Ctrl key press condition in WPF MouseLeftButtonDown event-handler

Question

How I can add additional condition of certain keyboard key, say, Ctrl-key state to WPF MouseLeftButtonDown event-handler?

private void Grid_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
    {         
     ...
    }

Answer 1

private void Grid_MouseLeftButtonDown(object sender, MouseButtonEventArgs e) {
        if(Keyboard.IsKeyDown(Key.LeftCtrl) || Keyboard.IsKeyDown(Key.RightCtrl)) {
            MessageBox.Show("Control key is down");
        } else {
            MessageBox.Show("Control key is up");
        }
    }

Answer 2

If you want to detect modifiers only, you can also use:

if (Keyboard.Modifiers == ModifierKeys.Control) {}
if (Keyboard.Modifiers == ModifierKeys.Shift) {}

etc. More here.