Why can't I do ToList()? - entity-framework

Question

I build a model as below. The relationship between Recycler and Account is 1:1.
public class MyContext : DbContext
{
public DbSet<Quoter> Quoters { get; set; }
public DbSet<Account> Accounts { get; set; }
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Entity<Account>()
.HasRequired(a => a.RecyclerRef)
.WithRequiredDependent(r => r.AccountRef);
}
}
public class Quoter
{
public int QuoterId { get; set; }
public string Text { get; set; }
}
public class Recycler : Quoter
{
public string Description { get; set; }
public virtual Account AccountRef { get; set; }
}
public class Account
{
public int AccountId { get; set; }
public Recycler RecyclerRef { get; set; }
}
But, I get exceptions when I do the either of these queries:
var query1 = context.Quoters
.OfType<Recycler>()
.Include(r => r.AccountRef)
.Where(r => r.QuoterId == 1)
.ToList();
var query2 = context.Set<Recycler>()
.Include(r => r.AccountRef)
.Where(r => r.QuoterId == 1)
.ToList();
Exception shows that ResultType is “Transient.reference[POCOFirst.Quoter]”，but recommanded is “Transient.reference[POCOFirst.Recycler]”
If I remove the ToList(), it works well. But I need a list as the return value of method.
Why can't I do ToList()? Thanks

Answer 1

It looks like you have stumble upon this bug in EF. Another reference to the bug.
Workaround would be to remove the Include method.