什么是更好的方式来响应数字按键？

Question

我想允许通过键盘检查单选按钮，特别是通过数字1,2,3。我已经得到了这个代码：

// "a WPF form hears what it wants to hear and disregards the rest" - paraphrased from "The Boxer" by Simon & Garfunkel
private void Window_PreviewKeyDown(object sender, System.Windows.Input.KeyEventArgs keArgs)
{
    var keyPressed = keArgs.Key.ToString();
    if ((keyPressed.Equals("D1")) || (keyPressed.Equals("NumPad1")))
    {
        rdbtnCandidateVal1.IsChecked = true;
    }
    else if ((keyPressed.Equals("D2")) || (keyPressed.Equals("NumPad2")))
    {
        rdbtnCandidateVal2.IsChecked = true;
    }
    else if ((keyPressed.Equals("D3")) || (keyPressed.Equals("NumPad3")))
    {
        rdbtnCandidateVal3.IsChecked = true;
    }
}

......但是知道这是kludgy'verbose。对一部分密钥采取行动并忽略其余部分的更好方法是什么？