In some programs, you may want to detect if the network is connected, but do not want to consume too much system resources, the following method is to directly call the system API to detect.
Method definition
[DLLIMPORT ("Wininet.dll")]]]]]
Private Extern Static Bool InternetGetConnectedState (Out Int ConnectionDescription, Int ReservedValue);
2. Method Description
parameter:
ConnectionDescription: Connection Description
ReservedValue: Reserved value
return value:
True: on line
False: off line
3. Calling method
a. You must reference System.Runtime.InteropServices in your code, otherwise, there will be compilation errors
b. Define a variable INT i = 0;
c. Call Bool State = InternetGetConnectedState (OUT I, 0);
Complete code:
using System.Runtime.InteropServices; namespace internet {public class Class1 {[DllImport ( "wininet.dll")] private extern static bool InternetGetConnectedState (out int connectionDescription, int reservedValue); public Class1 () {} private bool IsConnected () { INT i = 0; BOOL State = InternetGetConnectedState (OUT I, 0); Return State;}}}}
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