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[Bug] CarouselView crashes on iOS with null DataTemplate's BindingContext #15776

Open aubiyko opened 1 year ago

aubiyko commented 1 year ago

Description

CarouselView crashes while scrolling on iOS with null DataTemplate's BindingContext.

Steps to Reproduce

  1. Use reproduction code.
  2. Scroll in forward direction

Expected Behavior

Everything works.

Actual Behavior

System.ArgumentNullException: Value cannot be null.
Parameter name: key
  at System.Collections.Generic.Dictionary`2[TKey,TValue].FindEntry (TKey key) [0x00008] in /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/src/Xamarin.iOS/external/corefx/src/Common/src/CoreLib/System/Collections/Generic/Dictionary.cs:380 
  at System.Collections.Generic.Dictionary`2[TKey,TValue].TryGetValue (TKey key, TValue& value) [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/src/Xamarin.iOS/external/corefx/src/Common/src/CoreLib/System/Collections/Generic/Dictionary.cs:888 
  at Xamarin.Forms.Platform.iOS.ItemsViewController`1[TItemsView].UpdateTemplatedCell (Xamarin.Forms.Platform.iOS.TemplatedCell cell, Foundation.NSIndexPath indexPath) [0x00031] in D:\a\1\s\Xamarin.Forms.Platform.iOS\CollectionView\ItemsViewController.cs:278 
  at Xamarin.Forms.Platform.iOS.CarouselViewController.GetCell (UIKit.UICollectionView collectionView, Foundation.NSIndexPath indexPath) [0x0006a] in D:\a\1\s\Xamarin.Forms.Platform.iOS\CollectionView\CarouselViewController.cs:47 
  at (wrapper managed-to-native) UIKit.UIApplication.xamarin_UIApplicationMain(int,intptr,intptr,intptr,intptr&)
  at UIKit.UIApplication.UIApplicationMain (System.Int32 argc, System.String[] argv, System.IntPtr principalClassName, System.IntPtr delegateClassName) [0x00008] in /Library/Frameworks/Xamarin.iOS.framework/Versions/16.4.0.6/src/Xamarin.iOS/UIKit/UIApplication.cs:58 
  at UIKit.UIApplication.Main (System.String[] args, System.Type principalClass, System.Type delegateClass) [0x0003b] in /Library/Frameworks/Xamarin.iOS.framework/Versions/16.4.0.6/src/Xamarin.iOS/UIKit/UIApplication.cs:94 
  at XFiOSCarouselDataTemplateRotationBug.iOS.Application.Main (System.String[] args) [0x00001] in C:\Users\user1\source\repos\XFiOSCarouselDataTemplateRotationBug\XFiOSCarouselDataTemplateRotationBug.iOS\Main.cs:9

Basic Information

Environment

Show/Hide Visual Studio info ``` Microsoft Visual Studio Community 2022 Version 17.6.4 VisualStudio.17.Release/17.6.4+33815.320 Microsoft .NET Framework Version 4.8.09037 Installed Version: Community Visual C++ 2022 00482-90000-00000-AA409 Microsoft Visual C++ 2022 ASP.NET and Web Tools 17.6.326.62524 ASP.NET and Web Tools Azure App Service Tools v3.0.0 17.6.326.62524 Azure App Service Tools v3.0.0 C# Tools 4.6.0-3.23259.8+c3cc1d0ceeab1a65da0217e403851a1e8a30086a C# components used in the IDE. Depending on your project type and settings, a different version of the compiler may be used. Common Azure Tools 1.10 Provides common services for use by Azure Mobile Services and Microsoft Azure Tools. Extensibility Message Bus 1.4.21 (main@8f226a8) Provides common messaging-based MEF services for loosely coupled Visual Studio extension components communication and integration. Microsoft JVM Debugger 1.0 Provides support for connecting the Visual Studio debugger to JDWP compatible Java Virtual Machines Mono Debugging for Visual Studio 17.6.41 (790a401) Support for debugging Mono processes with Visual Studio. NuGet Package Manager 6.6.0 NuGet Package Manager in Visual Studio. For more information about NuGet, visit https://docs.nuget.org/ Razor (ASP.NET Core) 17.6.0.2327201+a6a61fdfa748eaa65aab53dab583276e26af4a3e Provides languages services for ASP.NET Core Razor. SQL Server Data Tools 17.6.13.0 Microsoft SQL Server Data Tools SQL Server Reporting Services 16.0.20309.0 Microsoft SQL Server Reporting Services Designers Version 16.0.20309.0 Syntax Visualizer 1.0 An extension for visualizing Roslyn SyntaxTrees. TypeScript Tools 17.0.20329.2001 TypeScript Tools for Microsoft Visual Studio Visual Basic Tools 4.6.0-3.23259.8+c3cc1d0ceeab1a65da0217e403851a1e8a30086a Visual Basic components used in the IDE. Depending on your project type and settings, a different version of the compiler may be used. Visual F# Tools 17.6.0-beta.23174.5+0207bea1afae48d9351ac26fb51afc8260de0a97 Microsoft Visual F# Tools Visual Studio IntelliCode 2.2 AI-assisted development for Visual Studio. Visual Studio Spell Check Everywhere VSSpellCheckEverywhere An extension that enables spell checking within any Visual Studio file editor or tool window that uses WPF text boxes. https://GitHub.com/EWSoftware/VSSpellChecker Visual Studio Spell Checker VSSpellChecker An editor extension that checks the spelling of comments, strings, and plain text as you type or interactively with tool windows. https://GitHub.com/EWSoftware/VSSpellChecker VisualStudio.DeviceLog 1.0 Information about my package VisualStudio.Mac 1.0 Mac Extension for Visual Studio VSPackage Extension 1.0 VSPackage Visual Studio Extension Detailed Info Xamarin 17.6.0.251 (d17-6@318364c) Visual Studio extension to enable development for Xamarin.iOS and Xamarin.Android. Xamarin Designer 17.6.6.0 (remotes/origin/d17-6@cb430751d1) Visual Studio extension to enable Xamarin Designer tools in Visual Studio. Xamarin Templates 17.6.32 (98c12a2) Templates for building iOS, Android, and Windows apps with Xamarin and Xamarin.Forms. Xamarin.Android SDK 13.2.0.6 (d17-5/a200af1) Xamarin.Android Reference Assemblies and MSBuild support. Mono: 6dd9def Java.Interop: xamarin/java.interop/d17-5@149d70fe SQLite: xamarin/sqlite/3.40.1@68c69d8 Xamarin.Android Tools: xamarin/xamarin-android-tools/d17-5@9f02d77 Xamarin.iOS and Xamarin.Mac SDK 16.4.0.6 (97731c92c) Xamarin.iOS and Xamarin.Mac Reference Assemblies and MSBuild support. ```

Xcode 14.3.1 (14E300c)

Reproduction Link

MainPage.xaml ```xml 1 ```

Note: Orientation does not matter.