Conditionally mapping one source type to two destination types

Question

I have a source DTO like this

public class Member 
{
    public string MemberId {get;set;}
    public string MemberType {get;set;}
    public string Name {g         


        

Answer 1

Introduce some base class Member. Inherit PersonMember, CompanyMember from the new base class.

Then define these mappings:

cfg.CreateMap()
    .ConstructUsing((memberDto, context) => {
    switch (memberDto.MemberType)
    {
        case "PersonMember":
            return context.Mapper.Map(memberDto);
        case "CompanyMember":
            return context.Mapper.Map(memberDto);
        default:
            throw new ArgumentOutOfRangeException($"Unknown MemberType {memberDto.MemberType}");
    }
});

cfg.CreateMap()
    .ForMember(dest => PersonMember.PersonMemberId,
               opt => opt.MapFrom(src => src.MemberId));

cfg.CreateMap()
    .ForMember(dest => CompanyMember.CompanyMemberId,
               opt => opt.MapFrom(src => src.MemberId));

Now you can map using _mapperInstance.Map(memberDto);