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Heather [layout designer]
XNA
Keyboard Component
This component processes keyboard input. It is not currently a GameComponent, but it can easily be adapted to be one. call KeyboardHelper.Update() in the main game loops before everything else. Also, thanks to Shawn Hargreaves, I have removed a bug where the Keys would get boxed each time they were accessed or added to the dictionary, which resulted in several thousand new objects every second. NOTE: I haven't manually added in all the keys yet. If you wish to use a specific key, add it in the component's Update() method.

Here's how to register the events to use the component:

KeyboardHelper.OnKeyDown += new KeyboardHelper.KeyEventHandler(KeyboardHelper_OnKeyDown);
KeyboardHelper.OnKeyPressed += new KeyboardHelper.KeyEventHandler(KeyboardHelper_OnKeyPressed);
KeyboardHelper.OnKeyUp += new KeyboardHelper.KeyEventHandler(KeyboardHelper_OnKeyUp);

And here is the actual component:

class KeyboardHelper
{
    public delegate void KeyEventHandler(Keys key);
    public static event KeyEventHandler OnKeyPressed;
    public static event KeyEventHandler OnKeyDown;
    public static event KeyEventHandler OnKeyUp;

    static Dictionary<int, bool> keyStates = new Dictionary<int, bool>();

    public static void Update()
    {
        KeyHelper(Keys.Up);
        KeyHelper(Keys.Down);
        KeyHelper(Keys.Left);
        KeyHelper(Keys.Right);
        KeyHelper(Keys.Escape);
        KeyHelper(Keys.Enter);
        KeyHelper(Keys.LeftControl);
        KeyHelper(Keys.Space);

        KeyHelper(Keys.W);
        KeyHelper(Keys.A);
        KeyHelper(Keys.S);
        KeyHelper(Keys.D);
        KeyHelper(Keys.Q);
        KeyHelper(Keys.P);
    }

    static void KeyHelper(Keys key)
    {
        if (!keyStates.ContainsKey((int)key))
            keyStates.Add((int)key, false);
        if (Keyboard.GetState()[key] == KeyState.Down)
        {
            if (!keyStates[(int)key])
                if(OnKeyDown!=null)
                    OnKeyDown(key);
            keyStates[(int)key] = true;
        }
        else
        {
            if (keyStates[(int)key])
                if (OnKeyPressed != null)
                    OnKeyPressed(key);
            if (OnKeyUp != null)
                OnKeyUp(key);
            keyStates[(int)key] = false;
        }
    }
}

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