Detect if Modifier Key is Pressed in KeyRoutedEventArgs Event

Question

I have the following code:

public void tbSpeed_KeyDown(object sender, KeyRoutedEventArgs e)
{
    e.Handled = !((e.Key >= 48 && e.Key <= 57) || (e.Key >= 96 && e.Key <= 105) || (e.Key == 109) || (e.Key == 189));
}

Is there any way to detect if any modifier key like shift is being pressed ?

Answer 1

Use GetKeyState. e.g.

var state = CoreWindow.GetForCurrentThread().GetKeyState(VirtualKey.Shift);
return (state & CoreVirtualKeyStates.Down) == CoreVirtualKeyStates.Down;

Note: For Alt, you would use VirtualKey.Menu.

Answer 2

For Win10 UWP I noticed that the CTRL and SHIFT keys were set at Locked state. So I did the following:

var shiftState = CoreWindow.GetForCurrentThread().GetKeyState(VirtualKey.Shift);
var ctrlState = CoreWindow.GetForCurrentThread().GetKeyState(VirtualKey.Control);

var isShiftDown = shiftState != CoreVirtualKeyStates.None;
var isCtrlDown = ctrlState != CoreVirtualKeyStates.None;