How to Map DTO class to "Model" class In generic Repository - asp.net-core

Question

I use DTO class in API layer and I struggle to map DTO class to "model" class in generic Repository.cs in core layer.
Repository.cs :
namespace DTOMap.Core.Repository.Generic
{
public class Repository<T> : IRepository<T> where T : class
{
private DTOMapContext _context;
private DbSet<T> _table;
private IMapper _mapper;
public Repository(DTOMapContext context)
{
_context = context;
_table = _context.Set<T>();
var config = new MapperConfiguration(cfg =>
{
cfg.AddProfile<MyMapper>();
});
_mapper = config.CreateMapper();
}
public T Add(T obj)
{
// Here how to use My Mapper to save a book or an author generically
// Sth like :
// temp = _table.Add(_mapper.Map<T>(obj)); Here I want to map Dto to model to save in the db
// return = (_mapper.Map<T>(temp)); Here I want to map Model to DTO to collect it in API
// but I can't have a reference to TDTO
throw new NotImplementedException();
}
}
}
I show you the other classes that I find useful (I only implement Add function for this example and I am a beginner in .Net) :
Author.cs
namespace DTOMap.Core.Models
{
[Table("Author")]
internal class Author
{
[Key]
public int id { get; set; }
[Required, MaxLength(255)]
public string firstName { get; set; }
[Required,MaxLength(255)]
public string lastName { get; set; }
}
}
Book.cs
namespace DTOMap.Core.Models
{
[Table("Book")]
internal class Book
{
[Key]
public int id { get; set; }
[Required,MaxLength(255)]
public string name { get; set; }
[Required]
public int authorId { get; set; }
[Required]
public Author author { get; set; }
}
}
AuthorDTO.cs
namespace DTOMap.Domain.DTO
{
public class AuthorDTO
{
public int id { get; set; }
public string firstName { get; set; }
public string lastName { get; set; }
}
}
BookDTO.cs
namespace DTOMap.Domain.DTO
{
public class BookDTO
{
public int id { get; set; }
public string name { get; set; }
public int authorId { get; set; }
public AuthorDTO author { get; set; }
}
}
IRepository.cs
namespace DTOMap.Domain.Interface
{
public interface IRepository<T>
{
T Add(T obj);
}
}
MyMapper.cs
namespace DTOMap.Core
{
public class MyMapper : Profile
{
public MyMapper()
{
CreateMap<Book, BookDTO>();
CreateMap<BookDTO, Book>();
CreateMap<Author, AuthorDTO>();
CreateMap<AuthorDTO, Author>();
}
}
}
program.cs
... Some Fcts
builder.Services.AddTransient<IRepository<BookDTO>, BookRepository>();
builder.Services.AddTransient<IRepository<AuthorDTO>, AuthorRepository>();
... Some Fcts
If you need any other information, please ask me.