c#判断网络连接状态

运行效果

using system;
using system.collections.generic;
using system.text;
using system.net.networkinformation;

namespace consoleapplication1
{
    class program
    {
        public static void main(string[] args)
        {
            string url = "www.baidu.com;www.sina.com;www.cnblogs.com;www.google.com;www.163.com;www.csdn.com";
            string[] urls = url.split(new char[] { ';' });
            checkservestatus(urls);

            console.readkey();
        }

        /// <summary>
        /// 检测网络连接状态
        /// </summary>
        /// <param name="urls"></param>
        public static void checkservestatus(string[] urls)
        {
            int errcount = 0;//ping时连接失败个数

            if (!localconnectionstatus())
            {
                console.writeline("网络异常~无连接");
            }
            else if (!myping(urls, out errcount))
            {
                if ((double)errcount / urls.length >= 0.3)
                {
                    console.writeline("网络异常~连接多次无响应");
                }
                else
                {
                    console.writeline("网络不稳定");
                }
            }
            else
            {
                console.writeline("网络正常");
            }
        }

        #region 网络检测

         private const int internet_connection_modem = 1;
        private const int internet_connection_lan = 2;

        [system.runtime.interopservices.dllimport("wininet.dll")]
        private static extern bool internetgetconnectedstate(ref int dwflag, int dwreserved);

        /// <summary>
        /// 判断本地的连接状态
         /// </summary>
        /// <returns></returns>
        private static bool localconnectionstatus()
        {
            system.int32 dwflag = new int32();
            if (!internetgetconnectedstate(ref dwflag, 0))
            {
                console.writeline("localconnectionstatus--未连网!");
                return false;
            }
            else
            {
                if ((dwflag & internet_connection_modem) != 0)
                {
                    console.writeline("localconnectionstatus--采用调制解调器上网。");
                    return true;
                }
                else if ((dwflag & internet_connection_lan) != 0)
                {
                    console.writeline("localconnectionstatus--采用网卡上网。");
                    return true;
                }
            }
            return false;
        }

        /// <summary>
        /// ping命令检测网络是否畅通
        /// </summary>
        /// <param name="urls">url数据</param>
        /// <param name="errorcount">ping时连接失败个数</param>
        /// <returns></returns>
        public static bool myping(string[] urls, out int errorcount)
        {
            bool isconn = true;
            ping ping = new ping();
            errorcount = 0;
            try
            {
                pingreply pr;
                for (int i = 0; i < urls.length; i++)
                {
                    pr = ping.send(urls[i]);
                    if (pr.status != ipstatus.success)
                    {
                        isconn = false;
                        errorcount++;
                    }
                    console.writeline("ping " + urls[i] + "    " + pr.status.tostring());
                }
            }
            catch
            {
                isconn = false;
                errorcount = urls.length;
            }
            //if (errorcount > 0 && errorcount < 3)
            //  isconn = true;
            return isconn;
        }

        #endregion
    }
}