Question

I have the following class hierarchy:

public class RealPeople { }

public class Users : RealPeople { }
public class People : RealPeople { }

In my dbContext, I defined a dbSet for RealPeople and on the OnModelCreating procedure, I specified separated tables for People and Users:

modelBuilder.Entity<Users>().ToTable("Users");
modelBuilder.Entity<People>().ToTable("People");

This creates the corresponding full hierarchy in my DB, with the 3 corresponding tables.
The problem comes when I want to retrieve the list of Users in my DB.
This:

List = (from Reg in PersistentMgr.RealPeople select (Users)Reg)
       .ToList();

or this:

List = (from Reg in PersistentMgr.RealPeople select (Users)((RealPeople)Reg))
       .ToList();

Throws an exception:

LINQ only being able to cast primitive model types.

So the thing is, I can’t cast RealPeople to the corresponding subclass Users.
Any ideas on this one?

Answer 1

The way to get a collection of subclasses is using OfType:

var users = (from p in PersistentMgr.RealPeople select p).OfType<User>();