C# 判断是否联网

?

public static class Internet

    {

        [DllImport("winInet.dll")]

        private static extern bool InternetGetConnectedState(ref int dwFlag, int dwReserved);

      

        /// <summary>

        /// 返回网络状态

        /// </summary>

        public static bool Status

        {

            get

            {

                Int32 dwFlag = new int();

                if (!InternetGetConnectedState(ref dwFlag, 0))

                {

                    return false;

                }

                else

                {

                    return true;

                }

            }

        }

    }