How can I find the state of NumLock, CapsLock and ScrollLock in .NET?

Question

How can I find the state of NumLock, CapsLock and ScrollLock keys in .NET?

Answer 1

If anyone comes across this thread while developing in WPF, you can use the Keyboard.IsToggled method that was introduced in .NET 3.0:

var isNumLockToggled = Keyboard.IsKeyToggled(Key.NumLock);
var isCapsLockToggled = Keyboard.IsKeyToggled(Key.CapsLock);
var isScrollLockToggled = Keyboard.IsKeyToggled(Key.Scroll);

You'll have to add the following using directive to the top of your class, if it's not already there:

using System.Windows.Input;

Internally, the IsToggled() method checks to see whether or not the KeyStates.Toggled flag is set for the specified key.

[Flags]
public enum KeyStates : byte
{
    None = (byte) 0,
    Down = (byte) 1,
    Toggled = (byte) 2,
}