UDP通信类，监听本机指定端口，发送消息给指定电脑

using System;
using System.Collections.Generic;
using System.Text;
//添加的命名空间引用
using System.Net;
using System.Net.Sockets;
using System.Threading;
using System.Text.RegularExpressions;
namespace CoreMes.UDP
{
    class UDP
    {
        int remotePort;
        string remoteIp;
        int ReceviePort;
        IPEndPoint remotePoint;
        public delegate void ReceiverDataDel(string message);
        public event ReceiverDataDel ReceiverdataEvent; 
        /// <summary>
        /// 初始化
        /// </summary>
        /// <param name="remoteip">远程主机ip</param>
        /// <param name="remoteP">远程主机端口</param>
        /// <param name="port">本地主机端口</param>
        public UDP(string remoteip,int remoteP,int port)
        {
            this.remotePort = remoteP;
            this.ReceviePort = port;
            Regex ipRe = new Regex(@"2[0-4]\d|25[0-5]|1\d?\d?|[2-99]\.(2[0-4]\d|25[0-5]|0|1\d?\d?|[2-99]\.){2}2[0-4]\d|25[0-5]|0|1\d?\d?|[2-99]");
            if(ipRe.IsMatch(remoteip))
            {
                this.remoteIp = remoteip;
                remotePoint = new IPEndPoint(IPAddress.Parse(remoteIp), this.remotePort);
            }
            else
            {
                throw new Exception("ip地址格式不对");
            }
            //本地监听端口
            Thread receiverThread = new Thread(this.ReceiveData);
            receiverThread.IsBackground = true;
            receiverThread.Start();
        }
        /// <summary>
        /// 在后台运行的接收线程
        /// </summary>
        private void ReceiveData()
        {
            //在本机指定的端口接收
           UdpClient udpClient = new UdpClient(ReceviePort);
            IPEndPoint remote = null;
            //接收从远程主机发送过来的信息；
            while (true)
            {
                try
                {
                    //关闭udpClient时此句会产生异常
                    byte[] bytes = udpClient.Receive(ref remote);
                    string str = Encoding.UTF8.GetString(bytes, 0, bytes.Length);
                    //消息处理
                    if(ReceiverdataEvent!=null)
                    {
                        ReceiverdataEvent(remote.ToString()+":"+str);
                    }

                }
                catch(Exception ex)
                {
                    throw ex;
                }
            }
        }
        /// <summary>
        /// 发送数据到远程主机
        /// </summary>
        public void SendData(string message)
        {
            UdpClient myUdpClient = new UdpClient();  
            byte[] bytes = System.Text.Encoding.UTF8.GetBytes(message);
            try
            {
                myUdpClient.Send(bytes, bytes.Length, remotePoint);            
                myUdpClient.Close();             
            }
            catch (Exception err)
            {
                throw err;
            }
            finally
            {
                myUdpClient.Close();
            }
        }
    }
}