C# 下實現UPD編程Demo

//Server端using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Net.Sockets;using System.Net;namespace UDP_Server{    class Program    {        static void Main(string[] args)        {            int recv;            byte[] data = new byte[1024];            //構建TCP 伺服器            //得到本機IP，設定TCP連接埠號碼                     IPEndPoint ipep = new IPEndPoint(IPAddress.Any, 8001);            Socket newsock = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);            //綁定網路地址            newsock.Bind(ipep);            Console.WriteLine("This is a Server, host name is {0}", Dns.GetHostName());            //等待客戶機串連            Console.WriteLine("Waiting for a client");            //得到客戶機IP            IPEndPoint sender = new IPEndPoint(IPAddress.Any, 0);            EndPoint Remote = (EndPoint)(sender);            recv = newsock.ReceiveFrom(data, ref Remote);            Console.WriteLine("Message received from {0}: ", Remote.ToString());            Console.WriteLine(Encoding.ASCII.GetString(data, 0, recv));            //客戶機串連成功後，發送歡迎資訊            string welcome = "shandong shangye zhiyejishuxueyuan";            //字串與位元組數組相互轉換            data = Encoding.ASCII.GetBytes(welcome);            //發送資訊            newsock.SendTo(data, data.Length, SocketFlags.None, Remote);            while (true)            {                data = new byte[1024];                //發送接受資訊                recv = newsock.ReceiveFrom(data, ref Remote);                Console.WriteLine(Encoding.ASCII.GetString(data, 0, recv));                newsock.SendTo(data, recv, SocketFlags.None, Remote);            }        }    }}

client端

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Net.Sockets;using System.Net;namespace UDP_Client{    class Program    {        static void Main(string[] args)        {            byte[] data = new byte[1024];            string input, stringData;            Console.WriteLine("This is a Client, host name is {0}", Dns.GetHostName());            IPEndPoint ipep = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 8001);            Socket server = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);            string welcome = "hello hengdadianqi";            data = Encoding.ASCII.GetBytes(welcome);            server.SendTo(data, data.Length, SocketFlags.None, ipep);            IPEndPoint sender = new IPEndPoint(IPAddress.Any, 0);            EndPoint Remote = (EndPoint)sender;            data = new byte[1024];            int recv = server.ReceiveFrom(data, ref Remote);            Console.WriteLine("Message received from {0}: ", Remote.ToString());            Console.WriteLine(Encoding.ASCII.GetString(data, 0, recv));            while (true)            {                input = Console.ReadLine();                if (input == "exit")                    break;                server.SendTo(Encoding.ASCII.GetBytes(input), Remote);                data = new byte[1024];                recv = server.ReceiveFrom(data, ref Remote);                stringData = Encoding.ASCII.GetString(data, 0, recv);                Console.WriteLine(stringData);            }            Console.WriteLine("Stopping Client.");            server.Close();         }    }}