Use ObjectDataSource in hierarchy

[Jeremy Deckard]

I have  generic List of objects (pages) each on has an ID and ParentID in an ObjectDataSource.  I have set the appropriate properties in the treeview but  all I get is a single level list not  a hierarchy as expected.

    <telerik:RadTreeView ID="RadTreeView1" runat="server" Skin="Vista" DataSourceID="dsPages" DataFieldID="PageID" DataFieldParentID="ParentPageID" DataTextField="Name" DataValueField="PageID" />

[Veselin Vasilev]

Hi Jeremy Deckard,

Thank you for contacting Telerik Support!

Binding RadTreeView to a data source that implements IEnumerable, such as Array or ArrayList, creates a flat data structure. Only root items are created and there is no hierarchy.

More detailed information is available here: Binding to Array, ArrayList and Generic List

I believe that these two links will help you too:

• Code Library - r.a.d TreeView Binding using HierarchicalDataSourceControl Class and Custom Business Objects Collections
• Forum thread - TreeView Binding to Business

I hope this helps.

Sincerely yours,
Veskoni
the Telerik team

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[Jason Clark]

Just an FYI, there is a more elegant way than the code sample posted by Telerik:

http://elegantcode.com/2008/04/06/aspnet-hierarchicaldatasourcet/

Only change that I found was in his HierarchyData class you need a property called name which returns  the name of the data item.   Now you have a generic way to deal with this problem.

Perhaps Telerik could post this instead/along with the other example, since this is much more reusable.

Cheers