Question

I’m trying to bind a simple tree structure to an ItemsControl’s itemsSource in a Win 8 (formerly called) Metro app.
My structure implements the INotifyPropertyChanged interface, and also notify, when any of it’s children changed.

I tried to make a converter, which flatten my tree to an ObservableCollection, but after the binding created, it doesn’t refresh.

I made the following test project to show what I would like:
https://skydrive.live.com/redir?resid=970FFC53F4B7A598!146

The problem in this simple project, that if you press the Add button on the bottom app bar, it’s create a new child in the hierarchy, but the ListView does not refresh.

What I miss, or how can I do this?

Answer 1

This should be fairly simple using a DataTemplate, e.g.

<DataTemplate DataType="{x:Type local:TreeItemType}">
    <StackPanel>
        <ContentPresenter Content="{Binding Name}"/>
        <ItemsControl ItemsSource="{Binding Children}"/>
    <StackPanel>
<DataTemplate>

Apply it implicitly via the ItemsControl.Resources (so it gets applied to the inner ItemsControl as well.

---

If you just want the leaves or take issue with items not being single units you could construct a CompositeCollection, other than the converter which creates an ObservableCollection which is never modified because only the view has a reference to it, you can wrap the original collection via CollectionContainers, notifications will be preserved.