Hook in befor App.Exit

Question

Here is my problem:

In my WPF application I have a MyBaseControl (derives from System.Windows.Controls.ContentControls) and a lot of MyCustomControls which derives from MyBaseControl. I need to do some storing and cleanup operations for all my MyCustomControls befor the application is closed. Here is some code:

public abstract class MyBaseControl : ContentControl
{
// Do some smart stuff.
}

App.Exit += new System.Windows.ExitEventHandler(App.App_OnExit);

In App_OnExit() I do the really last operations that need to be done. I tried to do my cleanup operations in the destructor of MyBaseControl but this is called after App_OnExit(). Same problem with AppDomain.CurrentDomain.ProcessExit.

The ContentControl.Closed and ContentControl.Unloaded events don't occour when I exit the application via ALT+F4.

Where can I hook in to do my cleanup operations?

Answer 1

Where can I hook in to do my cleanup operations?

In a Closing event handler for the parent window of the control:

public abstract class MyBaseControl : ContentControl
{
    public MyBaseControl()
    {
        Loaded += MyBaseControl_Loaded;
    }

    private void MyBaseControl_Loaded(object sender, RoutedEventArgs e)
    {
        Window parentWindow = Window.GetWindow(this);
        parentWindow.Closing += ParentWindow_Closing;
        Loaded -= MyBaseControl_Loaded;
    }

    private void ParentWindow_Closing(object sender, System.ComponentModel.CancelEventArgs e)
    {
        //cleanup...
    }
}