Exception being thrown on android physical device with latest version of .NET MAUI

[vsfeedback]

This issue has been moved from a ticket on Developer Community.

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When I attempt to run my .NET MAUI application on a physical device, I'm getting hit with the following exception

$exception  {System.IO.FileNotFoundException: 
File name: 'System.Private.CoreLib.resources'
   at System.Reflection.Assembly.Load(AssemblyName assemblyRef, StackCrawlMark& stackMark, AssemblyLoadContext assemblyLoadContext)
   at System.Reflection.RuntimeAssembly.InternalGetSatelliteAssembly(Assembly assembly, CultureInfo culture, Version version, Boolean throwOnFileNotFound)} System.IO.FileNotFoundException

If I enabled the CLR debug, it's revealing more

[monodroid-assembly] open_from_bundles: failed to load assembly System.Text.RegularExpressions.dll
Loaded assembly: /data/data/com.companyname.compencrypt/files/.__override__/System.Text.RegularExpressions.dll [External]
[monodroid-assembly] open_from_bundles: failed to load assembly en-GB/System.Private.CoreLib.resources.dll
[monodroid-assembly] open_from_bundles: failed to load assembly en-GB/System.Private.CoreLib.resources.dll
**System.IO.FileNotFoundException:** 'Loading...'

[monodroid-assembly] open_from_bundles: failed to load assembly en-GB/System.Private.CoreLib.resources.dll
[monodroid-assembly] open_from_bundles: failed to load assembly en-GB/System.Private.CoreLib.resources.dll
[monodroid-assembly] open_from_bundles: failed to load assembly en/System.Private.CoreLib.resources.dll
[monodroid-assembly] open_from_bundles: failed to load assembly en/System.Private.CoreLib.resources.dll

The error shows in App.xaml.cs when the InitialiseComponent is called and if I try to access anything in my Languages.Resources file or use DI to access platform specific code. On an emulator, the code works as expected.

Using .NET MAUI 6.0.300-rc.2.5513

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Original Comments

Feedback Bot on 4/30/2022, 09:39 PM:

(private comment, text removed)

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Original Solutions

(no solutions)

[Eilon]

Tagging @jonathanpeppers @eerhardt in case this looks familiar.

[jonathanpeppers]

Would the original author (Paul Johnson) be able to share a small sample project that hits this issue?

I suspect there might be something wrong when using .resx files from a class library, but there isn't enough information to know if that is the problem. We have a few tests around .resx in xamarin/xamarin-android, and they seem to be passing.

Hi @vsfeedback. We have added the "s/needs-info" label to this issue, which indicates that we have an open question for you before we can take further action. This issue will be closed automatically in 7 days if we do not hear back from you by then - please feel free to re-open it if you come back to this issue after that time.

[timvandenhof]

While I'm not the original author, I faced this issue on my experimental app as well.
The strange thing is that you can continue after that the exception is thrown.

{System.IO.FileNotFoundException: 
File name: 'System.Private.CoreLib.resources'
   at System.Reflection.Assembly.Load(AssemblyName assemblyRef, StackCrawlMark& stackMark, AssemblyLoadContext assemblyLoadContext)
   at System.Reflection.RuntimeAssembly.InternalGetSatelliteAssembly(Assembly assembly, CultureInfo culture, Version version, Boolean throwOnFileNotFound)}

Physical device: Google Pixel 5, Android 12.1 (SDK 32). --> Reproduction
Emulator: Google Pixel 5, Android 11 (SDK 30) --> No reproduction

I have the following additional information:

• There are RESX-files in my solution at all.
• Project was created with RC1, later upgraded to RC2 then RC3.
• Not able to reproduce with the default untouched MAUI app from file new project (MAUI RC3, VS 2022 17.3.0-preview-1)

[Eilon]

@timvandenhof said:

There are RESX-files in my solution at all.

You mean there are, or aren't?

[jonathanpeppers]

If someone has an idea of what API you're using that causes this, or can reproduce it in a sample app that would help us solve this.

The problem is the stack trace above, doesn't really show what the problematic code is...

Thanks!

[nodoid]

Would the original author (Paul Johnson) be able to share a small sample project that hits this issue?

I suspect there might be something wrong when using .resx files from a class library, but there isn't enough information to know if that is the problem. We have a few tests around .resx in xamarin/xamarin-android, and they seem to be passing.

Test code showing the issue : https://github.com/nodoid/CompEncrypt - works fine on iOS and the app builds on Android but errors out when run in debug mode - in release mode it's fine

[jonathanpeppers]

@nodoid are you seeing the above application crash on a device? Debug mode only?

The app seems to work for me, it does look like maybe the layout has an issue:

Are you using the latest MAUI RC 3 builds that went out last week?

[kojini]

I have the same issue on my Android emulator.
Visual Studio: 17.2.0 Preview 4.0
Android emulator: Pixel 5, API 30

If I ticket all the items in Common Language Runtime Exceptions, the exception gets caught. It doesn't get caught if CLR exception settings is default.
I set it to default and run my app, and the app runs without problem.