C # establishes a UDP server and receives client data

Server-Side object class Library:

Using system;using system.collections.generic;using system.linq;using system.text;using System.Net.Sockets;using System.net;using system.threading;using system.io;namespace udpchatexample{//<summary>//UDP server object//        </summary> public class Udpserverclass {public delegate void MessageHandler (string Message);//define Delegate Events        public event MessageHandler messagearrived; Public Udpserverclass () {//Get the native available IP address ipaddress[] ips = dns.gethostaddresses (dns.gethostname            ()); foreach (IPAddress IPA in IPs) {if (IPA.                    AddressFamily = = addressfamily.internetwork) {myipaddress = ipa;//get local IP address                Break            }} Note_stringbuilder = new StringBuilder ();        PortName = 8080;        } public UdpClient receiveudpclient; <summary>///Listening port name///</summary> PubLIC int portname;        <summary>///Local address///</summary> public ipendpoint localipendpoint;        <summary>///Log Records///</summary> public StringBuilder Note_stringbuilder;        <summary>///local IP address///</summary> public IPAddress myipaddress;            public void Thread_listen () {//Create a thread to receive the information sent from the remote host thread myThread = new Thread (receivedata);            Mythread.isbackground = true;        Mythread.start ();            }///<summary>///Receive data///</summary> private void Receivedata () {            IPEndPoint local = new IPEndPoint (myipaddress, portname);            Receiveudpclient = new UdpClient (local);            IPEndPoint remote = new IPEndPoint (ipaddress.any, 0);                  while (true) {try {//close udpclient This sentence produces an exception  byte[] Receivebytes = receiveudpclient.receive (ref remote);                    String receiveMessage = Encoding.Default.GetString (receivebytes, 0, receivebytes.length);                    ReceiveMessage = ASCIIEncoding.ASCII.GetString (receivebytes, 0, receivebytes.length); Messagearrived (String.                    Format ("{0} from {1}:{2}", DateTime.Now.ToString (), remote, receiveMessage));                    Try//{//byte[] sendbytes = Encoding.ASCII.GetBytes ("Is anybody there?");                    Receiveudpclient.send (Sendbytes, sendbytes.length, local);                }//catch (Exception e)//{//}//break;                } catch {break;        }}}///<summary>//Add log information to Note_stringbuilder///</summary> public void Addmessage_notE_stringbuilder () {}}} 

Interface Simple code:

Using system;using system.collections.generic;using system.componentmodel;using system.data;using System.Drawing; Using system.linq;using system.text;using system.windows.forms;namespace udpchatexample{public partial class UDPServe        Rform:form {public udpserverform () {InitializeComponent ();        } public delegate void Delegatechangetext (string Messages); void Changetxt (String Messages) {string sbtext = SB.            ToString (); SB. Remove (0, SB.)            Length); SB.            Append (Messages + "\ r \ n" + sbtext); richTextBox1.Text = SB.        ToString ();        } StringBuilder SB = new StringBuilder ();        private void Udpserverform_load (object sender, EventArgs e) {} Udpserverclass UDPServerClass1;            private void Button1_Click (object sender, EventArgs e) {UDPServerClass1 = new Udpserverclass ();            Udpserverclass1.thread_listen (); Udpserverclass1.messagearrived + = new Udpserverclass.messagehandler (udpserverclass1_messagearrived); } void Udpserverclass1_messagearrived (String Message) {RichTextBox1.        Invoke (New Delegatechangetext (Changetxt), Message); private void Udpserverform_formclosing (object sender, FormClosingEventArgs e) {System.environ ment.        Exit (System.Environment.ExitCode); }    }}

C # establishes a UDP server and receives client data