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problem with BBS & standart .NET grid

hector — Fri, 01 Mar 2013 21:07:54 GMT

Hi folks :

I have a problem with BBS & standart .NET grid.

I have 2 BO on a form ... Let Say ParentBO and ChildBO...

As the names implys one is parent and other is child.

I setup ParentRelationship and ParentBusinessObject properties of these BO's properly as i always do.

I also setup the BBS and grid as in SF Help document (Topic :Understanding the Business Binding Source (BBS) Control)

When I call ParentBO's Save I got a exception from SF's internal method PushDataToChildren.

When ı debug the problem i noticed that there is a one parent BO (ParentBO) but more then one child BO (which i never declared).

And these extra child BO's ParentRelationship was nothing...

This is first time I am using BBS...

When i worked on BBS deeply, I have also noticed that BBS ınternally, create an BO of same type for each row.

And I also noticed the problem is those Child BOs which internally added by BBS in SF.

Is this normal working logic of BBS?

Am i missing something in this picture?

Please advice ...

Kind regards...

RE: problem with BBS & standart .NET grid

hector — Fri, 01 Mar 2013 21:07:54 GMT

Problem is solved Ben...

Thanks a lot indeed

You are great:)

RE: problem with BBS & standart .NET grid

hector — Wed, 27 Feb 2013 20:09:24 GMT

You are right Ben..

I did so..

I will try your sugession and let u know...

Thanks a lot

RE: problem with BBS & standart .NET grid

StrataFrame Team — Wed, 27 Feb 2013 07:51:36 GMT

OK, I think I have an idea... the ParentRelationship is generally set through the type editor on the business object component editor. That means that the definition for the ParentRelationship gets put into the InitializeComponent() of the business object. Any time you create a new instance of the business object type, it should already have the ParentRelationship set. Are you setting the parent relationship a different way, such as setting it explicitly on the form?

To fix it, I can do a build for you or if you are comfortable with building the source yourself, the CreateShareAndAddBusinessObject() method needs to be changed to this:

Private Function CreateShareAndAddBusinessObject(ByVal index As Integer) As BusinessLayer

'-- Create a new object

Dim loReturn As BusinessLayer = CType(Activator.CreateInstance(Me._BusinessObject.GetType()), BusinessLayer)

'-- Share the table

Me._BusinessObject.ShareCurrentDataTable(loReturn)

'-- Set the parent relationship in case it was set on the business object explicitly outside of the constructor

If loReturn.ParentRelationship Is Nothing Then

loReturn.ParentRelationship = Me._BusinessObject.ParentRelationship

End If

'-- Set the parent business object of the instance object

loReturn.ParentBusinessObject = _BusinessObject.ParentBusinessObject

'-- Add the object to the list

Me._BusinessObjectList.Add(index, loReturn)

'-- Return the new object

Return loReturn

End Function

RE: problem with BBS & standart .NET grid

hector — Tue, 26 Feb 2013 01:26:44 GMT

Hi Ben,

As I can see the problem is here in this private method in ..\MicroFour StrataFrame Business\business\BusinessBindingSource.vb :

Private Function CreateShareAndAddBusinessObject(ByVal index As Integer) As BusinessLayer

'-- Create a new object

Dim loReturn As BusinessLayer = CType(Activator.CreateInstance(Me._BusinessObject.GetType()), BusinessLayer)

'-- Share the table

Me._BusinessObject.ShareCurrentDataTable(loReturn)

'-- Set the parent business object of the instance object

loReturn.ParentBusinessObject = _BusinessObject.ParentBusinessObject '->>>>>> In this line setting ParentBusinessObject increase ChildBusinessObjects collection and when parent BO calls save method there are lot of child BO to be save and their ParentRelationship property is nothing

'-- Add the object to the list

Me._BusinessObjectList.Add(index, loReturn)

'-- Return the new object

Return loReturn

End Function

Thanks Ben

RE: problem with BBS & standart .NET grid

Edhy Rijo — Mon, 25 Feb 2013 23:37:04 GMT

[quote][b]Ben Chase (2/25/2013)[/b][hr]... I'm sure you'll probably be one of our first beta users when we post it.[/quote]
Hi Ben,
Count me in, been waiting for SF2.0 for a long time<smile!!!>

RE: problem with BBS & standart .NET grid

StrataFrame Team — Mon, 25 Feb 2013 23:19:42 GMT

Nope, you're not missing anything from the picture. The foremost limitation of the SF BusinessObjects is that they are a single object that contains many actual records. One class and one instance contains multiple records, but the BO only talks to one record at a time. It was designed this way to be similar to the way some older programming languages work. However, with .NET, it's an issue because .NET expects collections for data sources, and a BO is only a single object. So, the BO has to try to act like both a single object and a group of objects as well. That's why we created the BBS. It wraps a BO and turns it into a collection of instances. They all share their internal data table behind the scenes so they each behave like they are the same business object, but each is pointed to a specific row. Since all of the children share the same internal DataTable, they don't all need to be children of the parent, just one of them does... the original one you linked up in your code. I'll have to take a look at this and see why the ParentBusinessObject reference is getting set on all of the child objects.

FYI, this was the first item on our list of enhancements for SFv2; separate objects and collections. We use an entity model with multiple classes instead of shoehorning all logic into one class: Entity, EntityCollection, EntityWinFormsView, EntityWpfView, EntityWebView, etc. I'm sure you'll probably be one of our first beta users when we post it.