c#通过winAPI函数InternetGetConnectedState获得本地系统的网络连接状态

    /// <summary>
    /// 检测网络状态
    /// </summary>
    class NativeMethods
    {
        //检测网络状态
        [DllImport("wininet.dll", EntryPoint = "InternetGetConnectedState")]
        public extern static bool InternetGetConnectedState(out int conState, int reder);
        public static bool CheckInternet()
        {
            int Desc = 0;
            return InternetGetConnectedState(out Desc, 0);
        }
    }