A TreeView, a HierarchicalDataTemplate, and a 2D collection walk into a bar ...

re: A TreeView, a HierarchicalDataTemplate, and a 2D collection walk into a bar ...

zajda82 — Thu, 08 Mar 2007 11:58:06 GMT

Is there any way of binding some TreeCollection to WPF TreeView? If we dont know how many levels this collection will have?

re: A TreeView, a HierarchicalDataTemplate, and a 2D collection walk into a bar ...

MikeHillberg — Tue, 01 May 2007 01:59:38 GMT

Re: "Is there any way of binding some TreeCollection to WPF TreeView? If we dont know how many levels this collection will have?"

Yes, TreeView expands to any depth. If you look at the ItemTemplate for the TreeView above, you see it is a HierarchicalDataTemplate with an ItemsSource:

That ItemsSource property explains how, at each level of the tree view, to find the next level.

This post from Bea (http://www.beacosta.com/2006/02/how-do-i-display-grouped-data-in.html) and this from Karsten (http://blogs.msdn.com/karstenj/archive/2005/11/02/488420.aspx) have more info on TreeView and HierarchicalDataTemplate.

re: A TreeView, a HierarchicalDataTemplate, and a 2D collection walk into a bar ...

kidsysco — Mon, 02 Jul 2007 15:30:47 GMT

Could not get the example to work, it does not care for the DataTemplate tag nested in the HeirarchicalDataTemplate.ItemTemplate tag.

Was this example tested?

re: A TreeView, a HierarchicalDataTemplate, and a 2D collection walk into a bar ...

kidsysco — Thu, 05 Jul 2007 14:33:57 GMT

OK I got this example to build. I think that it is important to deliver folks at least a little info on the namespace delcared at the top of the XAML file. I do have a fundamental understanding of WPF and I can manage to get alot done with it but I did not realize that the XAML needs a reference to the namespace that it is operating in. I guess that just sounds weird to me and I do not quite understand why. I will go ahead and read those sections of the WPF spec again to see if I can figure out why.

xmlns:local="clr-namespace:HierarchicalDataTemplateTest"

I had to change that line to ...

xmlns:local="clr-namespace:myNameSpaceForThisXamlFile"

Thanks for your help Mike!

re: Could not get the example to work

MikeHillberg — Thu, 05 Jul 2007 20:19:03 GMT

Sorry kidsysco, you're right; I should have called that out and included the namespace in the .cs part of the sample. I've updated it now.

Thanks for posting the comment!

Load a Treeview on Demand ...

Remora — Mon, 17 Sep 2007 17:35:35 GMT

I try hard to load data only when user click on leaf.

I have succeeded in creating Treeview data in one shot but data are very heavy to load and I'd like to go down in tree only when needed ...

Ideas guys ?

Thanks

Eric

re: A TreeView, a HierarchicalDataTemplate, and a 2D collection walk into a bar ...

anildhan — Fri, 05 Oct 2007 10:39:06 GMT

Hello Mike,

How do we design HierarchicalDataTemplate for nested collections.

For example

The above stuff is just a raw example.

But we can have objects of same types nested inside each other.

for example,

Node having list of Nodes.

Could you please help on this.

Regards