`AutoMapperMappingException` after migrating from AutoMapper to Mapperly in ABP (.NET 9 → .NET 10) #10330

12 Answer(s)

• 

  0

  AI-Bot created 5 days ago

  Support Team ABP Agent

  1. Why you still see AutoMapperMappingException

  • The exception is thrown by AutoMapper, which means that in your app the ABP ObjectMapper is still using AutoMapper as the IAutoObjectMappingProvider.
  • After you converted your profiles to Mapperly mappers, AutoMapper no longer has maps for those types, so calls like ObjectMapper.Map<TSource, TDestination>() fail with:

  AutoMapper.AutoMapperMappingException
    Message=Missing type map configuration or unsupported mapping.
  

  • When you inject and use the Mapperly mapper class directly, it works because that bypasses ABP’s ObjectMapper abstraction entirely.

  To fix this, you must explicitly configure ABP to use Mapperly as the default object mapper.

  ---

  1. Solution

  Follow these concrete steps (for ABP 10.0.2):

  A. Switch modules from AutoMapper to Mapperly

  In all projects where you had AutoMapper integration:

  1. csproj references

     • Replace:

  <PackageReference Include="Volo.Abp.AutoMapper" Version="..." />
  

  with:

  <PackageReference Include="Volo.Abp.Mapperly" Version="..." />
  

  2. Module dependencies and usings

     In each module (e.g. YourProjectDomainModule, YourProjectApplicationModule, YourProjectBlazorModule, YourProjectHttpApiHostModule, etc.):

     • Replace:

  using Volo.Abp.AutoMapper;
  
     [DependsOn(
         typeof(AbpAutoMapperModule),
         // ...
     )]
     public class YourProjectXXXModule : AbpModule
     {
         public override void ConfigureServices(ServiceConfigurationContext context)
         {
             context.Services.AddAutoMapperObjectMapper<YourProjectXXXModule>();
  
             Configure<AbpAutoMapperOptions>(options =>
             {
                 options.AddMaps<YourProjectXXXModule>(validate: true);
             });
         }
     }
  

  with:

  using Volo.Abp.Mapperly;
  
     [DependsOn(
         typeof(AbpMapperlyModule),
         // ...
     )]
     public class YourProjectXXXModule : AbpModule
     {
         public override void ConfigureServices(ServiceConfigurationContext context)
         {
             // Register Mapperly object mapper for this module
             context.Services.AddMapperlyObjectMapper<YourProjectXXXModule>();
         }
     }
  

  Notes:

  • Remove all Configure<AbpAutoMapperOptions>(...) blocks.
  • Remove AbpAutoMapperModule from all [DependsOn] attributes.
  • Keep only AbpMapperlyModule (plus your other existing module dependencies).

  B. Set Mapperly as the default object mapper for ObjectMapper.Map

  In at least one root module that is loaded in every app (e.g. your main host / UI / application module), explicitly register the non-generic AddMapperlyObjectMapper so ABP’s default IObjectMapper uses Mapperly:

  using Volo.Abp.Mapperly;
  
  [DependsOn(typeof(AbpMapperlyModule))]
  public class YourProjectHttpApiHostModule : AbpModule
  {
      public override void ConfigureServices(ServiceConfigurationContext context)
      {
          // Make Mapperly the default IAutoObjectMappingProvider used by ObjectMapper.Map<,>()
          context.Services.AddMapperlyObjectMapper();
      }
  }
  

  This is the key step that makes:

  ObjectMapper.Map<TSource, TDestination>(source);
  

  go through Mapperly, not AutoMapper.
  (From the migration guide: “If your application uses Mapperly: context.Services.AddMapperlyObjectMapper();”)

  C. Ensure your Mapperly mappers are properly defined

  Mapperly mappers should look like:

  using Riok.Mapperly.Abstractions;
  using Volo.Abp.Mapperly;
  
  [Mapper] // RequiredMappingStrategy = Target is default in ABP integration
  public partial class MyEntityToMyDtoMapper : MapperBase<MyEntity, MyDto>
  {
      public override partial MyDto Map(MyEntity source);
      public override partial void Map(MyEntity source, MyDto destination);
  }
  

  ABP’s Mapperly integration automatically:

  • Registers all [Mapper] classes in DI.
  • Connects them to ObjectMapper based on <TSource, TDestination>.

  You don’t need to manually wire each mapper to ObjectMapper.

  D. If you use contextual mappers (IObjectMapper<TContext>)

  If somewhere you use a contextual mapper (or ObjectMapperContext), keep the generic registration:

  context.Services.AddMapperlyObjectMapper<MyProjectApplicationModule>();
  

  and in the consumer (e.g., ApplicationService, Blazor page):

  public class MyAppService : ApplicationService
  {
      public MyAppService()
      {
          ObjectMapperContext = typeof(MyProjectApplicationModule);
      }
  
      public Task<MyDto> GetAsync()
      {
          // This now uses Mapperly, via the module-specific object mapper
          return Task.FromResult(ObjectMapper.Map<MyEntity, MyDto>(entity));
      }
  }
  

  This pattern is the same as with AutoMapper, just using Mapperly registration.

  ---

  2. Sources

  • Migration guide – “Migrating from AutoMapper to Mapperly”
    (sections Migration Steps and Set Default Mapping Provider – AddMapperlyObjectMapper)
    https://abp.io/docs/10.0/release-info/migration-guides/AutoMapper-To-Mapperly

  • Object-to-object mapping – Mapperly integration & registration (AbpMapperlyModule, AddMapperlyObjectMapper, MapperBase, TwoWayMapperBase)
    https://abp.io/docs/latest/framework/infrastructure/object-to-object-mapping

  ---

  This response was generated by AI. If it didn’t solve your problem, feel free to post a new answer — our support team will jump in to help you soon.

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• 

  0

  maliming created 5 days ago

  Support Team Fullstack Developer

  hi

  Which DTOs are you trying to map?

  Can you call the AddMapperlyObjectMapper in your module?

  public override void ConfigureServices(ServiceConfigurationContext context)
  {
      context.Services.AddMapperlyObjectMapper();
  }
  

  Thanks.

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• 

  0

  pareeks@gccontractor.org created 5 days ago

  Yes, it's already configured

  [DependsOn(
      typeof(IseCoreDomainModule),
      typeof(IseCoreApplicationContractsModule),
      typeof(AbpDddApplicationModule),
      typeof(AbpMapperlyModule)
      )]
  public class IseCoreApplicationModule : AbpModule
  {
      public override void ConfigureServices(ServiceConfigurationContext context)
      {
          context.Services.AddMapperlyObjectMapper<IseCoreApplicationModule>();
      }
  }
  

  Trying to do: var filter = ObjectMapper.Map<HrMissionaryLookupRequestDto, HrMissionaryLookupFilter>(input); but getting error.

  Here is the configuration for mapperly in file IseCoreApplicationMappers.cs

  [Mapper]
  public partial class HrMissionaryLookupRequestDtoToHrMissionaryLookupFilterMapper
      : MapperBase<HrMissionaryLookupRequestDto, HrMissionaryLookupFilter>
  {
      public override partial HrMissionaryLookupFilter Map(HrMissionaryLookupRequestDto source);
  
      public override partial void Map(
          HrMissionaryLookupRequestDto source,
          HrMissionaryLookupFilter destination
      );
  }
  

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• 

  0

  maliming created 5 days ago

  Support Team Fullstack Developer

  hi

  Can you share a demo project?

  liming.ma@volosoft.com

  Thanks.

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• 

  0

  pareeks@gccontractor.org created 5 days ago

  I can give you the remote access of my system, let me know when you're comfortable to connect Thanks!

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• 

  0

  maliming created 5 days ago

  Support Team Fullstack Developer

  hi

  Can you share the source code?

  Thanks.

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• 

  0

  pareeks@gccontractor.org created 5 days ago

  Hi, I've shared the application code for one of the module with you. Please have a look. It's a production app, not a test app, so I cannot share the whole source code with you. Thanks!

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• 

  0

  maliming created 5 days ago

  Support Team Fullstack Developer

  hi

  Can you set the ObjectMapperContext in the constructor or in the base class?

  

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• 

  0

  pareeks@gccontractor.org created 5 days ago

  It worked, thanks!

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• 

  0

  maliming created 5 days ago

  Support Team Fullstack Developer

  Great 👍

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• 

  0

  pareeks@gccontractor.org created 5 days ago

  I didn't find this fix in the ABP documentation anywhere. Could you please share the documentation here so that I can have a look. Thanks!

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• 

  0

  maliming created 5 days ago

  Support Team Fullstack Developer

  hi

  https://abp.io/docs/latest/framework/infrastructure/object-to-object-mapping#iobjectmapper-interface

  

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  1