TCP/UDP通讯

namespace UDPServer {     class Program     {         static void Main(string[] args)         {             int recv;             byte[] data = new byte[1024];             //构建TCP 服务器             //得到本机IP，设置TCP端口号                     IPEndPoint ipep = new IPEndPoint(IPAddress.Any , 8001);             Socket newsock = new Socket(AddressFamily.InterNetwork, SocketType.Dgram , ProtocolType.Udp);             //绑定网络地址             newsock.Bind(ipep);             Console.WriteLine("This is a Server, host name is {0}",Dns.GetHostName());             //等待客户机连接             Console.WriteLine("Waiting for a client...");             //得到客户机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 ));             //客户机连接成功后，发送欢迎信息             string welcome = "Welcome ! ";             //字符串与字节数组相互转换             data  = Encoding .ASCII .GetBytes (welcome );             //发送信息             newsock .SendTo (data ,data.Length ,SocketFlags .None ,Remote );             while (true )             {                 data =new byte [1024];                 //发送接受信息                 recv =newsock.ReceiveFrom(data ,ref Remote);                 Console .WriteLine (Encoding .ASCII .GetString (data ,0,recv));                 newsock .SendTo (data ,recv ,SocketFlags .None ,Remote );             }         }         }     } *********************************************************************************

using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Net; using System.Net.Sockets; namespace UDPClient {     class Program     {         static void Main(string[] args)         {             byte[] data = new byte[1024];             string input ,stringData;             //构建TCP 服务器             Console.WriteLine("This is a Client, host name is {0}", Dns.GetHostName()); //设置服务IP，设置TCP端口号             IPEndPoint ipep = new IPEndPoint(IPAddress .Parse ("127.0.0.1") , 8001);             //定义网络类型，数据连接类型和网络协议UDP             Socket server = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);             string welcome = "Hello! ";             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 ();                    }         }     } ***************************************************************************

C# code//"开始"按钮事件   private void button1_Click(object sender, System.EventArgs e) {   //取得预保存的文件名   string fileName=textBox3.Text.Trim();   //远程主机   string hostName=textBox1.Text.Trim();   //端口   int port=Int32.Parse(textBox2.Text.Trim());   //得到主机信息   IPHostEntry ipInfo=Dns.GetHostByName(hostName);   //取得IPAddress[]