Question

I have this object:

public class Profile
{
     public int Id {get;set;}
     public List<User> Users {get;set;}
}

and I have a page to delete profiles.. so I want to delete a profile if there is not users related..

I tried this:

var profile = _db.Profile
.Include(p => p.Users)
.SingleOrDefault(p => p.Id == id);

_db.Profile.Remove(profile);
_db.SaveChanges();

but this automatically delete all users related(I don’t undestand why since I don’t set any especial configuration for that).

How can I avoid this?
How can I get a exception when I try to SaveChanges?

I would love to avoid checking the Users.Count directly in my code to do it.

Answer 1

you can use the extension method

.WillCascadeOnDelete(false);

for a specific relation,

or disable all delete cascade with the OneToManyCascadeDeleteConvention

protected override void OnModelCreating(System.Data.Entity.ModelConfiguration.ModelBuilder modelBuilder)

    {
        modelBuilder.Conventions.Remove<OneToManyCascadeDeleteConvention>();
   }

This will show you some more details (EF 4 CTP5, but should be valuable)