Pass Objects to AutoMapper Mapping

Question

I am working with AutoMapper and some of the values for the entity being mapped to are variables in my current method. I have tried to Google it but to no avail. Can I pass a set of KeyValue Pairs or an object or something to my mapping to have it use those values?

Sample of Post Mapping Modification

//comment variable is a Comment class instance
var imageComment = AutoMapper.Mapper.Map<Data.ImageComment>(comment);
//I want to pass in imageId so I dont have to manually add it after the mapping
imageComment.ImageId = imageId;

Answer 1

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.

Answer 2

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";
    }
);

Answer 3

For Automapper 6.0.2:

Profile:

public class CoreProfile : Profile
{
    public CoreProfile()
    {
        CreateMap<Source, Dest>()
            .ForMember(d => d.Foo,
                opt => opt.ResolveUsing(
                    (src, dst, arg3, context) => context.Options.Items["Foo"]
                )
            );
    }
}

Mapping:

    var result = Mapper.Map<PlanResult>(aa, opt => {
        opt.Items["Foo"] = 2;
        opt.Items["OtherFoo"] = 1000;
    });