Automapper merging objects issue

Question

After getting automapper to work (previous question), I\'m struggling with another problem (took it to another question, so the first one wouldn\'t be too complicated)...

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Answer 1

The problem is you want to map a destination property (Entity2) from multiples source property values (Children, Married and HasPet from Model2 and Nickname from Model1).

You can solve your situation using an Custom Resolver or with AfterMap method.

Using Custom Resolvers:

You have to create a class inhering from ValueResolver to define how you will map Entity2 from an SuperModel:

public class CustomResolver : ValueResolver<SuperModel, Entity2>
{
    protected override Entity2 ResolveCore(SuperModel source)
    {
        return new Entity2
        {
            Children = source.Model2.Children,
            HasPet = source.Model2.HasPet,
            Married = source.Model2.Married,
            NickName = source.Model1.NickName
        };
    }
}

Then, use it like this:

CreateMap<SuperModel, SuperEntity>()
    .ForMember(dest => dest.Entity1, opt => opt.MapFrom(src => src.Model1))
    .ForMember(dest => dest.Entity2, opt => opt.ResolveUsing<CustomResolver>());

Using AfterMap:

You can execute actions after the mapping, so pass the value from Model1.Nickname to Entity2.Nickname after the map:

CreateMap<SuperModel, SuperEntity>()
    .ForMember(dest => dest.Entity1, opt => opt.MapFrom(src => src.Model1))
    .ForMember(dest => dest.Entity2, opt => opt.MapFrom(src => src.Model2))
            .AfterMap((m, e) => e.Entity2.NickName = m.Model1.NickName);