C#检测本机是否联网

public class Net
{
[DllImport("wininet")]
private extern static bool InternetGetConnectedState(out int connectionDescription, int reservedValue);

/// <summary>
/// 检测本机是否联网
/// </summary>
/// <returns></returns>
public static bool IsConnectedInternet()
{
int i = 0;
if (InternetGetConnectedState(out i, 0))
{
//已联网
return true;
}
else
{
//未联网
return false;
}

}

}

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