How to create DbSet for ignored entity

问题

I need to create DbSet for my ignored entity. Now I have in my modelBuilder next code:

modelBuilder.Ignore<ExtendedDepartment>();

And inside my DbSet I have:

public DbSet<ExtendedDepartment> ExtendedDepartments { get; set; }

When I`m trying to get data from that Dbset I have error:

InvalidOperationException: Cannot create a DbSet for ExtendedDepartment because this type is not included in the model for the context.

So I am trying to ignore this table in migration, maybe I am doing smthing wrong.

来源：https://stackoverflow.com/questions/49136316/how-to-create-dbset-for-ignored-entity