[5.0.100-rc.2.20471.7] Single File for OpenMU/HandyControl/TuringTrader target 5.0 app, tests failed

[jiangzeng01]

Application Names: OpenMU
OS: Windows 10 RS5
CPU: X64
.NET Build Number: 5.0.100-rc.2.20471.7
App Location: \appcompatsrv\Appcompat\DotNetCore\AppSource\SingleFileP0AppsTarget5\Apps\OpenMU-5.0
App Source: \appcompatsrv\Appcompat\DotNetCore\AppSource\SingleFileP0AppsTarget5\AppSources\OpenMU-5.0
DevDiv issue: https://devdiv.visualstudio.com/DevDiv/_workitems/edit/1218902

Repro steps:
Retarget 5.0
Single File exe was created by
dotnet publish MUnique.OpenMU.Startup.csproj -r win-x64 -p:PublishSingleFile=true --self-contained true
using 5.0.100-rc.2.20471.7 SDK
Copy '\appcompatsrv\Appcompat\DotNetCore\AppSource\SingleFileP0AppsTarget5\Apps\OpenMU-5.0' to local machine.
Double-click on MUnique.OpenMU.Startup.exe

Expected Result:
Open OpenMU app successful.

Actual Result:
The OpenMU app thrown exception and unable to start.

Findings:
According to the exception, we think it might be caused by related Pull Request:
#40974

Exception from command window for OpenMU:

Unhandled exception. System.TypeInitializationException: The type initializer for 'MUnique.OpenMU.Persistence.EntityFramework.ConnectionConfigurator' threw an exception.
 ---> System.NotSupportedException: CodeBase is not supported on assemblies loaded from a single-file bundle.
   at System.Reflection.RuntimeAssembly.get_CodeBase()
   at MUnique.OpenMU.Persistence.EntityFramework.ConnectionConfigurator.LoadSettings()
   at MUnique.OpenMU.Persistence.EntityFramework.ConnectionConfigurator..cctor()
   --- End of inner exception stack trace ---
   at MUnique.OpenMU.Persistence.EntityFramework.ConnectionConfigurator.Configure(DbContext context, DbContextOptionsBuilder optionsBuilder)
   at MUnique.OpenMU.Persistence.EntityFramework.EntityDataContext.OnConfiguring(DbContextOptionsBuilder optionsBuilder)
   at Microsoft.EntityFrameworkCore.DbContext.get_InternalServiceProvider()
   at Microsoft.EntityFrameworkCore.DbContext.get_DbContextDependencies()
   at Microsoft.EntityFrameworkCore.DbContext.get_Model()
   at MUnique.OpenMU.Persistence.EntityFramework.GenericRepository`1..ctor(PersistenceContextProvider contextProvider)
   at MUnique.OpenMU.Persistence.EntityFramework.AccountRepository..ctor(PersistenceContextProvider contextProvider)
   at MUnique.OpenMU.Persistence.EntityFramework.RepositoryManager.RegisterRepositories(PersistenceContextProvider contextProvider)
   at MUnique.OpenMU.Persistence.EntityFramework.PersistenceContextProvider..ctor()
   at MUnique.OpenMU.Startup.Program.PrepareRepositoryManager(Boolean reinit, Boolean autoupdate)
   at MUnique.OpenMU.Startup.Program..ctor(String[] args)
   at MUnique.OpenMU.Startup.Program.Main(String[] args)

cc @dotnet-actwx-bot

[ghost]

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[jiangzeng01]

We have 3 failed apps effected by this PR: #40974
Effected 3 Apps:
OpenMU
HandyControl
TuringTrader

@LakshanF Please help to confirm if this is by design change.

[agocke]

Should be fixed by #42352

[agocke]

Fixed in #42352

[jiangzeng01]

@agocke We verified with both RC2 build: 5.0.100-rc.2.20480.7 and RTM build:5.0.100-rtm.20508.1, the issue is still happening with the same error log.
which .Net 5 release will the fix #42435 be located?

[agocke]

@jiangzeng01 Sorry, I should have been more detailed. For app compat, the apps may need to pass the IncludeAllContentForSelfExtract=true flag. That should be working in the latest 5.0 RTM builds.

Without that flag, apps may not work without modification to their source code.

[jiangzeng01]

@agocke This issue is verified as fixed with 5.0 RTM.
But there are other issues for 2 of the apps when we continue:
OpenMU (Retarget 5.0): the same issue with target 3.1, #42570
TuringTrader (Retarget 5.0): new issue created, #43251