为什么Keyboard.GetState（）无法检测到按下的键？

Question

KeyboardState oState = Keyboard.GetState();    
var oPressedKeys = oState.GetPressedKeys();

foreach (Keys oKey in oPressedKeys)
{
    Console.WriteLine(oKey.ToString());
}

if (oState.IsKeyDown(oQuit))
{
    return eReturnTypes.Terminate;
}

即使我捣毁键盘也不会写任何东西。