AutoMapper issue when accessing DTO from ViewModel

Question

Im having a problem mapping back to DTO.

DTO:

public class ServiceEntity : BaseChild { public int Id { get; set; } } public class BaseChild { public string FirstName { get; set; } public string LastName { get; set; } public int Salary { get; set; } public string BkName { get; set; } public int BkPrice { get; set; } public string BkDescription { get; set; } } 

ViewModel:

 public class BusinessEntity { public ChildBussiness Details { get; set; } } public class ChildBussiness { public string NameFirst { get; set; } public string LastName { get; set; } public Books BookDetails { get; set; } public string Salary { get; set; } } public class Books { public string BookName { get; set; } public int BookPrice { get; set; } public string BookDescription { get; set; } } 

controller

For comparison with DTO To ViewModel im, using the code below, and its performance.

 public ActionResult Index() { ServiceEntity obj = GetData(); Mapper.CreateMap<ServiceEntity, BusinessEntity>() .ForMember(d => d.Details, o => o.MapFrom(x => new ChildBussiness { NameFirst = x.FirstName, LastName = x.LastName, Salary = x.Salary.ToString(), BookDetails = new Books { BookDescription = x.BkDescription, BookName = x.BkName, BookPrice = x.BkPrice }})); BusinessEntity objDetails = Mapper.Map<ServiceEntity, BusinessEntity>(obj); } 

When reversed, they fail to do so. Below is the code I tried.

 . . . ServiceEntity objser = new ServiceEntity(); Mapper.CreateMap<BusinessEntity, ServiceEntity>(); Mapper.CreateMap<Books, ServiceEntity>(); objser = Mapper.Map<BusinessEntity, ServiceEntity>(model); . . . 

But I did not get any success. For example, I have provided several properties. I can have more than 30 objects in real time. Any suggestion would be appreciated ...

Answer 1

EDIT So you can change the implementation of BusinessEntity , you can use AutoMapper agreement authority and anti-aliasing. The business object is modified here:

 public class BusinessEntity { public string FirstName { get; set; } // Instead of NameFirst public string LastName { get; set; } public Book Bk { get; set; } // Bk instead of BookDetails public string Salary { get; set; } } public class Book { public string Name { get; set; } // No prefixes public int Price { get; set; } public string Description { get; set; } } 

You need the name Bk to resolve Bk.Name to BkName . Now all displays will be generated in several lines:

 // For mapping from service entity to book Mapper.Initialize(cfg => cfg.RecognizePrefixes("Bk")); Mapper.CreateMap<BusinessEntity, ServiceEntity>(); // Trick to un-flatten service entity // It is mapped both to Book and BusinessEnity Mapper.CreateMap<ServiceEntity, Book>(); Mapper.CreateMap<ServiceEntity, BusinessEntity>() .ForMember(d => d.Bk, m => m.MapFrom(s => s)); 

What is it. All 30 properties will be displayed by agreement:

 var service = new ServiceEntity { FirstName = "Sergey", LastName = "Berezovskiy", Salary = 5000, BkName = "Laziness in Action", BkDescription = "...", BkPrice = 42 }; var business = Mapper.Map<BusinessEntity>(source); var anotherService = Mapper.Map<ServiceEntity>(business); 

ORIGINAL RESPONSE Thus, you use a custom mapping, from the service object to the business object, then the default mapping will also not work for reverse mapping. You must manually provide mappings for members:

 Mapper.CreateMap<BusinessEntity, ServiceEntity>() .ForMember(d => d.FirstName, m => m.MapFrom(s => s.Details.NameFirst)) .ForMember(d => d.LastName, m => m.MapFrom(s => s.Details.LastName)) .ForMember(d => d.Salary, m => m.MapFrom(s => s.Details.Salary)) .ForMember(d => d.BkName, m => m.MapFrom(s => s.Details.BookDetails.BookName)) .ForMember(d => d.BkPrice, m => m.MapFrom(s => s.Details.BookDetails.BookPrice)) .ForMember(d => d.BkDescription, m => m.MapFrom(s => s.Details.BookDetails.BookDescription)); 

But I think that manual matching is better in this case, and then providing all of these cards for individual properties.