发一个c#写的UDP通信的代码

程序主要两个部分，一个发送消息，一个监听消息，具体看代码吧。
可用于两个程序之间的通讯，也可以实现简单的聊天。

    public class UDPListen
    {
        private string state = "close";

        public string State
        {
            get { return state; }
        }

        //自定义事件，当收到请求数据时
        public event msgReceiptHandler msgReceiptEvent;

        System.Net.IPAddress IP; //要进行监听的IP
        System.Net.IPEndPoint S_Point; //要进行监听的端口
        System.Net.Sockets.UdpClient sv;//用于监听的UDP实列

        System.Net.IPEndPoint C_Point;//请求信息的主机信息

        bool con = true;//是否继承监听

        //构造函数
        public UDPListen(string hostIP, int point)
        {
            IP = System.Net.IPAddress.Parse(hostIP);
            S_Point = new System.Net.IPEndPoint(IP, point);
            sv = new System.Net.Sockets.UdpClient(S_Point);
        }

        //开始监听
        public void open()
        {
            if (con)
            {
                state = "open";
                try
                {
                    //Receive方法将阻塞进行，直到得到请求信息
                    //参数ref C_Point将得到请求信息的主机信息

                    byte[] msg = sv.Receive(ref C_Point);

                    //事件参数
                    msgReceiptEventArg e = new msgReceiptEventArg();
                    e.data = System.Text.Encoding.UTF8.GetString(msg);
                    e.requestIP = C_Point.Address.ToString();
                    e.requestPoint = C_Point.Port.ToString();

                    //如果有事件绑定，就触发事件
                    if (msgReceiptEvent != null)
                    { msgReceiptEvent(this, e); }
                }
                catch
                {
                    close();
                }

                open();//回调本方法，进行下一监听
            }
        }

        //停止监听
        public void close()
        {

            con = false;//是否继承监听标志为假
            sv.Close(); //关闭用于监听的UDP实列
            state = "close";
        }
    }

    //自定义事件，当收到请求数据时,的委托
    public delegate void msgReceiptHandler(object sender, msgReceiptEventArg e);

    //自定义事件参数
    public class msgReceiptEventArg : System.EventArgs
    {
        public string data;
        public string requestIP;
        public string requestPoint;
    }

//***********************************************************************************

using System;
using System.Collections.Generic;
using System.Text;
using System.Xml;
using Hyey.Components.Configuration;

namespace Hyey.Components.UDPCommunication
{
    public class UDPSend
    {
        System.Net.Sockets.UdpClient UDP_C; //用于请求的UDP实列

        //构造函数
        public UDPSend(string host, int point)
        {
            UDP_C = new System.Net.Sockets.UdpClient();
            UDP_C.Connect(host, point);
        }

        //发送请求信息
        public void sendMsg(string s)
        {
            byte[] msg = System.Text.Encoding.UTF8.GetBytes(s);
            UDP_C.Send(msg, msg.Length);
        }

 

 

        #region

        private static readonly UDPSend _udpsend = null;

        static UDPSend()
        {

            XmlNode UDPNode = HyeyConfiguration.GetConfig().GetConfigSection("hyeyFrame/UDPCommunication");
            XmlAttribute hostAttribute = UDPNode.Attributes["Host"];
            XmlAttribute pointAttribute = UDPNode.Attributes["Point"];

            _udpsend = new UDPSend(hostAttribute.Value, Convert.ToInt32( pointAttribute.Value ) );
        }
        public static UDPSend Instance()
        {
            return _udpsend;
        }
        private UDPSend()
        {
           
        }

        #endregion

 

    }

 

 

}

//************************************************************************************
使用，建立一个win工程，下面是Form1的代码

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace wxwinter.wf.UDPCommunication
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            send.sendMsg(this.textBox1.Text);
        }

        UDPListen listen;
        UDPSend send;
        System.Threading.Thread 线程;
        private void Form1_Load(object sender, EventArgs e)
        {
            listen = new UDPListen("192.168.1.20",7788);
            System.Threading.ThreadStart 线程方法;
            线程方法 = new System.Threading.ThreadStart(listen.open);
          
            listen.msgReceiptEvent += new msgReceiptHandler(listen_msgReceiptEvent);

            线程 = new System.Threading.Thread(线程方法);
            线程.Start();

            send = new UDPSend("192.168.1.20", 7788);

        }
        //当收到请求数据时,事件
        private void listen_msgReceiptEvent(object sender, msgReceiptEventArg e)
        {
            this.Invoke(new ThreadUIHandle(ThreadUIHandleMethod), new object[] { e.data });
           
        }
        delegate void ThreadUIHandle(object data);
        void ThreadUIHandleMethod(object data)
        {
            this.textBox2.Text =this.textBox2.Text +  data.ToString() +"\n";
        }

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            listen.close();
            线程.Abort();
          

        }
    }
}