獲取網口的連接狀態

            NetworkInterface[] ips = NetworkInterface.GetAllNetworkInterfaces();
            foreach (NetworkInterface ni in ips)
            {
                GatewayIPAddressInformationCollection gifc = ni.GetIPProperties().GatewayAddresses;
                string ip = gifc[0].Address.ToString();
                OperationalStatus os = ni.OperationalStatus;
                //ni.OperationalStatus 
            }