Mapa de Automapper de un objeto a objetos anidados

What is the best way to map inner objects with Automapper 2.0

  1. Use the solution in this pregunta (Automapper 1.0)

  2. Create a Custom Value Resolvers

  3. ?

    public class DTOObject
        // MainObject
        public int Id { get; set; }
        public string Name { get; set; }
        // SubObject (TopObject)
        public string TopText { get; set; }
        public string TopFont { get; set; }
        // SubObject (BottomObject)
        public string BottomText { get; set; }
        public string BottomFont { get; set; }
    public class MainObject
        public int Id { get; set; }
        public string Name { get; set; }
        public SubObject TopObject { get; set; }
        public SubObject BottomObject { get; set; }
    public class SubObject
        public string SubPropText { get; set; }
        public string SubPropFont { get; set; }

Resolvedores de valor personalizados

    public class CustomResolver : ValueResolver<DTOObject, SubObject>
        protected override SubObject ResolveCore(DTOObject source)
            return Mapper.Map<DTOObject, SubObject>(source);

preguntado el 02 de febrero de 12 a las 10:02

Do you have control of the design of the DTOObject? -

Yes, and no this is a old data base that is in heavy use. -

Which direction are you trying to go, DTOObject to MainObject or MainObject to DTOObject? -

Probablemente sea mejor usar Mapper.CreateMap<DTOObject, MainObject>().ForMember(d => d.TopObject, mc => mc.MapFrom(s => new SubObject(){ SubPropText = s.TopText, SubPropFont = s.TopFont } )); -

Also note, in your CustomResolver you shouldn't call Mapper.Map() you should create the SubObject using the properties from the source and return that. -

3 Respuestas

For me it was possible to use just MapFrom (without ResolveUsing what gives you a chance to use this mapping with IQueryable extensions). So you will get the following in the Automapper configuration:

Mapper.CreateMap<DTOObject, SubObject>()
    .ForMember(dest => dest.SubPropText, opt => opt.MapFrom(x => x.BottomText))
    .ForMember(dest => dest.SubPropFont, opt => opt.MapFrom(x => x.BottomFont));

Mapper.CreateMap<DTOObject, MainObject>()
    .ForMember(dest => dest.SubPart, opt => opt.MapFrom(x => x));

respondido 09 nov., 15:04

I ended up creating my own value resolvers for any SubObjects of MainObject que vienen de DTOObject.

public class PartResolver<T> : ValueResolver<DTOObject, T>
    protected override T ResolveCore(DTOObject source)
        return Mapper.Map<T>(source);

Then in my Automapper config I create a map from the DTOObject a SubObject and use the ValueResolver to map that object into the MainObject

Mapper.CreateMap<DTOObject, SubObject>();

Mapper.CreateMap<DTOObject, MainObject>()
    .ForMember(dest => dest.SubPart, opt => opt.ResolveUsing<PartResolver<SubObject>>());

Respondido 17 Feb 12, 15:02

ResolveUsing is not available with latest version of AutoMapper. So only option left is to use MapaDesde. (use @ZedRoth solution).

Respondido 02 Feb 21, 19:02

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