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

Partly borrowing from @Josh, and somewhat similar to @Krushik, and also referencing a question about the Difference between KeyEventArgs.systemKey and KeyEventArgs.Key (answering why Josh has to use SystemKey); wherein, with modifier keys (such as Alt), e.Key returns Key.System, and thus the 'real' key is within e.SystemKey.

A way around this, is to first fetch the 'real' key, and then do your conditional:

private void OnPreviewKeyDown(object sender, KeyEventArgs e)
{
    // Fetch the real key.
    var key = e.Key == Key.System ? e.SystemKey : e.Key;

    if ((Keyboard.IsKeyDown(Key.LeftAlt) || Keyboard.IsKeyDown(Key.RightAlt))
        && key == Key.Return)
    {
        // Execute your code.
    }
}