RIA: Loading entity sets

Question

I am missing something very fundamental when working with SL4 RIA entities. I have a Domain Service with User entities. On the service context, I have a method:

EntityQuery<User> GetUsersQuery()

I perform a load like so:

context.Load(context.GetUsersQuery(), (loadOp)=> 
{
  // Things done when the load is completed
}, null);

When the Completed action executes, the loadOp.Entities collection is full of the User entities, but they are not attached to the context.Users entity set. It also appears that I can't attach them manually from the callback. What important step am I missing to get these tracked in the entity set?

---

Just to elaborate, in the completed handler, I tried:

foreach (var user in loadOp.Entities)
    context.Users.Attach(user);

And I get an exception that says an entity with that name is already attached. Yet, both context.Users and context.EntityContainer are empty.

Answer 1

Are you sure you are using the same instance of the context in all cases? What does context.EntityContainer.GetEntitySet<User>().Count say?

Does LoadOperation<User>.HasError return true? If so, what is the error?