SOCKET访问同一个本地IP地址和端口号 
            //server.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
            server.Bind(ipep);
            server.Listen(60);//非阻塞方法            
            while (true)
            {
                try
                {
                    Console.WriteLine("server:being listen");
                    ServersClientSocket = server.Accept();//阻塞方法
                    Console.WriteLine("server:accept one link");
                    Thread t = new Thread(new ThreadStart(StartReceive));
                    t.Start();
                }
                catch(Exception ex)
                {
                    Console.WriteLine(ex.ToString());
                }
            }
        }
        /// <summary>
        /// 服务端开始接收数据
        /// </summary>
        private static void StartReceive()
        {
            IPEndPoint clientep = (IPEndPoint)ServersClientSocket.RemoteEndPoint;
            while (true)
            {
                var message = RecevieMessage();
                Console.WriteLine("server:the client send message is:\n" + message);
            }
        }
        /// <summary>
        /// 客户端开始连接服务端
        /// </summary>
        private static void StartConnect()
        {
            IPEndPoint ipep = new IPEndPoint(IPAddress.Parse("192.168.3.18"), 1005);
            ClientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            ClientSocket.Connect(ipep);
            while (true)
            {
                Console.WriteLine("client:please put your message in:");
                string msg = Console.ReadLine();
                byte[] data = Encoding.Unicode.GetBytes(msg);
                SendMessage(data);
            }
        }
        /// <summary>
        /// 发送消息
        /// </summary>
        /// <param name="msg"></param>
        private static void SendMessage(byte[] data)
        {
            int total = 0;
            int size = data.Length;
            int dataleft = size;
            int sent;
            byte[] datasize = new byte[4];
            datasize = BitConverter.GetBytes(size);
            ClientSocket.Send(datasize);
            Console.WriteLine("发送的数据长度:" + size.ToString());
            while (total < size)
            {
                sent = ClientSocket.Send(data, total, dataleft, SocketFlags.None);
                total += sent;
                dataleft -= sent;
            }
        }
        /// <summary>
        /// 接收消息
        /// </summary>
        private static string RecevieMessage()
        {
            int total = 0;
            int recv;
            byte[] datasize = new byte[4];
            recv = ServersClientSocket.Receive(datasize, 0, 4, SocketFlags.None);
            int size = BitConverter.ToInt32(datasize, 0);
            int dataleft = size;
            byte[] data = new byte[size];
            while (total < size)
            {
                recv = ServersClientSocket.Receive(data, total, dataleft, SocketFlags.None);
                if (recv == 0)
                {
                    data = null;
                    break;
                }
                total += recv;
                dataleft -= recv;
            }
            if (data == null)
            {
                return "error";
            }
            string result = Encoding.Unicode.GetString(data.Take(36).ToArray());
            return result;
        }
        /// <summary>
        /// 入口函数
        /// </summary>
        /// <param name="args"></param>
        static void Main(string[] args)
        {
            Thread t = new Thread(new ThreadStart(StartAccept));
            t.Start();
            Thread.Sleep(3000);//等待服务线程开始工作
            Thread t2 = new Thread(StartConnect);
            t2.Start();
            while (true)
            {
                ConsoleKeyInfo a = Console.ReadKey();
                if (a.KeyChar == '+')
                {
                    System.Environment.Exit(0);
                }
            }
        }
    }
}

代码中注释比较多
如果仍旧看不懂请看JimmyZhang的这篇文章
http://www.cnblogs.com/JimmyZhang/archive/2008/09/07/1286300.html
讲的很细很基础