Is it possible to create a mapping class in Entity Framework Core?

Question

In previous versions of Entity Framework we could use EntityTypeConfiguration<TEntity> to configure the mapping for the entity of type TEntity on the constructor.

The other option is to set the mapping on the OnModelCreating method of the DbContext , but this other option is nice because we can leave each mapping in its own place.

Now I'm starting to use Entity Framework Core and I could not find the EntityTypeConfiguration<TEntity> class, so I believe things have changed.

Is it possible to create a mapping class in the new version of Entity Framework or for now we have to use the OnModelCreating ?

Answer 1

Unfortunately, OnModelCreating is the preferred way to do it right now. The team (specifically rowanmiller) mentioned that:

I think we will probably do this, or something like it, but it is lower priority than some of the other features EF Core is missing at the moment.

https://github.com/aspnet/EntityFramework/issues/2805

If you read through the comments on that issue, there are some alternative ways to do it, but not "officially" supported ways other than OnModelCreating right now.