AutoMapper map nested list of objects within list of objects

Question

I have these classes:

public class Course
{
public int CourseId;
public List<Exam> Exams;
}

public class Exam
{
public int ExamId;
public float Score;
}

These are my ViewModels:

public class CourseVM
{
public int CourseId;
public List<ExamVM> Exams;
}

public class ExamVM
{
public int ExamId;
public float Score;
public bool Selected;
}

This is the code I'm using to map a List of Courses to a List of CourseVM. I'm having a problem trying to map the property Exams within CourseVM since is a ViewModel too(ExamVM). Any idea on how to do this using AutoMapper?

examsVM = _mapper.Map<List<Course>, List<CourseVM>>(coursesList);

UPDATE Mapping rules:

CreateMap<Course, CourseVM>()

@feihoa yes, added then in the question too, trying different things in that direction now — AlexGH
– AlexGH, Commented May 12, 2021 at 15:39
CreateMap<Exam, ExamVM>() is specified as well? Also, try to make all the fields properties: public int CourseId {get; set;} — feihoa
– feihoa, Commented May 12, 2021 at 15:41
@feihoa tried that and worked, just came back to put an answer and saw your comment, feel free to add it as an answer and I'll choose it ;) — AlexGH
– AlexGH, Commented May 12, 2021 at 15:46

feihoa · Accepted Answer · 2021-05-12 15:48:27Z

1

Be sure that proper config is specified:

CreateMap<Exam, ExamVM>();

Try to make properties from the fields:

public int CourseId { get; set; }

answered May 12, 2021 at 15:48

feihoa

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Comments

KarolZirex · Accepted Answer · 2021-05-12 15:37:37Z

Did you write MappingProfile?

If u want to use automapper u have to tell him how u wanna map.

there is example of automapper profile:

public class RestaurantMappingProfile: Profile
    {
        public RestaurantMappingProfile()
        {
            CreateMap<Restaurant, RestaurantDto>()
                .ForMember(m => m.City, c => c.MapFrom(s => s.Address.City))
                .ForMember(m => m.Street, c => c.MapFrom(s => s.Address.Street))
                .ForMember(m => m.ZipCode, c => c.MapFrom(s => s.Address.ZipCode));
           
            CreateMap<Dish, DishDto>();
           
            CreateMap<CreateRestaurantDto, Restaurant>()
                .ForMember(r => r.Address, c => c.MapFrom(dto => new Address()
                        { City = dto.City, ZipCode = dto.ZipCode, Street = dto.Street }));
            
            CreateMap<CreateDishDto, Dish>();
        
        
        
        }

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