下面是示例程序的简单步骤说明

 

服务器端:

 

    

第一步:用指定的端口号和服务器的ip建立一个EndPoint对像;

第二步:建立一个Socket对像;

第三步:用socket对像的Bind()方法绑定EndPoint;

第四步:用socket对像的Listen()方法开始监听;

第五步: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;

第六步:通信结束后一定记得关闭socket;
代码

using System;
using System.Collections.Generic;
using System.Text;
using System.Net;
using System.Net.Sockets;

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


            /**////创建终结点(EndPoint)
             IPAddress ip  = IPAddress.Parse(host);//把ip地址字符串转换为IPAddress类型的实例
             IPEndPoint ipe = new IPEndPoint(ip, port);//用指定的端口和ip初始化IPEndPoint类的新实例


            /**////创建socket并开始监听
             Socket s = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);//创建一个socket对像,如果用udp协议,则要用SocketType.Dgram类型的套接字
             s.Bind(ipe);//绑定EndPoint对像(2000端口和ip地址)
             s.Listen(0);//开始监听
             Console.WriteLine("等待客户端连接");


            /**////接受到client连接,为此连接建立新的socket,并接受信息
             Socket temp = s.Accept();//为新建连接创建新的socket
             Console.WriteLine("建立连接");
            string recvStr = "";
            byte[] recvBytes = new byte[1024];
            int bytes;
             bytes = temp.Receive(recvBytes, recvBytes.Length, 0);//从客户端接受信息
             recvStr += Encoding.ASCII.GetString(recvBytes, 0, bytes);


            /**////给client端返回信息
             Console.WriteLine("server get message:{0}", recvStr);//把客户端传来的信息显示出来
            string sendStr = "ok!Client send message successful!";
            byte[] bs = Encoding.ASCII.GetBytes(sendStr);
             temp.Send(bs, bs.Length, 0);//返回信息给客户端
             temp.Close();
             s.Close();
             Console.ReadLine();
         }
       
     }
}


Server运行结果:

 

 

 

客户端:

第一步:用指定的端口号和服务器的ip建立一个EndPoint对像;

第二步:建立一个Socket对像;

第三步: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;

第四步:如果连接成功,就用socket对像的Send()方法向服务器发送信息;

第五步:用socket对像的Receive()方法接受服务器发来的信息 ;

第六步:通信结束后一定记得关闭socket;

 

代码:

using System;
using System.Collections.Generic;
using System.Text;
using System.Net;
using System.Net.Sockets;

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

                /**////创建终结点EndPoint
                 IPAddress ip = IPAddress.Parse(host);
                //IPAddress ipp = new IPAddress("127.0.0.1");
                 IPEndPoint ipe = new IPEndPoint(ip, port);//把ip和端口转化为IPEndpoint实例


                /**////创建socket并连接到服务器
                 Socket c = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);//创建Socket
                 Console.WriteLine("Conneting…");
                 c.Connect(ipe);//连接到服务器


                /**////向服务器发送信息
                string sendStr = "hello!This is a socket test";
                byte[] bs = Encoding.ASCII.GetBytes(sendStr);//把字符串编码为字节
                 Console.WriteLine("Send Message");
                 c.Send(bs, bs.Length, 0);//发送信息


                /**////接受从服务器返回的信息
                string recvStr = "";
                byte[] recvBytes = new byte[1024];
                int bytes;
                 bytes = c.Receive(recvBytes, recvBytes.Length, 0);//从服务器端接受返回信息
                 recvStr += Encoding.ASCII.GetString(recvBytes, 0, bytes);
                 Console.WriteLine("client get message:{0}", recvStr);//显示服务器返回信息

                /**////一定记着用完socket后要关闭
                 c.Close();

             }
            catch (ArgumentNullException e)
             {
                 Console.WriteLine("argumentNullException: {0}", e);
             }
            catch (SocketException e)
             {
                 Console.WriteLine("SocketException:{0}", e);
             }

             Console.WriteLine("Press Enter to Exit");
         }
     }
}