问题
In Windows 7 whenever the internet access gets lost, the network indicator turns yellow. I want to get this status in my software and set an alarm whenever the internet connection gets lost (an internet alarm). How can I get this status? All of the other libraries like this one, just show the status of disconnection (red) and otherwise say that the internet is available. I couldn't find any library that does this nor any API function.
回答1:
In the Windows API Code Pack there is a NetworkManager class that gets you both IsConnected and IsConnectedToInternet. Comes with some useful samples too. If you want to detect a change in status, do not poll - there are .NET events you can add handlers for just like adding a click handler.
Also see Detect Internet V. local lan connection, An elegant / simple way to check whether internet is available or not, I need a event to detect Internet connect/disconnect, etc.
回答2:
You could modify the network libary you found. Just look at the Network Interface Class.
OperationalStatus can be more that up and down :)
来源：https://stackoverflow.com/questions/6197954/get-windows-7s-network-status