Automapper map from one object to nested objects

问题

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

Use the solution in this question (Automapper 1.0)
Create a Custom Value Resolvers

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; }
}

Custom Value Resolvers

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

回答1:

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));

回答2:

I ended up creating my own value resolvers for any SubObjects of MainObject that come from 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 to 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>>());

来源：https://stackoverflow.com/questions/9110815/automapper-map-from-one-object-to-nested-objects

标签

automapper

automapper-2