public bool CheckForInternetConnection()
{
bool result = false;
try
{
Ping ping = new Ping();
PingReply replay = ping.Send("114.114.114.114", 2000);
if (replay.Status == IPStatus.Success)
{
result = true;
}
}
catch { }
return result;
}方法二
public bool CheckForInternetConnection()
{
bool result = false;
try
{
using (WebClient client = new WebClient())
{
client.DownloadString("http://www.baidu.com/");
result = true;
}
}
catch { }
return result;
}说明：NetworkInterface.GetIsNetworkAvailable()仅用于检测是否有可用的网络连接(网卡)，不能用于检测计算机是否联网。例如拨号上网的计算机，没有拨号时也是返回True。
参考资料
[1].C# checking Internet connection：http://stackoverflow.com/questions/20309158/c-sharp-checking-internet-connection
[2].How do I check for a network connection：http://stackoverflow.com/questions/520347/how-do-i-check-for-a-network-connection
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