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I use Automapper (v.14) in my .Net MAUI (v.9) app. I configure it as per documentation:

mauiAppBuilder.Services.AddAutoMapper(typeof(MappingProfile));

Then I am trying to resolve IMapper object in constructor of ViewModel

 public MainPageViewModel(IMapper mapper)

Everything works fine on DEBUG. When I switch to Release, I get error:

[AndroidRuntime] android.runtime.JavaProxyThrowable: [System.Reflection.TargetInvocationException]: Arg_TargetInvocationException
[AndroidRuntime]    at System.Reflection.MethodBaseInvoker.InvokeWithNoArgs + 0x58(Unknown Source)
[AndroidRuntime]    at System.RuntimeType.CreateInstanceMono + 0xa8(Unknown Source)
[AndroidRuntime]    at System.RuntimeType.CreateInstanceOfT + 0x0(Unknown Source)
[AndroidRuntime]    at System.Activator.CreateInstance + 0x18(Unknown Source)
[AndroidRuntime]    at Microsoft.Extensions.Options.OptionsFactory`1[[AutoMapper.MapperConfigurationExpression, AutoMapper, Version=14.0.0.0, Culture=neutral, PublicKeyToken=be96cd2c38ef1005]].CreateInstance + 0x0(Unknown Source)
[AndroidRuntime]    at Microsoft.Extensions.Options.OptionsFactory`1[[AutoMapper.MapperConfigurationExpression, AutoMapper, Version=14.0.0.0, Culture=neutral, PublicKeyToken=be96cd2c38ef1005]].Create + 0x0(Unknown Source)
[AndroidRuntime]    at Microsoft.Extensions.Options.UnnamedOptionsManager`1[[AutoMapper.MapperConfigurationExpression, AutoMapper, Version=14.0.0.0, Culture=neutral, PublicKeyToken=be96cd2c38ef1005]].get_Value + 0x54(Unknown Source)
[AndroidRuntime]    at Microsoft.Extensions.DependencyInjection.ServiceCollectionExtensions+<>c.<AddAutoMapperClasses>b__13_4 + 0x6(Unknown Source)
...

I found that it must be a linking problem because everything works fine when I disabled AOT and trimming on Release builds in .csproj

I tried Preserving Automapper Assembly but it didn't work, the exception still occured.

<ItemGroup>
    <TrimmerRootAssembly Include="AutoMapper" RootMode="library" />
</ItemGroup>

Am I missing some important configuration, mixing concepts or something is broken either on maui or automapper side?

Improve this question
4
  • Do you have any obfuscation in place with R8 or Proguard? Commented Mar 6 at 16:59
  • @tomerpacific No I haven't. At least not intentionally. I checked .csproj and project properties and no such option is enabled. Commented Mar 7 at 8:53
  • I found mention of AutoMapper needing the interpreter. Add this line to one of your <PropertyGroup>s: <UseInterpreter>true</UseInterpreter>. NOTE: That is allegedly only required for AutoMapper on iOS. But given your symptom, it is worth trying. Commented Mar 8 at 23:34
  • @ToolmakerSteve I tried but it didn't help, same error occurs. Also documentation says this shouldn't be enabled in android builds Commented Mar 10 at 9:03
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