Mapping "long" to create an object

Question

iam trying to map just a long field coming from my url route to create a Query Object from my controller, can i use auto mapper

CreateMap(MemberList.None);

Source :-long id

Destination:-

public class GetPlanQuery : IRequest<PlanDto>
    {
        public long Id { get; }
        public GetPlanQuery(long id)
        {
            Id = id;
        }

        internal sealed class GetPlanQueryHandler : IRequestHandler<GetPlanQuery, PlanDto>
        {
           //Logic will go here
        }
    }

Map i am using is as below

CreateMap<long, GetPlanQuery>(MemberList.None);

i am getting an exception while executing as

System.ArgumentException:
needs to have a constructor with 0 args or only optional args.'

http://docs.automapper.org/en/latest/Custom-type-converters.html — Lucian Bargaoanu, Jun 13 '19 at 16:37

Prolog · Accepted Answer · 2019-08-03T10:29:54.647

As Lucian correctly suggested you can achieve this kind of custom mapping by implementing ITypeConverter:

public class LongToGetPlanQueryTypeConverter : ITypeConverter<long, GetPlanQuery>
{
    public GetPlanQuery Convert(long source, GetPlanQuery destination, ResolutionContext context)
    {
        return new GetPlanQuery(source);
    }
}

then specify it's usage in AutoMapper configuration:

configuration.CreateMap<long, GetPlanQuery>()
    .ConvertUsing<LongToGetPlanQueryTypeConverter>();

EDIT

Alternatively, you can just use a Func:

configuration.CreateMap<long, GetPlanQuery>()
    .ConvertUsing(id => new GetPlanQuery(id));

For such a simple converter a Func overload works better. – Lucian Bargaoanu Aug 03 '19 at 10:26 — Lucian Bargaoanu, Aug 03 '19 at 10:26

Mapping "long" to create an object

1 Answers1

EDIT