1 Udp的监听
2 this.serverSocket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
3                 this.serverSocket.SetSocketOption(SocketOptionLevel.Socket,SocketOptionName.ReuseAddress,true);
4                 this.serverSocket.Bind(new IPEndPoint(IPAddress.Parse("192.168.1.12"), port));
5                 EndPoint remoteEP = new IPEndPoint(IPAddress.Any, 0);
6                 this.serverSocket.BeginReceiveFrom(this.buff, 0, this.buff.Length, SocketFlags.None, ref remoteEP, new AsyncCallback(this.Receive), remoteEP);

Udp的关闭
if (this.serverSocket != null){this.serverSocket.Close();this.serverSocket = null;}

当在进行关闭的时候，可能就出现错误，这个应该是多线程资源同步到问题，主线程进行了关闭，然而Udp线程也同样在访问socket，socket都释放了，而Udp线程却还在进行，因此产生异常；

解决的方法很简单，在Udp中访问serverSokcet加一个线程锁，再关闭的时候就应该不会产生异常了！

如下：

private void Receive(IAsyncResult ar){IPEndPoint point = new IPEndPoint(IPAddress.Any, 0);EndPoint endPoint = point;try{lock (locker){if (serverSocket != null){int num = this.serverSocket.EndReceiveFrom(ar, ref endPoint);List<byte> recBytes = new List<byte>();for (int i = 0; i < num; i++){recBytes.Add(this.buff[i]);}this.OnDataReceived(new DataReceivedEventArgs(endPoint, recBytes));}}}catch{}finally{lock (locker){if(serverSocket!=null)this.serverSocket.BeginReceiveFrom(this.buff, 0, this.buff.Length, SocketFlags.None, ref endPoint, new AsyncCallback(this.Receive), endPoint);}}}

public void Close(){           lock (locker){if (this.serverSocket != null){this.serverSocket.Close();this.serverSocket = null;}}}