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In which layer should contain AutoMapper configurations?
AutoMapper is to map ViewModels to my Domain Entities.
I have three layers in my app: Domain, UI (MVC), Infrastructure.
It should live in the top most layer that it is translating to/from.
If you have mappers between domain and infra, then they should live in domain (assuming that uses infra).
If you have mappers between UI and domain, then they should live in UI (assuming that uses domain).
This means that the lower down layers do not know or need to know about the layers higher up.