AutoMapper: Does Map <A,B> give <B,A>?

Question

Using Automapper I create a simple map:

Mapper.CreateMap<MyCustomerDTO, YourCustomerDTO>()

I often need to go the other way too. Do I need to also create the mapping the other way, or will Automapper infer it based on the above mapping?

Mapper.CreateMap<YourCustomerDTO, MyCustomerDTO>()   //Needed?

Answer 1

This is a duplicate to Do i need to create automapper createmap both ways?

Note the answer regarding .ReverseMap() here.

Note that .ReverseMap() is for basic mapping. If you need to use options (such as specific ForMember mappings), you will need to create a custom reverse map.

Answer 2

No. you must create two way mapping. A good helper method for two way mapping could be :

 protected virtual void ViceVersa<T1, T2>()
        {
            Mapper.CreateMap<T1, T2>();
            Mapper.CreateMap<T2, T1>();
        }

then use it like this :

ViceVersa<T1, T2>();