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InkCanvas.DynamicRenderer set different custom DynamicRenderer multiple times, throw an exception

See original GitHub issue

Description

When using the touch screen, errors will occur, but not when using the mouse

On the touch screen, the two buttons switch and click multiple times to set a custom Dynamic Renderer for InkCanvas.DynamicRenderer. The crash always occurs after DrawPen OnRemoved

Button(DrawPen)、Button(DrawArrow)

`var dr = name switch {
“GeneralPen” => new DrawPen(this),
“ArrowPen” => new DrawArrow(this),
_ => new DrawPen(this), };

DynamicRenderer = dr; `

If set different custom DynamicRenderer multiple times, throw an exception

App_DispatcherUnhandledException--Object reference not set to an instance of an object. at System.Windows.Input.StylusPlugIns.DynamicRenderer.TransitionComplete(StrokeInfo si) at System.Windows.Input.StylusPlugIns.DynamicRenderer.<>c__DisplayClass19_0.<NotifyAppOfDRThreadRenderComplete>b__0(Object unused) at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs) at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)

PC-Test-develop-2.zip

Reproduction Steps

Ditto description

Expected behavior

No exception will be thrown

Actual behavior

Throw thread exception

Regression?

No response

Known Workarounds

No response

Impact

No response

Configuration

.NET Core Version: .NET 7.0.103 SDK Windows version: Version 22H2 (OS Build 19045.2546)

Other information

No response

Issue Analytics

State:
Created 7 months ago
Comments:7 (5 by maintainers)

Top GitHub Comments

3reactions

miloushcommented, Feb 15, 2023

Please provide a repro project having the issue.

1reaction

jaelyscommented, Feb 17, 2023

@lindexi Thank you for your help. I updated the Demo and annotated some code that may prevent exceptions. These codes are valid, but not 100%. Now we should be able to simply reproduce the exception. Just press the Pen Button several times, switch another button, and repeat it several times

感謝林德熙大神

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