[UWP] Using the navigation buttons on a mouse while the cursor is over a toucheffect control will throw a null reference exception

On UWP, you can have navigation buttons on your mouse. This means that while you press them, it’ll trigger the pressed events, which will navigate to a different page but also attempt to do things like animate the background color of the affected control. However, as the app has since navigated to a different page, the control it is trying to act upon no longer exists and a null reference exception is thrown at

TouchVisualManager.cs line 195

 new Animation{
                {0, 1,  new Animation(v => sender.Control.BackgroundColor = new Color(v, sender.Control.BackgroundColor.G, sender.Control.BackgroundColor.B, sender.Control.BackgroundColor.A), sender.Control.BackgroundColor.R, color.R) },
                {0, 1,  new Animation(v => sender.Control.BackgroundColor = new Color(sender.Control.BackgroundColor.R, v, sender.Control.BackgroundColor.B, sender.Control.BackgroundColor.A), sender.Control.BackgroundColor.G, color.G) },
                {0, 1,  new Animation(v => sender.Control.BackgroundColor = new Color(sender.Control.BackgroundColor.R, sender.Control.BackgroundColor.G, v, sender.Control.BackgroundColor.A), sender.Control.BackgroundColor.B, color.B) },
                {0, 1,  new Animation(v => sender.Control.BackgroundColor = new Color(sender.Control.BackgroundColor.R, sender.Control.BackgroundColor.G, sender.Control.BackgroundColor.B, v), sender.Control.BackgroundColor.A, color.A) },
            }.Commit(sender.Control, ChangeBackgroundColorAnimationName, 16, (uint)duration, easing, (d, b) => animationCompletionSource.SetResult(true));

sender.Control is null so it’ll fail.

[MitchBomcanhao]

Yes, first impression is that it is working fine 😉

[AndreiMisiukevich]

@MitchBomcanhao does it work?)