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Binding al ilis...

Binding al ilist on a grid

11/19/2007 7:55:41 PM

iwerner

6 posts

Binding al ilist on a grid

Hi,

I'm a newbi an ndo. I want to bind a ilist on a Janus Grid. i create a Ilist like

Dim query1 As Query = pm.NewQuery(GetType(kunden))

li = query1.Execute

The problem is now that ndo creates only a "read only list" for the child-objects. If it possible to create a a read-write Ilist to connect the grid on the list ?

Thanks Igor

11/20/2007 8:39:14 AM

Mirko

109 posts

Re: Binding al ilist on a grid

Hi Igor,

thanks for your interest in NDO. NDO can use any IList or IList<T> implementation for relations. So if the NDOReadOnlyGenericList doesn't fit your needs, just use a List<T>:

[NDOPersistent]
public class MyPersistentClass
{
    List<anotherPersistentClass> myRelation = new List<anotherPersistentClass>();
    List<anotherPersistentClass> MyRelation
    {
        get { return myRelation; }
        set { myRelation = value; }
    }
    ...
}

To propagate Add and Delete operations between the grid and the list, use the NDOBindingSource component instead of the BindingSource component of the .NET framework. You can install the NDO.Databinding.dll in the VS 2005 toolbox (right click into the toolbox and choose "Choose items..."). After that the component can be drawn from the toolbox into the designer window as usual. Or you edit the binding properties of your grid control in the normal way you did it before and rename the type of the BindingSource in the xxx.designer.cs file.

See also this sample.

If you have further questions, I'm glad to answer it.

Best Regards
Mirko

11/20/2007 1:25:28 PM

iwerner

6 posts

Re: Binding al ilist on a grid

Thanks Mirko..

my problem is to fill this a list with the chield objects if i use a other list and not the NDOReadOnlyGenericList.

Whaths the matter ?

<NDORelation(RelationInfo.Composite, "rolename")> Dim p_kontakte As List(Of kontakte) = New List(Of kontakte)()

Public Property Pkontakte() As IList(Of kontakte)

Get

Return New NDOReadOnlyGenericList(Of kontakte)(p_kontakte)

End Get

Set(ByVal Value As IList(Of kontakte))

p_kontakte = CType(Value, List(Of kontakte))

End Set

End Property

11/20/2007 1:38:18 PM

Mirko

109 posts

Re: Binding al ilist on a grid

Hi Igor,

NDO fills the list automatically as soon as it is touched. In your example it happens in the moment the variable p_kontakte in the accessor property is touched:

Public Property Pkontakte() As List(Of kontakte)

Get
Return p_kontakte // loads the child objects
End Get

Set(ByVal Value As IList(Of kontakte))
p_kontakte = value
End Set

End Property

Note: If you use DataBinding, there is no value in using the IList(of....) type instead of List(of....) .

Best Regards
Mirko

11/22/2007 9:15:23 AM

iwerner

6 posts

Re: Binding al ilist on a grid

Thanks it works :)

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NDO-Forum postings in english please, if possible.

Developing with NDO

Binding al ilis...