NullReferenceException with a platform-specific GestureRecognizer #24900

Jean-RobertLaffineur · 2024-09-24T12:55:28Z

Description

On Windows (didn't check the other platforms), a NullReferenceException occurs when adding a GestureRecognizer that is conditioned by an OnPlatform, such as no GestureRecognizer is defined in the current (Windows) platform:

<Border>
    <Border.GestureRecognizers>
        <OnPlatform x:TypeArguments="GestureRecognizer">
            <OnPlatform.Platforms>
                <On Platform="Android">
                    <TapGestureRecognizer Tapped="Header_Tapped" />
                </On>
                <!--<On Platform="WinUI">
                    <TapGestureRecognizer Tapped="Header_Tapped" />
                </On>-->
            </OnPlatform.Platforms>
        </OnPlatform>
    </Border.GestureRecognizers>
</Border>

Un-commenting the WinUI part above makes the NullReferenceException disappear.

Attached the complete reproduction project, which is basically a empty MAUI App project with the XAML definition from above.

GestureRecognizerCrash.zip

Steps to Reproduce

Open the attached project
Build and run the project in Windows

Result: crash with a NullReferenceException

Link to public reproduction project repository

No response

Version with bug

8.0.70 SR7

Is this a regression from previous behavior?

Yes, this used to work in .NET MAUI

Last version that worked well

8.0.61 SR6.1

Affected platforms

Windows

Affected platform versions

Windows 10.0.19041.0

Did you find any workaround?

Un-commenting the lines in the XAML extract above fixes the crash.

Downgrading both dependencies (maybe one is enough?) below from version 8.0.70 to version 8.0.61 also fix the crash:

Microsoft.Maui.Controls
Microsoft.Maui.Controls.Compatibility

Relevant log output

Microsoft.Maui.Controls.dll!Microsoft.Maui.Controls.View..ctor.__AddItems|15_1(System.Collections.IList newItems)	Unknown
 	Microsoft.Maui.Controls.dll!Microsoft.Maui.Controls.View..ctor.AnonymousMethod__15_0(object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs args)	Unknown
>	System.ObjectModel.dll!System.Collections.ObjectModel.ObservableCollection<Microsoft.Maui.Controls.IGestureRecognizer>.OnCollectionChanged(System.Collections.Specialized.NotifyCollectionChangedEventArgs e) Line 192	C#
 	[Native to Managed Transition]	
 	[Managed to Native Transition]	
 	System.Private.CoreLib.dll!System.Reflection.MethodBaseInvoker.InvokeDirectByRefWithFewArgs(object obj, System.Span<object> copyOfArgs, System.Reflection.BindingFlags invokeAttr) Line 178	C#
 	System.Private.CoreLib.dll!System.Reflection.MethodBaseInvoker.InvokeWithOneArg(object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, object[] parameters, System.Globalization.CultureInfo culture) Line 104	C#
 	Microsoft.Maui.Controls.Xaml.dll!Microsoft.Maui.Controls.Xaml.ApplyPropertiesVisitor.TryAddToProperty(object element, Microsoft.Maui.Controls.Xaml.XmlName propertyName, object value, string xKey, System.Xml.IXmlLineInfo lineInfo, System.IServiceProvider serviceProvider, object rootElement, out System.Exception exception)	Unknown
 	Microsoft.Maui.Controls.Xaml.dll!Microsoft.Maui.Controls.Xaml.ApplyPropertiesVisitor.TrySetPropertyValue(object element, Microsoft.Maui.Controls.Xaml.XmlName propertyName, string xKey, object value, object rootElement, System.Xml.IXmlLineInfo lineInfo, System.IServiceProvider serviceProvider, out System.Exception xpe)	Unknown
 	Microsoft.Maui.Controls.Xaml.dll!Microsoft.Maui.Controls.Xaml.ApplyPropertiesVisitor.SetPropertyValue(object xamlelement, Microsoft.Maui.Controls.Xaml.XmlName propertyName, object value, object rootElement, Microsoft.Maui.Controls.Xaml.INode node, Microsoft.Maui.Controls.Xaml.HydrationContext context, System.Xml.IXmlLineInfo lineInfo)	Unknown
 	Microsoft.Maui.Controls.Xaml.dll!Microsoft.Maui.Controls.Xaml.ApplyPropertiesVisitor.Visit(Microsoft.Maui.Controls.Xaml.ElementNode node, Microsoft.Maui.Controls.Xaml.INode parentNode)	Unknown
 	Microsoft.Maui.Controls.Xaml.dll!Microsoft.Maui.Controls.Xaml.ElementNode.Accept(Microsoft.Maui.Controls.Xaml.IXamlNodeVisitor visitor, Microsoft.Maui.Controls.Xaml.INode parentNode)	Unknown
 	Microsoft.Maui.Controls.Xaml.dll!Microsoft.Maui.Controls.Xaml.ElementNode.Accept(Microsoft.Maui.Controls.Xaml.IXamlNodeVisitor visitor, Microsoft.Maui.Controls.Xaml.INode parentNode)	Unknown
 	Microsoft.Maui.Controls.Xaml.dll!Microsoft.Maui.Controls.Xaml.RootNode.Accept(Microsoft.Maui.Controls.Xaml.IXamlNodeVisitor visitor, Microsoft.Maui.Controls.Xaml.INode parentNode)	Unknown
 	Microsoft.Maui.Controls.Xaml.dll!Microsoft.Maui.Controls.Xaml.XamlLoader.Visit(Microsoft.Maui.Controls.Xaml.RootNode rootnode, Microsoft.Maui.Controls.Xaml.HydrationContext visitorContext, bool useDesignProperties)	Unknown
 	Microsoft.Maui.Controls.Xaml.dll!Microsoft.Maui.Controls.Xaml.XamlLoader.Load(object view, string xaml, System.Reflection.Assembly rootAssembly, bool useDesignProperties)	Unknown
 	Microsoft.Maui.Controls.Xaml.dll!Microsoft.Maui.Controls.Xaml.XamlLoader.Load(object view, string xaml, bool useDesignProperties)	Unknown
 	Microsoft.Maui.Controls.Xaml.dll!Microsoft.Maui.Controls.Xaml.XamlLoader.Load(object view, System.Type callingType)	Unknown
 	Microsoft.Maui.Controls.Xaml.dll!Microsoft.Maui.Controls.Xaml.Extensions.LoadFromXaml<GestureRecognizerCrash.MainPage>(GestureRecognizerCrash.MainPage view, System.Type callingType)	Unknown
 	GestureRecognizerCrash.dll!GestureRecognizerCrash.MainPage.InitializeComponent() Line 22	C#
 	GestureRecognizerCrash.dll!GestureRecognizerCrash.MainPage.MainPage() Line 9	C#
 	Microsoft.Maui.Controls.dll!Microsoft.Maui.Controls.ShellContent.Microsoft.Maui.Controls.IShellContentController.GetOrCreateContent.AnonymousMethod__0()	Unknown
 	Microsoft.Maui.Controls.dll!Microsoft.Maui.Controls.ElementTemplate.CreateContent()	Unknown
 	Microsoft.Maui.Controls.dll!Microsoft.Maui.Controls.Internals.DataTemplateExtensions.CreateContent(Microsoft.Maui.Controls.DataTemplate self, object item, Microsoft.Maui.Controls.BindableObject container)	Unknown
 	Microsoft.Maui.Controls.dll!Microsoft.Maui.Controls.ShellContent.Microsoft.Maui.Controls.IShellContentController.GetOrCreateContent()	Unknown
 	Microsoft.Maui.Controls.dll!Microsoft.Maui.Controls.Handlers.ShellContentHandler.CreatePlatformElement()	Unknown
 	Microsoft.Maui.dll!Microsoft.Maui.Handlers.ElementHandler<System.__Canon, System.__Canon>.OnCreatePlatformElement()	Unknown
 	Microsoft.Maui.dll!Microsoft.Maui.Handlers.ElementHandler.CreatePlatformElement()	Unknown
 	Microsoft.Maui.dll!Microsoft.Maui.Handlers.ElementHandler.SetVirtualView(Microsoft.Maui.IElement view)	Unknown
 	Microsoft.Maui.Controls.dll!Microsoft.Maui.Controls.Element.SetHandler(Microsoft.Maui.IElementHandler newHandler)	Unknown
 	Microsoft.Maui.Controls.dll!Microsoft.Maui.Controls.Element.Handler.set(Microsoft.Maui.IElementHandler value)	Unknown
 	Microsoft.Maui.dll!Microsoft.Maui.Platform.ElementExtensions.ToHandler(Microsoft.Maui.IElement view, Microsoft.Maui.IMauiContext context)	Unknown
 	Microsoft.Maui.dll!Microsoft.Maui.Platform.ElementExtensions.ToPlatform(Microsoft.Maui.IElement view, Microsoft.Maui.IMauiContext context)	Unknown
 	Microsoft.Maui.Controls.dll!Microsoft.Maui.Controls.Handlers.ShellSectionHandler.SyncNavigationStack(bool animated, Microsoft.Maui.Controls.Internals.NavigationRequestedEventArgs e)	Unknown
 	Microsoft.Maui.Controls.dll!Microsoft.Maui.Controls.Handlers.ShellSectionHandler.MapCurrentItem(Microsoft.Maui.Controls.Handlers.ShellSectionHandler handler, Microsoft.Maui.Controls.ShellSection item)	Unknown
 	Microsoft.Maui.dll!Microsoft.Maui.PropertyMapper<Microsoft.Maui.Controls.ShellSection, Microsoft.Maui.Controls.Handlers.ShellSectionHandler>.Add.AnonymousMethod__0(Microsoft.Maui.IElementHandler h, Microsoft.Maui.IElement v)	Unknown
 	Microsoft.Maui.dll!Microsoft.Maui.PropertyMapper.UpdatePropertyCore(string key, Microsoft.Maui.IElementHandler viewHandler, Microsoft.Maui.IElement virtualView)	Unknown
 	Microsoft.Maui.dll!Microsoft.Maui.PropertyMapper.UpdateProperties(Microsoft.Maui.IElementHandler viewHandler, Microsoft.Maui.IElement virtualView)	Unknown
 	Microsoft.Maui.dll!Microsoft.Maui.Handlers.ElementHandler.SetVirtualView(Microsoft.Maui.IElement view)	Unknown
 	Microsoft.Maui.Controls.dll!Microsoft.Maui.Controls.Handlers.ShellSectionHandler.SetVirtualView(Microsoft.Maui.IElement view)	Unknown
 	Microsoft.Maui.Controls.dll!Microsoft.Maui.Controls.Element.SetHandler(Microsoft.Maui.IElementHandler newHandler)	Unknown
 	Microsoft.Maui.Controls.dll!Microsoft.Maui.Controls.Element.Handler.set(Microsoft.Maui.IElementHandler value)	Unknown
 	Microsoft.Maui.dll!Microsoft.Maui.Platform.ElementExtensions.ToHandler(Microsoft.Maui.IElement view, Microsoft.Maui.IMauiContext context)	Unknown
 	Microsoft.Maui.Controls.dll!Microsoft.Maui.Controls.Handlers.ShellItemHandler.UpdateCurrentItem()	Unknown
 	Microsoft.Maui.Controls.dll!Microsoft.Maui.Controls.Handlers.ShellItemHandler.MapCurrentItem(Microsoft.Maui.Controls.Handlers.ShellItemHandler handler, Microsoft.Maui.Controls.ShellItem item)	Unknown
 	Microsoft.Maui.dll!Microsoft.Maui.PropertyMapper<Microsoft.Maui.Controls.ShellItem, Microsoft.Maui.Controls.Handlers.ShellItemHandler>.Add.AnonymousMethod__0(Microsoft.Maui.IElementHandler h, Microsoft.Maui.IElement v)	Unknown
 	Microsoft.Maui.dll!Microsoft.Maui.PropertyMapper.UpdatePropertyCore(string key, Microsoft.Maui.IElementHandler viewHandler, Microsoft.Maui.IElement virtualView)	Unknown
 	Microsoft.Maui.dll!Microsoft.Maui.PropertyMapper.UpdateProperties(Microsoft.Maui.IElementHandler viewHandler, Microsoft.Maui.IElement virtualView)	Unknown
 	Microsoft.Maui.dll!Microsoft.Maui.Handlers.ElementHandler.SetVirtualView(Microsoft.Maui.IElement view)	Unknown
 	Microsoft.Maui.Controls.dll!Microsoft.Maui.Controls.Handlers.ShellItemHandler.SetVirtualView(Microsoft.Maui.IElement view)	Unknown
 	Microsoft.Maui.Controls.dll!Microsoft.Maui.Controls.Element.SetHandler(Microsoft.Maui.IElementHandler newHandler)	Unknown
 	Microsoft.Maui.Controls.dll!Microsoft.Maui.Controls.Element.Handler.set(Microsoft.Maui.IElementHandler value)	Unknown
 	Microsoft.Maui.dll!Microsoft.Maui.Platform.ElementExtensions.ToHandler(Microsoft.Maui.IElement view, Microsoft.Maui.IMauiContext context)	Unknown
 	Microsoft.Maui.Controls.dll!Microsoft.Maui.Controls.Platform.ShellView.CreateShellItemView()	Unknown
 	Microsoft.Maui.Controls.dll!Microsoft.Maui.Controls.Platform.ShellView.SwitchShellItem(Microsoft.Maui.Controls.ShellItem newItem, bool animate)	Unknown
 	Microsoft.Maui.Controls.dll!Microsoft.Maui.Controls.Handlers.ShellHandler.MapCurrentItem(Microsoft.Maui.Controls.Handlers.ShellHandler handler, Microsoft.Maui.Controls.Shell view)	Unknown
 	Microsoft.Maui.dll!Microsoft.Maui.PropertyMapper<Microsoft.Maui.Controls.Shell, Microsoft.Maui.Controls.Handlers.ShellHandler>.Add.AnonymousMethod__0(Microsoft.Maui.IElementHandler h, Microsoft.Maui.IElement v)	Unknown
 	Microsoft.Maui.dll!Microsoft.Maui.PropertyMapper.UpdatePropertyCore(string key, Microsoft.Maui.IElementHandler viewHandler, Microsoft.Maui.IElement virtualView)	Unknown
 	Microsoft.Maui.dll!Microsoft.Maui.PropertyMapper.UpdateProperties(Microsoft.Maui.IElementHandler viewHandler, Microsoft.Maui.IElement virtualView)	Unknown
 	Microsoft.Maui.dll!Microsoft.Maui.Handlers.ElementHandler.SetVirtualView(Microsoft.Maui.IElement view)	Unknown
 	Microsoft.Maui.dll!Microsoft.Maui.Handlers.ViewHandler<System.__Canon, System.__Canon>.SetVirtualView(Microsoft.Maui.IView view)	Unknown
 	Microsoft.Maui.Controls.dll!Microsoft.Maui.Controls.Handlers.ShellHandler.SetVirtualView(Microsoft.Maui.IView view)	Unknown
 	Microsoft.Maui.dll!Microsoft.Maui.Handlers.ViewHandler<System.__Canon, System.__Canon>.SetVirtualView(Microsoft.Maui.IElement view)	Unknown
 	Microsoft.Maui.Controls.dll!Microsoft.Maui.Controls.Element.SetHandler(Microsoft.Maui.IElementHandler newHandler)	Unknown
 	Microsoft.Maui.Controls.dll!Microsoft.Maui.Controls.Element.Handler.set(Microsoft.Maui.IElementHandler value)	Unknown
 	Microsoft.Maui.Controls.dll!Microsoft.Maui.Controls.VisualElement.Microsoft.Maui.IElement.Handler.set(Microsoft.Maui.IElementHandler value)	Unknown
 	Microsoft.Maui.dll!Microsoft.Maui.Platform.ElementExtensions.ToHandler(Microsoft.Maui.IElement view, Microsoft.Maui.IMauiContext context)	Unknown
 	Microsoft.Maui.dll!Microsoft.Maui.Platform.ElementExtensions.ToPlatform(Microsoft.Maui.IElement view, Microsoft.Maui.IMauiContext context)	Unknown
 	Microsoft.Maui.dll!Microsoft.Maui.Handlers.WindowHandler.MapContent(Microsoft.Maui.Handlers.IWindowHandler handler, Microsoft.Maui.IWindow window)	Unknown
 	Microsoft.Maui.dll!Microsoft.Maui.PropertyMapper<Microsoft.Maui.IWindow, Microsoft.Maui.Handlers.IWindowHandler>.Add.AnonymousMethod__0(Microsoft.Maui.IElementHandler h, Microsoft.Maui.IElement v)	Unknown
 	Microsoft.Maui.dll!Microsoft.Maui.PropertyMapper.UpdatePropertyCore(string key, Microsoft.Maui.IElementHandler viewHandler, Microsoft.Maui.IElement virtualView)	Unknown
 	Microsoft.Maui.dll!Microsoft.Maui.PropertyMapper.UpdateProperties(Microsoft.Maui.IElementHandler viewHandler, Microsoft.Maui.IElement virtualView)	Unknown
 	Microsoft.Maui.dll!Microsoft.Maui.Handlers.ElementHandler.SetVirtualView(Microsoft.Maui.IElement view)	Unknown
 	Microsoft.Maui.Controls.dll!Microsoft.Maui.Controls.Element.SetHandler(Microsoft.Maui.IElementHandler newHandler)	Unknown
 	Microsoft.Maui.Controls.dll!Microsoft.Maui.Controls.Element.Handler.set(Microsoft.Maui.IElementHandler value)	Unknown
 	Microsoft.Maui.dll!Microsoft.Maui.Platform.ElementExtensions.SetHandler(WinRT.IWinRTObject nativeElement, Microsoft.Maui.IElement element, Microsoft.Maui.IMauiContext context)	Unknown
 	Microsoft.Maui.dll!Microsoft.Maui.Platform.ElementExtensions.SetWindowHandler(Microsoft.UI.Xaml.Window platformWindow, Microsoft.Maui.IWindow window, Microsoft.Maui.IMauiContext context)	Unknown
 	Microsoft.Maui.dll!Microsoft.Maui.Platform.ApplicationExtensions.CreatePlatformWindow(Microsoft.UI.Xaml.Application platformApplication, Microsoft.Maui.IApplication application, Microsoft.Maui.Handlers.OpenWindowRequest args)	Unknown
 	Microsoft.Maui.dll!Microsoft.Maui.Platform.ApplicationExtensions.CreatePlatformWindow(Microsoft.UI.Xaml.Application platformApplication, Microsoft.Maui.IApplication application, Microsoft.UI.Xaml.LaunchActivatedEventArgs args)	Unknown
 	Microsoft.Maui.dll!Microsoft.Maui.MauiWinUIApplication.OnLaunched(Microsoft.UI.Xaml.LaunchActivatedEventArgs args)	Unknown
 	Microsoft.WinUI.dll!Microsoft.UI.Xaml.Application.Microsoft.UI.Xaml.IApplicationOverrides.OnLaunched(Microsoft.UI.Xaml.LaunchActivatedEventArgs args) Line 387	C#
 	Microsoft.WinUI.dll!ABI.Microsoft.UI.Xaml.IApplicationOverrides.Do_Abi_OnLaunched_0(nint thisPtr, nint args) Line 13722	C#
 	[Native to Managed Transition]	
 	[Managed to Native Transition]	
 	Microsoft.WinUI.dll!ABI.Microsoft.UI.Xaml.IApplicationStaticsMethods.Start(WinRT.IObjectReference _obj, Microsoft.UI.Xaml.ApplicationInitializationCallback callback) Line 13745	C#
 	Microsoft.WinUI.dll!Microsoft.UI.Xaml.Application.Start(Microsoft.UI.Xaml.ApplicationInitializationCallback callback) Line 320	C#
 	GestureRecognizerCrash.dll!GestureRecognizerCrash.WinUI.Program.Main(string[] args) Line 32	C#

The text was updated successfully, but these errors were encountered:

github-actions · 2024-09-24T12:55:59Z

Hi I'm an AI powered bot that finds similar issues based off the issue title.

Please view the issues below to see if they solve your problem, and if the issue describes your problem please consider closing this one and thumbs upping the other issue to help us prioritize it. Thank you!

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jfversluis · 2024-09-24T19:26:11Z

Would you also be able to test with the latest available .NET MAUI version? 8.0.90, small chance, but maybe we fixed it there already?

CathyZhu0110 · 2024-09-25T10:51:38Z

This issue has been verified and can repro using Visual Studio 17.12.0 Preview 2.0(8.0.90 & 8.0.70), but not repro on 8.0.61.

StephaneDelcroix · 2024-09-30T06:50:20Z

there's no default, hence the null ref. but it should no-op, and not fail. Does this happens on release builds as well ?

StephaneDelcroix · 2024-09-30T13:21:15Z

I can confirm this. it fails on both Debug ans Release

- fixes #24900

- fixes #24900 Co-authored-by: Stephane Delcroix <[email protected]>

- fixes #24900

Jean-RobertLaffineur added the t/bug Something isn't working label Sep 24, 2024

jfversluis added area-gestures Gesture types potential-regression This issue described a possible regression on a currently supported version., verification pending labels Sep 24, 2024

PureWeen added this to the .NET 8 SR9 milestone Sep 25, 2024

PureWeen added this to MAUI SDK Ongoing Sep 25, 2024

github-project-automation bot moved this to Todo in MAUI SDK Ongoing Sep 25, 2024

StephaneDelcroix self-assigned this Sep 30, 2024

StephaneDelcroix added a commit that referenced this issue Sep 30, 2024

[C] avoid NRE on null GesturRecognizer

3e5b68b

- fixes #24900

StephaneDelcroix mentioned this issue Sep 30, 2024

[C] avoid NRE on null GestureRecognizer #25008

Merged

StephaneDelcroix added a commit that referenced this issue Sep 30, 2024

[C] avoid NRE on null GesturRecognizer

069e2d1

- fixes #24900

jfversluis closed this as completed in #25008 Sep 30, 2024

jfversluis closed this as completed in efa6b97 Sep 30, 2024

github-project-automation bot moved this from Todo to Done in MAUI SDK Ongoing Sep 30, 2024

PureWeen modified the milestones: .NET 8 SR9, .NET 8 SR9.2 Oct 1, 2024

github-actions bot pushed a commit that referenced this issue Oct 1, 2024

[C] avoid NRE on null GesturRecognizer

4dcd338

- fixes #24900

rmarinho pushed a commit that referenced this issue Oct 1, 2024

[C] avoid NRE on null GesturRecognizer (#25029)

b2ab38e

- fixes #24900 Co-authored-by: Stephane Delcroix <[email protected]>

rmarinho pushed a commit that referenced this issue Oct 16, 2024

[C] avoid NRE on null GesturRecognizer (#25008)

fbea02f

- fixes #24900

rmarinho pushed a commit that referenced this issue Oct 16, 2024

[C] avoid NRE on null GesturRecognizer (#25008)

4f6c77c

- fixes #24900

samhouts added the fixed-in-8.0.92 label Oct 18, 2024

github-actions bot locked and limited conversation to collaborators Nov 18, 2024

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NullReferenceException with a platform-specific GestureRecognizer #24900

NullReferenceException with a platform-specific GestureRecognizer #24900

Jean-RobertLaffineur commented Sep 24, 2024

github-actions bot commented Sep 24, 2024

jfversluis commented Sep 24, 2024

CathyZhu0110 commented Sep 25, 2024 •

edited

Loading

StephaneDelcroix commented Sep 30, 2024

StephaneDelcroix commented Sep 30, 2024

NullReferenceException with a platform-specific GestureRecognizer #24900

NullReferenceException with a platform-specific GestureRecognizer #24900

Comments

Jean-RobertLaffineur commented Sep 24, 2024

Description

Steps to Reproduce

Link to public reproduction project repository

Version with bug

Is this a regression from previous behavior?

Last version that worked well

Affected platforms

Affected platform versions

Did you find any workaround?

Relevant log output

github-actions bot commented Sep 24, 2024

Open similar issues:

Closed similar issues:

jfversluis commented Sep 24, 2024

CathyZhu0110 commented Sep 25, 2024 • edited Loading

StephaneDelcroix commented Sep 30, 2024

StephaneDelcroix commented Sep 30, 2024

CathyZhu0110 commented Sep 25, 2024 •

edited

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