Creating Person Entity
We define entities in .Core (domain) project (in server side). We can define a Person entity (mapped to PbPersons table in database) to represent a person in phone book as shown below (I created in a new folder/namespace named PhoneBook):
Person's primary key type is int (as default). It inherits FullAuditedEntity that contains creation, modification and deletion audit properties. It's also soft-delete. When we delete a person, it's not deleted by database but marked as deleted (see entity and data filters documentations for more information). We created consts for MaxLength properties. This is a good practice since we will use same values later.
We add a DbSet property for Person entity to PhoneBookDemoDbContext class defined in .EntityFrameworkCore project.