当滑块聚焦时，KeyDown事件不起作用（C＃UWP）

Question

I am trying to make the focus change away from a slider when the up arrow on the keyboard is pressed. The problem is that the up arrow just increases the value of the slider instead of performing the KeyDown event. Please help, and here is my code if needed:

private void slider1_KeyDown(object sender, KeyRoutedEventArgs e)
    {
        if ((e.Key == VirtualKey.Up))
        {
            customvolumebutton.Focus(FocusState.Keyboard);
            label1.Text = "focus changed";
        }
    }

Answer 1

By default, the Up and Down keys control the Value of the Slider . If you want your own behavioir, you can manually handle the routed event by calling AddHandler in your page's constructor

slider1.AddHandler(KeyDownEvent, new KeyEventHandler(slider1_KeyDown), true);

So just remove your current KeyDown subscription as it's no longer needed. And what's inside your slider1_KeyDown should now be invoked by any key press.