How to detect modifier key states in WPF?

Question

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 */ }