Accessing the close button on a window UWP C#

Question

I have done some researching and I haven't found much that is useful for UWP. When the 'X' is hit on the window I need to call a function before the application actually closes. I can't seem to find any sources that deal with MVVM Cross and UWP. It seems that there may be a way but there is just simply a lack of resources online. I am really just looking to be pointed in the right direction.

Answer 1

When you create a Blank App and go to App.xaml.cs you should see an event in the end of the file OnSuspending

See Below

/// <summary>
/// Invoked when application execution is being suspended.  Application state is saved
/// without knowing whether the application will be terminated or resumed with the contents
/// of memory still intact.
/// </summary>
/// <param name="sender">The source of the suspend request.</param>
/// <param name="e">Details about the suspend request.</param>
private void OnSuspending(object sender, SuspendingEventArgs e)
{
    var deferral = e.SuspendingOperation.GetDeferral();
    //TODO: Save application state and stop any background activity
    deferral.Complete();
}

This is what you are looking for.