[Solved] Lazy-Loading

[Thorsten]

Hi,

i've got a question regarding the way openaccess handles lazy loading:

Lets say i've got the following entities:

public class Customer
{
   string Name {get; set;}
   IList<RentalOrders> RentalOrders {get;set;}
}
public class RentalOrder
{
...
}

and the following method:

public void WriteCustomer( Customer customer )
{
   ...
}

I'd like to write out the currently available properties (including the navigation properties, if loaded) of the customer entity without triggering any lazy-load calls.
But when the method gets called, i know nothing about the customer's origin.
Hence i don't know if the Property "RentalOrders" has been included via a fetchstrategy/include or not.

Is there a way to detect if navigation property X for entity Y on instance Z has been loaded or not ?

So far what i've come up with, doesn't really get me where i want to be:

var mgr = customer.OpenAccessEnhancedGetPersistenceManager();
if (mgr != null)
{
      var scope = mgr.getUserObject() as IExtendedObjectScope;
      if (scope != null)
      {
             var omg = new ArrayList(1);
             omg.Add(customer);
             scope.CreateDetachedCopies( omg, null );
             customer= omg[0];
      }
}

The snippet above avoids any Lazy-Load call, but i loose any previously loaded navigation property.

Thanks in advance.

Kind regards,

Thorsten Klingert

[Thorsten]

Hi again,

this one can be closed, i've found a solution for it:

PersistenceCapable entity
IPersistenceManager mgr = entity.OpenAccessEnhancedGetPersistenceManager( );
if (mgr != null)
{
    var scope = mgr.getUserObject( ) as IObjectScope;
    if (scope != null)
    {
         var notYetLoadedMembers = scope.GetMemberNames( entity, ObjectState.NotLoaded );
         ....
    }
}

[Damyan Bogoev]

Hello Thorsten,

I am glad to see that you have managed to find a solution to this problem.

Do not hesitate to contact us if you face further trouble.

All the best,
Damyan Bogoev
the Telerik team