方式一:
[DllImport("wininet")]
private extern static bool InternetGetConnectedState(out int connectionDescription, int reservedValue);
bool GetConnectedState()
{
try
{
int i = 0;
if (InternetGetConnectedState(out i, 0))
return true;
else
return false;
}
catch (System.Exception ex)
{
return false;
}
}
方式二:
bool GetConnectedStateA()
{
try
{
Ping ping = new Ping();
PingOptions poptions = new PingOptions();
poptions.DontFragment = true;
string data = string.Empty;
byte[] buffer = Encoding.ASCII.GetBytes(data);
int timeout = 1000;
PingReply reply = ping.Send("192.168.1.100"), timeout, buffer, poptions);
if (reply.Status == IPStatus.Success)
return true;
else
return false;
}
catch (System.Exception ex)
{
return false;
}
}