[Bug] Opening a content dialog with an expander with ExpanderCardStyleKey throws System.NullReferenceException

[Zaitonn]

Describe the bug

如题。

先在一个ContentDialog里头塞个Expander，然后给他的Style设置{StaticResource {x:Static ui:ThemeKeys.ExpanderCardStyleKey}}，然后show一下就抛异常了

Place an Expander inside a ContentDialog, then set its Style to {StaticResource {x:Static ui:ThemeKeys.ExpanderCardStyleKey}}, and a NullReferenceException is thrown when the dialog is shown.

堆栈信息 / Stack info

Unhandled exception. System.NullReferenceException: Object reference not set to an instance of an object.
   at iNKORE.UI.WPF.Modern.Controls.Helpers.ExpanderAnimationsHelper.UpdateLayout(FrameworkElement contentControl)
   at iNKORE.UI.WPF.Modern.Controls.Helpers.ExpanderAnimationsHelper.AnimateCollapse(Expander expander)
   at iNKORE.UI.WPF.Modern.Controls.Helpers.ExpanderAnimationsHelper.RunExpanderAnimation(Expander expander)    
   at iNKORE.UI.WPF.Modern.Controls.Helpers.ExpanderAnimationsHelper.<>c__DisplayClass12_0.<OnIsEnabledChanged>g__TriggerExpandAnimationOnLoad|0(Object sender, RoutedEventArgs routedEventArgs)
   at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)       
   at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
   at System.Windows.BroadcastEventHelper.BroadcastEvent(DependencyObject root, RoutedEvent routedEvent)        
   at System.Windows.BroadcastEventHelper.BroadcastLoadedEvent(Object root)
   at System.Windows.Media.MediaContext.FireLoadedPendingCallbacks()
   at System.Windows.Media.MediaContext.FireInvokeOnRenderCallbacks()
   at System.Windows.Media.MediaContext.RenderMessageHandlerCore(Object resizedCompositionTarget)
   at System.Windows.Media.MediaContext.RenderMessageHandler(Object resizedCompositionTarget)
   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)
   at System.Windows.Threading.DispatcherOperation.InvokeImpl()
   at MS.Internal.CulturePreservingExecutionContext.CallbackWrapper(Object obj)
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
--- End of stack trace from previous location ---
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
   at MS.Internal.CulturePreservingExecutionContext.Run(CulturePreservingExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Windows.Threading.DispatcherOperation.Invoke()
   at System.Windows.Threading.Dispatcher.ProcessQueue()
   at System.Windows.Threading.Dispatcher.WndProcHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   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)
   at System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
   at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
   at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)
   at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
   at System.Windows.Application.RunDispatcher(Object ignore)
   at System.Windows.Application.RunInternal(Window window)
   at Test.App.Main()

Reproduction

App.zip

just run the project and click the button in the center of the window

Suggested Solution

No response

Library Version

0.10.2

Operating System

Windows 11

Framework

.NET Core and .NET

Framework Version

8.0.22

Source of Package

NuGet.org (Package)

Additional Notes

UI.WPF.Modern/source/iNKORE.UI.WPF.Modern/Controls/Helpers/ExpanderAnimationsHelper.cs

Line 192 in be7b6a3

var toAnimateControl = GetToAnimateControl(expander);

感觉是这个的问题？🤔

Validations

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• You're sure there's something wrong with the library itself, not how you're using it. (If you are having issues using it and need help, please go to discussion.)

[mou-haz]

Hey @Zaitonn , can you see if #422 works for you ?

[Zaitonn]

@mou-haz yes, it works
thx :D

[mou-haz]

@mou-haz yes, it works
thx :D

Glad it worked! You are welcome.