Automapper Exception on construction-CodePudding

I recently updated a project from .net5 to .net6 and now I get a error when trying to resolve automapper(11.0.1) from DI (or instantiating it).

services.AddAutoMapper(typeof(MatchProfile).Assembly);

Instantiation:

var mapper = services.GetService<IMapper>();

Stacktrace:

System.InvalidOperationException: Sequence contains no matching element
   at System.Linq.ThrowHelper.ThrowNoMatchException()
   at System.Linq.Enumerable.Single[TSource](IEnumerable`1 source, Func`2 predicate)
   at AutoMapper.Configuration.MemberConfigurationExpression`3.Configure(TypeMap typeMap)
   at AutoMapper.Configuration.MappingExpressionBase.Configure(TypeMap typeMap)
   at AutoMapper.ProfileMap.BuildTypeMap(IGlobalConfiguration configurationProvider, ITypeMapConfiguration config)
   at AutoMapper.ProfileMap.Register(IGlobalConfiguration configurationProvider)
   at AutoMapper.MapperConfiguration.Seal()
   at AutoMapper.MapperConfiguration..ctor(MapperConfigurationExpression configurationExpression)
   at Microsoft.Extensions.DependencyInjection.ServiceCollectionExtensions.<>c.<AddAutoMapperClasses>b__12_2(IServiceProvider sp)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSiteMain(ServiceCallSite callSite, TArgument argument)

is there a way to find out in which profile the error is located? Can I debug this in some way?

at AutoMapper.Configuration.MemberConfigurationExpression`3.Configure(TypeMap typeMap)

The error above is not really a useful tip to find the error, since the project is pretty large and I dont really want to comment out row for fow.

Created a unit test for this, which throws exactly the same error:

[TestClass]
public class MapperTests
{
    [TestMethod]
    public void AssertConfigIsValid()
    {
        var configuration = new MapperConfiguration(cfg =>
        {
            cfg.AddMaps(typeof(ReportsProfile).Assembly);
        });

        configuration.AssertConfigurationIsValid();
    }
}

Edit:

ViewModels:

public class AnswerModel
{
    public ICollection<AnswerFieldModel> Fields { get; set; }
}

public abstract class AnswerFieldModel
{
    public Guid FieldId { get; set; }

    public abstract object GetValue();

}

public sealed class AnswerFieldModel<TValue> : AnswerFieldModel
{
    public TValue Value { get; set; }

    public override object GetValue() => Value;

}

MappingProfile:

CreateMap<Domain.Entities.Reports.ValueObjects.Answer, AnswerModel>()
    .ForMember(dest => dest.Fields, opt => opt.MapFrom(src => src.Fields))
    .ReverseMap();

CreateMap<Domain.Entities.Reports.ValueObjects.AnswerField, AnswerFieldModel>()
    .ForMember(dest => dest.FieldId, opt => opt.MapFrom(src => src.FieldId))
    .Include(typeof(Domain.Entities.Reports.ValueObjects.AnswerField<>), typeof(AnswerFieldModel<>))
.ReverseMap();

CreateMap(typeof(Domain.Entities.Reports.ValueObjects.AnswerField<>), typeof(AnswerFieldModel<>))
    .ForMember("Value", opt => opt.MapFrom("Value"))
    .ReverseMap();

CodePudding user response：

Since the error originated in MemberConfigurationExpression.Configure(), I have found the problem in the following mapping expression:

CreateMap(typeof(Domain.Entities.Reports.ValueObjects.AnswerField<>), typeof(AnswerFieldModel<>))
    //.ForMember("Value", opt => opt.MapFrom("Value"))
    .ReverseMap();

When this .ForMember("Value", opt => opt.MapFrom("Value")) is commented out everything works as expected. In AM 10.1.1 this didn't throw an error though.

Here is the documentation on how to map open generics.