Hello, Although I have LLBLBEN for some time, I couldn´t find time to begin working with it, and now I am beginning with my first project. And as a newcomer I have some problems. My question is: For example I get an order entity with its related customer entity. Now, I select another customer and want to charge the order.Customer to the new customer selected.

 DataAccessAdapter adapter = new DataAccessAdapter(true);
 OrderEntity order = new ArticuloEntity(pkey);
 adapter.FetchEntity(order);
 order.Customer = 
  (CustomerEntity) adapter.FetchNewEntity(new CustomerEntityFactory(),   
          order.GetRelationInfoCustomer() );
 adapter.CloseConnection();
            
adapter.FechEntity(newCustomer);
order.Customer = newCustomer;

When I execute the last sentence I have an error like this

System.NullReferenceException : Object reference not set to an instance of an object.

in as DesetupSyncCustomer method.

How should I make something like this ?

I think this line is not completely correct:

 OrderEntity order = new ArticuloEntity(pkey);

Shouldn't that be:

 OrderEntity order = new OrderEntity(pkey);

?

When I try to reproduce what you're doing, it works ok, so I can't reproduce it:

[Test]
public void DereferenceTest()
{
    using(DataAccessAdapter adapter = new DataAccessAdapter())
    {
        OrderEntity o = new OrderEntity(10254);
        adapter.FetchEntity(o);
        o.Customer = (CustomerEntity)adapter.FetchNewEntity(new CustomerEntityFactory(), o.GetRelationInfoCustomer());

        CustomerEntity c = new CustomerEntity("BLONP");
        adapter.FetchEntity(c);
        o.Customer = c;
    }
}

Otis wrote:

I think this line is not completely correct:

 OrderEntity order = new ArticuloEntity(pkey);

Shouldn't that be:

 OrderEntity order = new OrderEntity(pkey);

?

Yes it should be. It was a mistake I made translating the name entity to a new one that I thought that better explain the relation of the objects.

But with the same test you have show me, translating the entity names. I have the same error

[Test]
public void DereferenceTest()
{
    using(DataAccessAdapter adapter = new DataAccessAdapter())
    {
        ArticuloEntity o = new ArticuloEntity(5);
        adapter.FetchEntity(o);
        o.Formato = (FormatoArticuloEntity)adapter.FetchNewEntity(new FormatoArticuloEntityFactory(), o.GetRelationInfoFormato());
        FormatoArticuloEntity c = new FormatoArticuloEntity(2);
        adapter.FetchEntity(c);
        o.Formato = c;
    }
}

Between Articulo and FormatoArticulo there is a (M:1) relation

The error is

ArticulosPublicitariosTest.Class1.DereferenceTest : System.NullReferenceException : Object reference not set to an instance of an object.

and the stack

at ArticulosPublicitarios.DAL.EntityClasses.ArticuloEntity.DesetupSyncFormato(Boolean signalRelatedEntity) in C:\PROYECTOS\ArticulosPublicitarios\DAL\DatabaseGeneric\EntityClasses\ArticuloEntity.cs:line 863

at ArticulosPublicitarios.DAL.EntityClasses.ArticuloEntity.SetupSyncFormato(IEntity2 relatedEntity) in C:\PROYECTOS\ArticulosPublicitarios\DAL\DatabaseGeneric\EntityClasses\ArticuloEntity.cs:line 876 at ArticulosPublicitarios.DAL.EntityClasses.ArticuloEntity.SetRelatedEntity(IEntity2 relatedEntity, String fieldName) in C:\PROYECTOS\ArticulosPublicitarios\DAL\DatabaseGeneric\EntityClasses\ArticuloEntity.cs:line 300 at SD.LLBLGen.Pro.ORMSupportClasses.EntityCollectionBase2.Add(IEntity2 entityToAdd) at ArticulosPublicitarios.DAL.EntityClasses.FormatoArticuloEntity.SetRelatedEntity(IEntity2 relatedEntity, String fieldName) in C:\PROYECTOS\ArticulosPublicitarios\DAL\DatabaseGeneric\EntityClasses\FormatoArticuloEntity.cs:line 232 at ArticulosPublicitarios.DAL.EntityClasses.ArticuloEntity.set_Formato(FormatoArticuloEntity value) in C:\PROYECTOS\ArticulosPublicitarios\DAL\DatabaseGeneric\EntityClasses\ArticuloEntity.cs:line 1483 at ArticulosPublicitariosTest.Class1.DereferenceTest() in c:\proyectos\articulospublicitarios\articulospublicitariostest\class1.cs:line 54

¿Maybe is it something I have bad designed in the llblgen project file?

OK, what's the version of llblgen pro you're using? (date in about box + version, as in: 1.0.2004.2 May 18th or so).

If you set a breakpoint in ArticuloEntity.DesetupSyncFormato, where exactly does it crash and what is null?

Otis wrote:

OK, what's the version of llblgen pro you're using? (date in about box + version, as in: 1.0.2004.2 May 18th or so).

If you set a breakpoint in ArticuloEntity.DesetupSyncFormato, where exactly does it crash and what is null?

The version is: Version 1.0.2004.2 May 1st, 2005

private void DesetupSyncFormato(bool signalRelatedEntity)
{
    if(_formato != null)
    {
                
        // disconnect the entity from this entity
        _formato.AfterSave-=new EventHandler(OnEntityAfterSave);
        if(signalRelatedEntity)
        {
            _formato.UnsetRelatedEntity(this, "Articulo");
        }
        base.UnsetEntitySyncInformation("Formato", _formato,   ArticuloEntity.Relations.FormatoArticuloEntityUsingFormatoArticuloId);
                
        _formato.DescripcionChanged-=new EventHandler(OnDescripcionFormatoChanged);
        _formato = null;
        SetNewFieldValue((int)ArticuloFieldIndex.FormatoArticuloId, null);
    }
}

The error appears at execution of the de-registration of the event handler

     _formato.DescripcionChanged-=new EventHandler(OnDescripcionFormatoChanged);

The indefined value is **_formato**

That line is a field mapped onto a related field. I don't have that in my test entities.

I'll try to fix this. It's a bug in the templates.

A fix for this is now available. Either download the templates archive from the templates section in the customer area, or download the full installer again. You've to regenerate your code after the template installation of course.

Frans, Thank you very much. You are an incredible man, I could never thought in a better support service than the one you give.