How to detect modifier key states in WPF?
Use class Keyboard. Using Keyboard.IsKeyDown you can check if Control, Shift, Alt is down now.
For Shift:
if (Keyboard.IsKeyDown(Key.LeftShift) || Keyboard.IsKeyDown(Key.RightShift)){ /* Your code */ }For Control:
if (Keyboard.IsKeyDown(Key.LeftCtrl) || Keyboard.IsKeyDown(Key.RightCtrl)){ /* Your code */ }For Alt:
if (Keyboard.IsKeyDown(Key.LeftAlt) || Keyboard.IsKeyDown(Key.RightAlt)){ /* Your code */ }
private bool IsShiftKey { get; set; } private void OnPreviewKeyDown(object sender, KeyEventArgs e) { IsShiftKey = Keyboard.Modifiers == ModifierKeys.Shift ? true : false; if ((Key.Oem3 == e.Key || ((IsShiftKey && Key.Oem4 == e.Key) || (IsShiftKey && Key.Oem6 == e.Key) || (IsShiftKey && Key.Oem5 == e.Key)) && (validatorDefn as FormatValidatorDefinition).format == "packedascii")) { e.Handled = true; } }