Pass Objects to AutoMapper Mapping

AutoMapper 9.0.0

As of version 8.0.0 the API of AutoMapper has been changed. In doing so ResolveUsing was consolidated with MapFrom. Take a look at the corresponding pull request for further information.

Profile

public class CoreProfile : Profile
{
    public CoreProfile()
    {
        CreateMap<Source, Destination>()
            .ForMember(d => d.Bar,
                opt => opt.MapFrom(
                    (src, dst, _, context) => context.Options.Items["bar"]
                )
            );    
    }
}

Mapping

var destination = mapper.Map<Destination>(
    source,opt => {
        opt.Items["bar"] = "baz";
    }
);

AutoMapper handles this key-value pair scenario out of the box.

Mapper.CreateMap<Source, Dest>()
    .ForMember(d => d.Foo, opt => opt.ResolveUsing(res => res.Context.Options.Items["Foo"]));

Then at runtime:

Mapper.Map<Source, Dest>(src, opt => opt.Items["Foo"] = "Bar");

A bit verbose to dig into the context items but there you go.