Using AutoMapper to Map IList to (Iesi.Collections.Generic) ISet

Question

I have been trying to solve this issue for a day now and have got no where so am hoping someone might have solved this before. The closest I found to a solution was How to s

Answer 1

You can use the AfterMap() function of AutoMapper, like this:

Mapper.CreateMap()
      .ForMember(m => m.Children, o => o.Ignore()) // To avoid automapping attempt
      .AfterMap((p,o) => { o.Children = ToISet(p.Children); });

AfterMap() allows for more fine-grained control of some important aspects of NHibernate child collections handling (like replacing existing collections content instead of overwriting the collections reference as in this simplified example).