Automapper mapping to properties from a nested object [duplicate] - asp.net-core

Question

I am trying to map a result I get from database and I have the following models
public class ClientTest
{
public int Id { get; set; }
public string Name { get; set; }
}
public class ClientTestDto
{
public int Id { get; set; }
public string Name { get; set; }
}
public class ClientDbItem
{
public ClientTest Client { get; set; }
public Address Address { get; set; }
}
public class Address
{
public int Id { get; set; }
public string Value { get; set; }
}
and the following mapping
CreateMap<ClientTest, ClientTestDto>();
CreateMap<ClientDbItem, ClientTestDto>()
.ForMember(dest => dest, opt => opt.MapFrom(src => src.Client));
When I run the software I get
Custom configuration for members is only supported for top-level
individual members on a type
Why is that happening If I am creating the config for ClientTest and ClientTestDto first?

Answer 1

There's a special API for that, IncludeMembers. See here.

Answer 2

This error might also arise when you try to map the top-level element to a constructor:
.ForMember(dest => dest, opt => opt.MapFrom(
src => new B1(src.Prop3, src.Prop4)));
Instead of mapping the top-level element MEMBER to the constructor (which works fine):
.ForMember(dest => dest.MyProperty, opt => opt.MapFrom(
src => new B1(src.Prop3, src.Prop4)));
To avoid this, use .ForCtorParam
Example:
CreateMap<Source, DestinationWithConstructor>()
.ForCtorParam("code", opt => opt.MapFrom(src => src.Prop3))
.ForCtorParam("text", opt => opt.MapFrom(src => src.Prop4))