Latest 5.0.2 gives .net standard 2.1 not compatable with NETFrameworks & Mono.Linker.MarkException using 4.1.4

[LeoJHarris]

Issue below occuring in Release mode on android when building project:

Upgrading to latest on this library is causing issues with my UITest project which uses NETFramework 4.6.1 .

netstandard 2.1 is not compatable with any .NETFramework: https://docs.microsoft.com/en-us/dotnet/standard/net-standard

Error is below failing my build:

 sampleApp targets 'netstandard2.1'. It cannot be referenced by a project that targets '.NETFramework,Version=v4.6.1'

Im guessing latest version on this plugin prevents referencing projects with NETFramework

I tried a work around by dropping down to version 4.1.4 but I issues (see below) which I think is the linker stripping out some classes maybe? I dont want to set linking to none but if this is a linker issue any ideas how to fix this? Again guessing I need a line to the proguard.cfg to keep some classes?

Mono.Linker.MarkException: Error processing method: 'System.Void SampleApp.Droid.Resource::UpdateIdValues()' in assembly: 'SampleApp.Android.dll' ---> Mono.Cecil.ResolutionException: Failed to resolve System.Int32 Plugin.LocalNotification.Resource/Attribute::coordinatorLayoutStyle

Full exception:

Severity	Code	Description	Project	File	Line	Suppression State
Error		Mono.Linker.MarkException: Error processing method: 'System.Void SampleApp.Droid.Resource::UpdateIdValues()' in assembly: 'SampleApp.Android.dll' ---> Mono.Cecil.ResolutionException: Failed to resolve System.Int32 Plugin.LocalNotification.Resource/Attribute::coordinatorLayoutStyle
   at Mono.Linker.Steps.MarkStep.HandleUnresolvedField(FieldReference reference)
   at Mono.Linker.Steps.MarkStep.MarkField(FieldReference reference)
   at Mono.Linker.Steps.MarkStep.MarkInstruction(Instruction instruction)
   at Mono.Linker.Steps.MarkStep.MarkMethodBody(MethodBody body)
   at Mono.Linker.Steps.MarkStep.ProcessMethod(MethodDefinition method)
   at Mono.Linker.Steps.MarkStep.ProcessQueue()
   --- End of inner exception stack trace ---
   at Mono.Linker.Steps.MarkStep.ProcessQueue()
   at Mono.Linker.Steps.MarkStep.ProcessPrimaryQueue()
   at Mono.Linker.Steps.MarkStep.Process()
   at Mono.Linker.Steps.MarkStep.Process(LinkContext context)
   at MonoDroid.Tuner.MonoDroidMarkStep.Process(LinkContext context)
   at Mono.Linker.Pipeline.ProcessStep(LinkContext context, IStep step)
   at Mono.Linker.Pipeline.Process(LinkContext context)
   at MonoDroid.Tuner.Linker.Process(LinkerOptions options, ILogger logger, LinkContext& context)
   at Xamarin.Android.Tasks.LinkAssemblies.Execute(DirectoryAssemblyResolver res)
   at Xamarin.Android.Tasks.LinkAssemblies.RunTask()
   at Xamarin.Android.Tasks.AndroidTask.Execute()	SampleApp.Android	C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\Android\Xamarin.Android.Common.targets	1942	

[thudugala]

@LeoJHarris Can you please attach a sample project

[LeoJHarris]

@thudugala Yes I can get try get a sample, setting the linker to none works for the project to get it to succees the build. Any immediate ideas to get it working with linker enabled to SDK assemblies only? Ill skip linking your libary in the skip linking assemblied that will be the best work around I can think of at this stage.

Although I'm pretty sure adding a certain line to the proguard.cfg will fix the issue, Ill investigate around that first since it might be an easy fix otherwise.

[thudugala]

also look into #72

[LeoJHarris]

@thudugala is there a reason for using .net standard 2.1? Can it not be using 2.0 in latest? Going forward it will have issues with referencing unit testing projects using .NETFramework.

[thudugala]

Version 5 and above is targeting Android 10 (this cannot be changed because of android dependency).
Can you please verify that changing to .net standard 2.0 will help you ? I think .NET Framework does not support Android 10.

[LeoJHarris]

Ill send a sample project as i am unable to get the build working unfortunately. Ill try get something this week.

[LeoJHarris]

@thudugala I migrated my Unit testing project to .net core so I could use latest version of your package and no issue now.

[LeoJHarris]

Can you please verify that changing to .net standard 2.0 will help you ? I think .NET Framework does not support Android 10.

If your just unit testing a .net standard project i.e. the shared code then it shouldnt matter about the android 10 support with .NET Framework?

[thudugala]

I think Android 10 is only a issue for UITest.