Automapper map custom collection

Question

Hi im having difficulties mapping a custom pagedlist collection i have created.

I have a pagedList interface like this:

public interface IPagedList<T> : IList<T>

And the implementation:

public class PagedList<T> : List<T>, IPagedList<T>

Mapping config:

Mapper.CreateMap<User, DestinationViewModel>()
  .ForMember(f => f.Score, m => m.MapFrom(s => s.anotherProperty));

I try to map a collection in my controller action like this:

var users = userService.GetPagedUsers(page, size, sort, direction);
var model = Mapper.Map<IPagedList<User>, IPagedList<DestinationViewModel>>(users);

Firstly, is it even possible to do this? I have had a scout around on stack and havent found a definitive answer. I have had no luck so far i have only received InvalidCastOperations cannot map generic collection of User to pagedlist of DestinationViewModel, which were thrown by automapper. Using a different list type like IList when mapping to the model works, but I need to use the IPagedList interface for all the paging stuff it has. Any help would be greatly appreciated, been pulling my hair out too long on this.

Answer 1

Ended up finding an answer after more research, which is no, automapper doesnt support my scenario out out of the box. The two options from here are: To a custom IObjectMapper, using the existing Array/EnumerableMappers as a guide, or write a custom TypeConverter.

Answer 2

In fact, I believe there is a solution to this question.

Mapping config:

Mapper.CreateMap<User, DestinationViewModel>();
Mapper.CreateMap<PagedList<User>, PagedList<DestinationViewModel>>()
      .AfterMap((s, d) => Mapper.Map<List<User>, List<DestinationViewModel>>(s, d));

Then in service/controller:

var users = userService.GetPagedUsers(page, size, sort, direction);
var model = Mapper.Map<PagedList<User>, PagedList<DestinationViewModel>>(users);

I have not tried using the interface (IPagedList), only implementation (PagedList).