C# UDPClient 重复使用端口

Question

我自己创建了一个 名为UDP_Socket的控件,项目中多个Form都要使用该控件,该控件里有个UDPClient对象指向本机某个端口,每次调用初始化该控件,会出现端口重复使用异常!请高手帮忙解决.using System;
using System.ComponentModel;
using System.Collections.Generic;
using System.Diagnostics;
using System.Text;
using System.Net.Sockets;
using System.Net;
using System.Windows.Forms;
using System.Threading;namespace QQ_Class
{
    public partial class Udp_Socket : Component
    {
        private IPEndPoint ServerEndPoint = null;
        private UdpClient UDP_Server = new UdpClient();
        private System.Threading.Thread Thd_UDP;        public delegate void DataArrivalEventHandler(byte[] Data, IPAddress ip, int port);
        public event DataArrivalEventHandler DataArrival;
         
       
        private string localHost = "127.0.0.1";
        [Browsable(true), Category("Local"), Description("本地IP地址")]   //在“属性”窗口中显示localHost属性
        public string LocalHost
        {
            get { return localHost; }
            set { localHost = value; }
        }
      
        private int localPort=1234;
        [Browsable(true), Category("Local"), Description("本地端口号")] //在“属性”窗口中显示localPort属性
        public int LocalPort
        {
            get { return localPort; }
            set { localPort = value; }
        }         private bool active = false;
        [Browsable(true), Category("Local"), Description("激活监听")]   //在“属性”窗口中显示active属性            public bool Active
        {
            get { return active; }
            set
            {
                active = value;
                if (active)
                {
                    OpenSocket();
                }
                else
                {
                    CloseSocket();
                }
            }
        }       
        public Udp_Socket()
        {
            InitializeComponent(); 
        }        public Udp_Socket(IContainer container)
        {
            container.Add(this);    
            InitializeComponent();
        }        
        protected void Listener()
        {
            if (UDP_Server != null)
                UDP_Server.Close();            ServerEndPoint = new IPEndPoint(IPAddress.Any, localPort);            UDP_Server = new UdpClient(localPort, AddressFamily.InterNetwork); //////// 此处出现异常
            
            try
            {
                Thd_UDP = new Thread(new ThreadStart(GetUDPData));
                Thd_UDP.Start();
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.ToString());
            }
        }        private void GetUDPData()
        {
            while (active)
            {
                byte[] Data = UDP_Server.Receive(ref ServerEndPoint);                if (DataArrival != null)
                {
                    DataArrival(Data, ServerEndPoint.Address, ServerEndPoint.Port);
                }
                Thread.Sleep(0);            }
        }        private void CallBackMethod(IAsyncResult ar)
        {
            DataArrivalEventHandler dh = (DataArrivalEventHandler)ar.AsyncState;
            dh.EndInvoke(ar);
        }        public void Send(IPAddress host, int port, byte[] data)
        {
          
                IPEndPoint server = new IPEndPoint(host, port);                UDP_Server.Send(data, data.Length, server);
            
        }        private void OpenSocket()
        {
            Listener();
        }        private void CloseSocket()
        {
            if (UDP_Server != null)
                UDP_Server.Close();
            if (Thd_UDP != null)
            {
             //   Thread.Sleep(30);
             //   Thd_UDP.Abort();
                Thd_UDP.Abort();
            }
        }    }
}

Answer 1

这个简单，你不同的地方创建这个控制的时候，都调用LocalPort属性设置不同的端口号就行了，

Answer 2

我的QQ即使通信系统,要根据IP和端口号传递信息实现即使聊天,该端口号肯定是不行的!没办法,每次调用前,先关闭UDP_Client,再重新开启,这也是我最不希望的!这会引起其他地方的异常,唉,就这样吧,只能改其他的部分了,这个没有搞不定!