Build a hierachy from a flat list ?

[Michael]

Is it possible to create a hierarchical tree list view from a flat list, much in the way you can with a TreeList ( http://docs.telerik.com/devtools/wpf/controls/radtreeview/how-to/bind-to-self-referencing-data.html ) ?

We have a data structure where the objects have the ids of their parents, and we would much rather bind to a flat list, than rebuild the hierarchy.

I had a look at the hierarchical grid view (http://docs.telerik.com/devtools/wpf/controls/radgridview/hierarchical-gridview/self-referencing-grid.html ), but that still seems to put children at the top level (as well as the child level).

 

[Michael]

I've tried the following xaml :

<telerik:RadTreeListView.ChildTableDefinitions>
                <telerik:TreeListViewTableDefinition>
                    <telerik:TreeListViewTableDefinition.Relation>
                        <telerik:TableRelation IsSelfReference="True">
                            <telerik:TableRelation.FieldNames>
                                <telerik:FieldDescriptorNamePair
                                    ParentFieldDescriptorName="Id"
                                    ChildFieldDescriptorName="ParentId" />
                           </telerik:TableRelation.FieldNames>
                        </telerik:TableRelation>
                    </telerik:TreeListViewTableDefinition.Relation>
                </telerik:TreeListViewTableDefinition>
            </telerik:RadTreeListView.ChildTableDefinitions>

But all I get is a flat list.

The model looks like this :

public class Item
{
    public string Id {get; set;}
    public string ParentId {get; set;}
}

Where ParentId is null if the item is a top level item.

[Stefan]

Hi Michael,

Can you please take a look at the Self reference with tree list view forum thread, as this topic is already discussed in it?

Hope it helps.

Best Regards,
Stefan X1
Telerik

[Michael]

No - that doesn't help. It suggests using a grid view instead of a tree list view.

I found a post elsewhere (http://www.telerik.com/forums/treelistview-and-self-referencing-data-source) where this was raised, and a solution presented, which is what I've shown in the above xaml.

[Stefan]

Hello Michael,

Upon further investigation, it seems that using RadTreeListView for a self-referenced data source is not supported. Please excuse me for misguiding you.

For such scenario, I can suggest you using RadGridView with a RadTreeListView structure, as demonstrated in this forum thread.

I hope it works for you.

Best Regards,
Stefan X1
Telerik