判断计算机当前的网络是否连接

using System.Runtime.InteropServices;
[DllImport("wininet.dll")]

        private extern static bool InternetGetConnectedState(out int connectionDescription, int reservedValue);

private static bool IsConnected()
        {

            int I = 0;

            bool state = InternetGetConnectedState(out I, 0);

            return state;

        }

        static void Main(string[] args)
        {
            Console.WriteLine(IsConnected().ToString());
        }