AutoMapper Map Child Property that also has a map defined

Question

I have the following Domain Object:

public class DomainClass {     public int Id { get; set; }      public string A { get; set; }     public string B { get; set; } } 

I have the following two objects that I want to map to:

public class Parent  {     public int Id { get; set; }     public string A { get; set; }      public Child Child { get; set; } }  public class Child  {     public int Id { get; set; }     public string B { get; set; } } 

I set up the following maps:

 Mapper.CreateMap<DomainClass, Parent>();  Mapper.CreateMap<DomainClass, Child>(); 

If I map my object using the following call then the parent.Child property is null.

var domain = GetDomainObject(); var parent = Mapper.Map<DomainClass, Parent>(domain); // parent.Child is null 

I know I can write the following:

var domain = GetDomainObject(); var parent = Mapper.Map<DomainClass, Parent>(domain); parent.Child = Mapper.Map<DomainClass, Child>(domain); 

Is there a way I can eliminate that second call and have AutoMapper do this for me?

Answer 1

You just need to specify that in the mapping:

Mapper.CreateMap<DomainClass, Child>(); Mapper.CreateMap<DomainClass, Parent>()       .ForMember(d => d.Id, opt => opt.MapFrom(s => s.Id))       .ForMember(d => d.A, opt => opt.MapFrom(s => s.A))       .ForMember(d => d.Child,                   opt => opt.MapFrom(s => Mapper.Map<DomainClass, Child>(s)));