How to detect modifier key states in WPF?

Question

Is there some global constructs that I can use whenever I need to access whether the Control, Shift, Alt buttons are down? For instance inside MouseDown event o

Answer 1

This is how I handle it (using PreviewKeyDown), let's say we are looking for Alt + R...

private void OnPreviewKeyDown(object sender, KeyEventArgs e)
{
    if ((Keyboard.IsKeyDown(Key.LeftAlt) || Keyboard.IsKeyDown(Key.RightAlt)
       && e.SystemKey == Key.R)
    {
       //do whatever
    }
}

Maybe someone can clear up why I had to use e.SystemKey and not just e.Key, maybe due to the modifier? but this has worked flawlessly for me when searching for modifier+key.