static void Main(string[] args)

        {

            Console.WriteLine("请输入ip");

            string ip = Console.ReadLine();

            Parallel.For(1, 65535, i => scan(ip, i, 200));

            Console.WriteLine("扫描完成");

        }

        public static void scan(string ip, int port, int timeout)

        {

            TcpClient tc = new TcpClient();

            tc.ReceiveTimeout = timeout;

            try

            {

                tc.Connect(ip, port);

                if (tc.Connected)

                {

                    Console.WriteLine("Port {0} is Open", port.ToString().PadRight(6));

                    Console.WriteLine("连接成功！！！");

                }

            }

            catch

            {

                //Console.WriteLine("Port {0} is Closed", port.ToString().PadRight(6));

            }

            finally

            {

                tc.Close();

                tc = null;

            }

        }