带有列表到列表的自动映射器映射异常

Question

I've got problem with Automapper. My mapping call looks like:

var dataContracts = MapperManager.Mapper.Map<List<Employee>, List<EmployeeDTO>>(entities.ToList());

Entity is IQueryable<Employee>

In my Mapper helper class I Have:

public class MapperManager
{
    public static MapperConfiguration MapperConfiguration { get; set; }

    private static IMapper _mapper { get; set; }

    public static IMapper Mapper
    {
        get
        {
            if (_mapper == null) {
                _mapper = MapperConfiguration.CreateMapper();                    
            }

            return _mapper;
        }
    }

    public static void RegisterMappinngs()
    {

        MapperConfiguration = new MapperConfiguration(cfg =>
        {
            ...
            cfg.CreateMap<Employee, EmployeeDTO>().MaxDepth(5);
            ...
        }
    }
}

RegisterMappings is called once on AppStartup in Global.asax and after that I've Exception in Map operation:

var dataContracts = MapperManager.Mapper.Map<List<Employee>, List<EmployeeDTO>>(entities.ToList());

Error mapping types.

Mapping types: List`1 -> List`1 System.Collections.Generic.List`1[[NAMESPACE.Employee, ASSEMBLY, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]] -> System.Collections.Generic.List`1[[NAMESPACE2.EmployeeDTO, ASSEMBLY2, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]]

Anyone can provide any idea what I'm doing wrong?

Best regards

Answer 1

Ok, that was the answer:

MapperConfiguration.AssertConfigurationIsValid()

When I called that, I got AMConfigurationException with unmaped property, deep inside another Employee property.

Thank you for your suggestion

Answer 2

就我而言，这是因为它试图映射本应被忽略的 ID

Answer 3

I was getting this error, I was able to run it in production, but the unit test failed, failed and failed.

Make sure that you include your profile if you setup your own mapper configuration. Also double check your mappings.

var mappingConfig = new MapperConfiguration(mc =>
        {
            mc.AddProfile(new MyMissingProfile());
        });
        
        _mapper = mappingConfig.CreateMapper();