From boitboy on 2013-07-10 18:21:08
C#判断是否连接外网
[DllImport("winInet.dll")]
private static extern bool InternetGetConnectedState(ref int dwFlag, int dwReserved);
private const int INTERNET_CONNECTION_MODEM = 1;
private const int INTERNET_CONNECTION_LAN = 2;
/// <summary>
/// 判断本机是否联网
/// </summary>
/// <returns></returns>
public static bool IsConnectNetwork()
{
try
{
int dwFlag = 0;
//false表示没有连接到任何网络,true表示已连接到网络上
if (!InternetGetConnectedState(ref dwFlag, 0))
{
//if (!InternetGetConnectedState(ref dwFlag, 0))
// Console.WriteLine("未连网!");
//else if ((dwFlag & INTERNET_CONNECTION_MODEM) != 0)
// Console.WriteLine("采用调治解调器上网。");
//else if ((dwFlag & INTERNET_CONNECTION_LAN) != 0)
// Console.WriteLine("采用网卡上网。");
return false;
}
//判断当前网络是否可用
IPAddress[] addresslist = Dns.GetHostAddresses(
www.baidu.com);
if (addresslist[0].ToString().Length <= 6)
{
return false;
}
}
catch (Exception ex)
{
return false;
}
return true;
}
