How to populate a WPF TreeView node from a datasource?

Tue, 10 Oct 2006 21:21:06 Z

I'm having a question about populating a treeview control node.

Now, my problem is that I have a observableCollection that holds infrmation for subnodes that go into "Node1", and another observableCollection that holds information about subnodes that go into "Node2". Until runtime, I don't know which elements will be in the node1 nor how many of them will be... Does anyone know how can I bind the information from ObservableCollections to the nodes/subnodes?

Thanks in advance,
Marko Vuksanovic.

How to populate a WPF TreeView node from a datasource?

Wed, 11 Oct 2006 08:19:11 Z

Also an example of how to programatically populate a TreeView control would be very useful.......

How to populate a WPF TreeView node from a datasource?

Wed, 11 Oct 2006 08:29:22 Z

Did you try something like this

<Window.Resources>

</Window.Resources>

</TreeViewItem>

</TreeViewItem>

</TreeView>

How to populate a WPF TreeView node from a datasource?

Wed, 11 Oct 2006 08:47:51 Z

I have done the following:

<TreeViewItem Header="Sets" x:Name="SetsTreeViewItem" ItemsSource="{Binding Source={StaticResource PhotoSetCollectionDS}, Path=Title}">

But this does not populat the treeview node,.. it is empty,... If I populate a listbox from the above datasource it, the data is displayed correctly...

How to populate a WPF TreeView node from a datasource?

Wed, 11 Oct 2006 09:03:21 Z

It cannot find 'Title' property

try this

</DataTemplate>

<TreeViewItem Header="Sets"

ItemTemplate="{StaticResource dt}"

x:Name="SetsTreeViewItem" ItemsSource="{Binding Source={StaticResource PhotoSetCollectionDS}, Path=Title}">

How to populate a WPF TreeView node from a datasource?

Wed, 11 Oct 2006 09:05:14 Z

I also made sure that the datasource is not empty,... Still the data is not populated in the dataset.

Now I realized that there might be one more problem. If the dataset is empty and there are not treeview items to be put in a treeview node the node will not be possible to expand... What I would like to make is that the data is fetched from the internet once the treeviewnode is expanded. Is this possible with the treeview control?

How to populate a WPF TreeView node from a datasource?

Wed, 11 Oct 2006 09:06:19 Z

The title property is a property of my observable collection.... Did I do something wrong?

How to populate a WPF TreeView node from a datasource?

Wed, 11 Oct 2006 09:21:12 Z

if I understand correctly, source is a collection of some objects and Title is a property on the object right?

How to populate a WPF TreeView node from a datasource?

Wed, 11 Oct 2006 09:34:35 Z

That's right....

If I populate the a ListBox control using the following code it work.... But I would like this data (that is now in the listbox) to be in a treview node....

Now I would like to populate the data from the aboove DataObjectProvide into a treeView node... but cannot figure out a way...

How to populate a WPF TreeView node from a datasource?

Wed, 11 Oct 2006 09:36:02 Z

did you try setting the itemtemplate on the treeviewnode like I mentioned?

How to populate a WPF TreeView node from a datasource?

Wed, 11 Oct 2006 12:54:16 Z

Yes, I did and it did not work... i also made sure that the objectdataprovider/observable collection is not empty,.... I still cannot figure out a way to populate the treeview control...

How to populate a WPF TreeView node from a datasource?

Wed, 11 Oct 2006 13:02:17 Z

Do you see any Binding Errors in the output window

How to populate a WPF TreeView node from a datasource?

Wed, 11 Oct 2006 13:34:29 Z

No, there are no errors in the output.

I also tried using the same binding as I used for the listbox but... it populates the listbox but not the treeview control...

How to populate a WPF TreeView node from a datasource?

Wed, 11 Oct 2006 15:30:33 Z

You likely want to use a HierarchicalDataTemplate for the TreeView.ItemTemplate; the ItemsSource property on that template is what describes the nested collection to the TreeView.

I posted some examples here, and Bea has lots of other HierarchicalDataTemplates examples on her blog.