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[Bug] Shell.Current.GoToAsync method fails #15096

Open LeonSweden opened 2 years ago

LeonSweden commented 2 years ago

Description

When calling Shell.Current.GoToAsync with route defined in AppShell, it fails with expception

Steps to Reproduce

  1. Define route in AppShell
  2. Call Shell.Current.GoToAsync method

Expected Behavior

Loaded routed page

Actual Behavior

Exception: {System.ArgumentNullException: Shell Content Page is Null Parameter name: page at Xamarin.Forms.Platform.Android.ShellSectionRenderer.UpdateCurrentItem (Xamarin.Forms.ShellContent content) [0x00013] in D:\a\1\s\Xamarin.Forms.Platform.Android\Renderers\ShellSectionRenderer.cs:83 at Xamarin.Forms.Platform.Android.ShellSectionRenderer.AndroidX.ViewPager.Widget.ViewPager.IOnPageChangeListener.OnPageScrolled (System.Int32 position, System.Single positionOffset, System.Int32 positionOffsetPixels) [0x0001c] in D:\a\1\s\Xamarin.Forms.Platform.Android\Renderers\ShellSectionRenderer.cs:26 at AndroidX.ViewPager.Widget.ViewPager+IOnPageChangeListenerInvoker.n_OnPageScrolled_IFI (System.IntPtr jnienv, System.IntPtr native__this, System.Int32 position, System.Single positionOffset, System.Int32 positionOffsetPixels) [0x00008] in D:\a\1\s\generated\androidx.viewpager.viewpager\obj\Release\monoandroid9.0\generated\src\AndroidX.ViewPager.Widget.ViewPager.cs:563 at (wrapper dynamic-method) Android.Runtime.DynamicMethodNameCounter.93(intptr,intptr,int,single,int)}

Basic Information

Environment

Show/Hide Visual Studio info ``` Microsoft Visual Studio Community 2022 Version 17.0.5 VisualStudio.17.Release/17.0.5+32112.339 Microsoft .NET Framework Version 4.8.04161 Installed Version: Community Visual C++ 2022 00482-90000-00000-AA164 Microsoft Visual C++ 2022 .NET Core Debugging with WSL 1.0 .NET Core Debugging with WSL ADL Tools Service Provider 1.0 This package contains services used by Data Lake tools ASA Service Provider 1.0 ASP.NET and Web Tools 2019 17.0.795.42246 ASP.NET and Web Tools 2019 ASP.NET Web Frameworks and Tools 2019 17.0.795.42246 For additional information, visit https://www.asp.net/ Azure App Service Tools v3.0.0 17.0.795.42246 Azure App Service Tools v3.0.0 Azure Data Lake Tools for Visual Studio 2.6.4000.0 Microsoft Azure Data Lake Tools for Visual Studio Azure Functions and Web Jobs Tools 17.0.795.42246 Azure Functions and Web Jobs Tools Azure Stream Analytics Tools for Visual Studio 2.6.4000.0 Microsoft Azure Stream Analytics Tools for Visual Studio C# Tools 4.0.1-1.21568.1+6ab6601178d9fba8c680b56934cd1742e0816bff 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. Cookiecutter 17.0.21293.2 Provides tools for finding, instantiating and customizing templates in cookiecutter format. DeployToGae Extension 1.0 DeployToGae Visual Studio Extension Detailed Info Extensibility Message Bus 1.2.6 (master@34d6af2) Provides common messaging-based MEF services for loosely coupled Visual Studio extension components communication and integration. Fabric.DiagnosticEvents 1.0 Fabric Diagnostic Events Microsoft Azure Hive Query Language Service 2.6.4000.0 Language service for Hive query Microsoft Azure Service Fabric Tools for Visual Studio 17.0 Microsoft Azure Service Fabric Tools for Visual Studio Microsoft Azure Stream Analytics Language Service 2.6.4000.0 Language service for Azure Stream Analytics Microsoft Azure Tools for Visual Studio 2.9 Support for Azure Cloud Services projects Microsoft JVM Debugger 1.0 Provides support for connecting the Visual Studio debugger to JDWP compatible Java Virtual Machines Microsoft Library Manager 2.1.134+45632ee938.RR Install client-side libraries easily to any web project Microsoft MI-Based Debugger 1.0 Provides support for connecting Visual Studio to MI compatible debuggers Microsoft Visual C++ Wizards 1.0 Microsoft Visual C++ Wizards Microsoft Visual Studio Tools for Containers 1.2 Develop, run, validate your ASP.NET Core applications in the target environment. F5 your application directly into a container with debugging, or CTRL + F5 to edit & refresh your app without having to rebuild the container. Microsoft Visual Studio VC Package 1.0 Microsoft Visual Studio VC Package Mono Debugging for Visual Studio 17.0.11 (54f19d2) Support for debugging Mono processes with Visual Studio. NuGet Package Manager 6.0.1 NuGet Package Manager in Visual Studio. For more information about NuGet, visit https://docs.nuget.org/ ProjectServicesPackage Extension 1.0 ProjectServicesPackage Visual Studio Extension Detailed Info Python - Profiling support 17.0.21293.2 Profiling support for Python projects. Python with Pylance 17.0.21293.2 Provides IntelliSense, projects, templates, debugging, interactive windows, and other support for Python developers. Razor (ASP.NET Core) 17.0.0.2156603+e9cd763349a080127b6519ffbec0123949a4c385 Provides languages services for ASP.NET Core Razor. SQL Server Data Tools 17.0.62110.20190 Microsoft SQL Server Data Tools SyncfusionXamarinMenu Extension 1.0 SyncfusionXamarinMenu Visual Studio Extension Detailed Info Test Adapter for Boost.Test 1.0 Enables Visual Studio's testing tools with unit tests written for Boost.Test. The use terms and Third Party Notices are available in the extension installation directory. Test Adapter for Google Test 1.0 Enables Visual Studio's testing tools with unit tests written for Google Test. The use terms and Third Party Notices are available in the extension installation directory. ToolWindowHostedEditor 1.0 Hosting json editor into a tool window TypeScript Tools 17.0.1001.2002 TypeScript Tools for Microsoft Visual Studio Visual Basic Tools 4.0.1-1.21568.1+6ab6601178d9fba8c680b56934cd1742e0816bff Visual Basic components used in the IDE. Depending on your project type and settings, a different version of the compiler may be used. Visual C++ for Cross Platform Mobile Development (Android) 17.0.31822.380 Visual C++ for Cross Platform Mobile Development (Android) Visual F# Tools 17.0.0-beta.21522.2+6d626ff0752a77d339f609b4d361787dc9ca93a5 Microsoft Visual F# Tools Visual Studio Code Debug Adapter Host Package 1.0 Interop layer for hosting Visual Studio Code debug adapters in Visual Studio Visual Studio Container Tools Extensions 1.0 View, manage, and diagnose containers within Visual Studio. Visual Studio IntelliCode 2.2 AI-assisted development for Visual Studio. Visual Studio Tools for CMake 1.0 Visual Studio Tools for CMake Visual Studio Tools for Containers 1.0 Visual Studio Tools for Containers Visual Studio Tools for Unity 17.0.4.0 Visual Studio Tools for Unity VisualStudio.DeviceLog 1.0 Information about my package VisualStudio.Foo 1.0 Information about my package VisualStudio.Mac 1.0 Mac Extension for Visual Studio Xamarin 17.0.0.343 (d17-0@fb07a17) Visual Studio extension to enable development for Xamarin.iOS and Xamarin.Android. Xamarin Designer 17.0.0.183 (remotes/origin/d17-0@a351f0f1f) Visual Studio extension to enable Xamarin Designer tools in Visual Studio. Xamarin Templates 17.0.17 (9e779b0) Templates for building iOS, Android, and Windows apps with Xamarin and Xamarin.Forms. Xamarin.Android SDK 12.1.0.5 (d17-0/6b0e6b2) Xamarin.Android Reference Assemblies and MSBuild support. Mono: c633fe9 Java.Interop: xamarin/java.interop/d17-0@febb1367 ProGuard: Guardsquare/proguard/v7.0.1@912d149 SQLite: xamarin/sqlite/3.36.0@a575761 Xamarin.Android Tools: xamarin/xamarin-android-tools/d17-0@a5194e9 Xamarin.iOS and Xamarin.Mac SDK 15.4.0.0 (8fc41ae82) Xamarin.iOS and Xamarin.Mac Reference Assemblies and MSBuild support. ```

Build Logs

Workaround

No workaround

SwissCheezze commented 2 years ago

can you check if there is something that's returning null on the page you're trying to navigate?

LeonSweden commented 2 years ago

nothing returned. it creates exception long before that is possible.

one comment though: if I go to the page manually first and then pops back to the page that has this async call - it works. so it looks like something needs to be "warmed up" first. unclear with what since it is internal to Xamarin.

jfversluis commented 2 years ago

Please add all the details as requested in the issue template. At the very least: which Xamarin.Forms version are you using? Some code that triggers this will be very helpful and ideally a reproduction sample that shows this issue. Thanks!