c# UDP Socket

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/i1tws/article/details/86624951

    public class UDPSocket
    {
        private Socket _client;
        private string _remoteHost;
        private int _remotePort;
        private IPEndPoint _remoteEP;
        private int _localPort;
        private bool _isStopThread = false;
        private Action<string> _cbReceiveMessage = null;

        /// <summary>
        /// 
        /// </summary>
        /// <param name="localPort">本地Port</param>
        /// <param name="remoteHost">远程IP(目标主机IP)</param>
        /// <param name="remotePort">远程Port(目标主机Port)</param>
        /// <param name="cbReceiveMessage">接收消息回调</param>
        public UDPSocket(int localPort,string remoteHost, int remotePort,Action<string> cbReceiveMessage)
        {
            _remoteHost = remoteHost;
            _remotePort = remotePort;
            _remoteEP = new IPEndPoint(IPAddress.Parse(_remoteHost), _remotePort);
            _localPort = localPort;
            _cbReceiveMessage = cbReceiveMessage;

            //绑定本地端口
            IPEndPoint localEP = new IPEndPoint(IPAddress.Any, _localPort);
            _client = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
            _client.Bind(localEP);

            //异步接收消息
            Thread tdRecv = new Thread(OnRecvThread);
            tdRecv.IsBackground = true;
            tdRecv.Start();
        }

        public void Close()
        {
            _isStopThread = true;
            if (_client != null) _client.Close();
            _client = null;
        }

        private void OnRecvThread()
        {
            try
            {
                while (true)
                {
                    if(_isStopThread)
                    {
                        return;
                    }

                    byte[] buffer = new byte[1024];
                    EndPoint point = new IPEndPoint(IPAddress.Any, 0);//保存发送方的ip和端口号
                    int length = _client.ReceiveFrom(buffer, ref point);//线程阻塞  接收消息
                    string msg = Encoding.ASCII.GetString(buffer, 0, length);//

                    if (_cbReceiveMessage != null)
                        _cbReceiveMessage(msg);
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
        }

        public void Send(string message)
        {
            byte[] data = Encoding.Default.GetBytes(message);//字符串与字节数组相互转换
            _client.SendTo(data, _remoteEP); //发送信息
        }

        
    }