public bool conn(string ip, int port)
        {
            try
            {
                IPAddress hostIP = IPAddress.Parse(ip);// 这句上按F10后，就报异常了

                IPEndPoint ipLocalEndPoint = new IPEndPoint(hostIP, port);

                llrpSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);                
                llrpSocket.Connect(ipLocalEndPoint);
                return true;
            }
            catch (Exception)
            {
                return false;
            }
        }