怎样检测指定IP和端口

Question

这是我的方法 但这个方法在检测比较多的数据的时候非常卡 foreach (DataGridViewRow row in this.Dgvdete.Rows)
      
     {
              string ips= row.Cells[0].Value.ToString();
              string port= row.Cells[1].Value.ToString();
              IPAddress ip = IPAddress.Parse(ips);
              DataGridViewImageCell imgcell = (DataGridViewImageCell)row.Cells[2];
              imgcell.Value = imageList1.Images[1];
              try
              {
                      IPEndPoint point = new IPEndPoint(ip, Convert.ToInt32(port));
                      Socket sock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
                      sock.SendTimeout = 1;
                      sock.Connect(point);
                      imgcell.Value = imageList1.Images[0];
                  //Execute(string dosCommand, int milliseconds)
              }
              catch
              {
                  imgcell.Value = imageList1.Images[1];
              }
            }希望哪位同行能告诉我比较快捷的检测方法！

Answer 1

使用异步去连接BeginConnect或者直接去Ping

Answer 2

Ping我也用过可以设置过期时间！但我门经理不用ping异步是怎么连接啊！能给我一段代码吗？谢谢！！！！！！

Answer 3

Socket s = new Socket(lep.Address.AddressFamily,
                                   SocketType.Stream,
                                         ProtocolType.Tcp);s.BeginConnect(lep, new AsyncCallback(ConnectCallback), s);
private static void ConnectCallback(IAsyncResult ar) {
        try {
            // Retrieve the socket from the state object.
            Socket client = (Socket) ar.AsyncState;            // Complete the connection.
            client.EndConnect(ar);            Console.WriteLine("Socket connected to {0}",
                client.RemoteEndPoint.ToString());            // Signal that the connection has been made.
        } catch (Exception e) {
            Console.WriteLine(e.ToString());
        }
    }以上摘自MSDN

Answer 4

对了，可以 BeginConnect 也可以 AsynchronousSocket

Answer 5

兄弟因为我对Socket 这一块不熟所以不知道那个lep是怎么实例化的！！！！！

Answer 6

因为同步的连接无法设置连接超时时间，等待连接的过程中界面会死掉。 IPHostEntry lipa = Dns.Resolve("host.contoso.com");
IPEndPoint lep = new IPEndPoint(lipa.AddressList[0], 11000);       Socket s = new Socket(lep.Address.AddressFamily,
                                   SocketType.Stream,
                                         ProtocolType.Tcp);
       try{                 while(true){
                 allDone.Reset();                 Console.WriteLine("Establishing Connection");
                 s.BeginConnect(lep, new AsyncCallback(Async_Send_Receive.Connect_Callback), s);                 allDone.WaitOne();
            }
       }
       catch (Exception e){
            Console.WriteLine(e.ToString());
       }
哈哈

Answer 7

连接不上的站大多数吗？如果是的话，那可不能把连接失败的处理代码方在catch{}中！那样会很慢的！