Detect if Modifier Key is Pressed in KeyRoutedEven

问题:

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 ?

回答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.

回答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;

回答3:

You can try the following code

CoreVirtualKeyStates controlKeyState = Window.Current.CoreWindow.GetKeyState(VirtualKey.Control);
var  ctrl = (controlKeyState & CoreVirtualKeyStates.Down) == CoreVirtualKeyStates.Down;

CoreVirtualKeyStates shiftKeyState = Window.Current.CoreWindow.GetKeyState(VirtualKey.Shift);
var shift = (shiftKeyState & CoreVirtualKeyStates.Down) == CoreVirtualKeyStates.Down;

回答4:

Bitwise AND the Modifiers property of Keyboard with Shift Key -

bool isShiftKeyPressed = (Keyboard.Modifiers & ModifierKeys.Shift)
                         == ModifierKeys.Shift;

Try this too-

bool isShiftKeyPressed = (ModifierKeys & Keys.Shift) == Keys.Shift;

OR

Control.ModifierKeys == Keys.Shift