Call back to Shared Application from Target Application in Windows Store App

Question

I have a browser application that allows me to store files in the local space and displays a list of all the files present.

My application can be considered a sharing application.

Now in my application as soon as i click on a file, the file is opened in a target application, for example if i click on a PDF document, the file is opened by the Acrobat Reader Application.

I am trying to detect a call back inside my sharing application from the target application, triggered as soon as the user closes the target application that currently is displaying a file that is only present in my local app space.

Answer 1

As far as I can understand what you are trying to achieve is to find a trigger which informs that your application is again visible to user now. For this you you can use VisibilityChanged event like this

Window.Current.VisibilityChanged += Current_VisibilityChanged;

and also if your app was suspended by the OS then you need to handle this in App.Xaml.cs in OnActivated event or create a new event for app resuming available in this.Resuming