Question

I need to save to an isolated storage the total time that the user spent on an application.

I think I should know the time of starting and finishing execution.

If there is any way to do that please..

Thanks..

Answer 1

There are couple methods in the App.xaml.cs file that are directly related to the execution model:

• Application_Launching
• Application_Activated
• Application_Deactivated
• Application_Closing

You can hook this methods and provide there needed logic which, actually, is pretty straightforward:

• Application_Launching – initialize spentTime;
• Application_Activated – restore spentTime from State;
• Application_Deactivated – recalculate time and store to State to be able to get it further;
• Application_Closing – recalculate and store spentTime to Isolated Storage.

Some useful links for understanding WP Execution Model:

• Execution Model Overview for Windows Phone
• Execution Model Best Practices for Windows Phone