Automapper create map from custom method

Question

I have the following classes:

public class Entity
{
      public string Name { get; set; }
}       
public class SomethingDto
{
     public string NameChanged { get; set; }
     public void Mapping(Entity something)
     {
         NameChanged = something.Name;
     }          
}

I want to use the Mapping Method of the DTO to create the map as the following way:

conf.CreateMap<Entity, SomethingDto>().ForMember(t => t.NameChanged, opt => opt.MapFrom(t => t.Name));

There is a way in AutoMapper to create the maps with custom methods, who works with his projection?

You can have a constructor instead. The docs.

Lucian Bargaoanu
– Lucian Bargaoanu

2017-08-27 04:56:23 +00:00
Commented Aug 27, 2017 at 4:56 — Lucian Bargaoanu
– Lucian Bargaoanu, Commented Aug 27, 2017 at 4:56

Ken Bonny · Accepted Answer · 2018-01-26 11:17:34Z

You don't want to do it like that, because that makes the DTO aware of the entity and that would throw out the separation you'd get.

Now in this case, the line ForMember(t => t.NameChanged, opt => opt.MapFrom(t => t.Name)) will work because Name and NameChanged are both of type string. Say you'd like to do something along the lines of mapping identifier of type string with value '20180120-00123456' to two properties on the destination: a DateTime property and a ProductId property. You can do this two ways.

Simple

You would write two mapping functions in the class where you make the mapping and do it along the lines of:

ForMember(t => t.Date, opt => opt.MapFrom(t => RetrieveDate(t.Identifier)))
ForMember(t => t.ProductId, opt => opt.MapFrom(t => RetrieveProductId(t.Identifier)))

Complex

You would make a custom class OrderIdentifier (now I'm assuming the identifier is for an order) with only the Id property as string. Then you'd make two custom type converters, like the article describes.

Collectives™ on Stack Overflow

Automapper create map from custom method

1 Answer 1

Simple

Complex

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Simple

Complex

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related