Deep level mapping using Automapper
automapper, c#
Solution
This will work both for mapping to a new or to an existing object.
Mapper.CreateMap<FatherModel, Father>()
.ForMember(x => x.Son, opt => opt.MapFrom(model => model));
Mapper.CreateMap<FatherModel, Son>()
.ForMember(x => x.Id, opt => opt.MapFrom(model => model.SonId));
Problem
I am trying to map objects with multi-level members: these are the classes: ``` public class Father { public int Id { get; set; } public Son Son { get; set; } } public class FatherModel { public int Id { get; set; } public int SonId { get; set; } } public class Son { public int Id { get; set; } } ``` This is how I try automap it: ``` AutoMapper.Mapper.CreateMap<FatherModel , Father>() .ForMember(dest => dest.Son.Id, opt => opt.MapFrom(src => src.SonId)); ``` this is the exception that I get: Expression 'dest => Convert(dest.Son.Id)' must resolve to top-level member and not any child object's properties. Use a custom resolver on the child type or the AfterMap option instead. Parameter name: lambdaExpression Thanks