Have element of differents types in a recursive tree?

[Julien]

Hi!

I've to create a tree that represent Files and Folder.

my actual structure is:

Folder object has
-->SubFolder ObservableCollection
-->File List (observablecollection too)

I need to have in the same tree files and folder.

I've no problem creating a treee browsing Folders:

<Grid>
    <Grid.RowDefinitions>
        <RowDefinition Height="*"/>
    </Grid.RowDefinitions>
    <Grid.Resources>
        <HierarchicalDataTemplate x:Key="NodeTemplate" ItemsSource="{Binding SubFolders}">
            <TextBlock Text="{Binding Name}"/>
        </HierarchicalDataTemplate>
    </Grid.Resources>
    <telerik:RadTreeView Name="uxRadTreeView" ItemsSource="{Binding RootFolder.SubFolders}" ItemTemplate="{StaticResource NodeTemplate}" AllowDrop="False" IsDragDropEnabled="True" DragEnded="uxRadTreeView_DragEnded" />
</Grid>

But how can I get files with that too?

They both have a "Name" property

[Hristo]

Hello Julien,

You just need to create an additional property (AllItems of type ObservableCollection) that contains both files and folders lists and use that property in the data binding.

<HierarchicalDataTemplate x:Key="NodeTemplate" ItemsSource="{Binding AllItems}">
    <TextBlock Text="{Binding Name}"/>
</HierarchicalDataTemplate>

Also, you can use ItemTemplateSelector property of the RadTreeView instead of using ItemTemplate. This way you will be able to apply different data templates to different items in the tree based on custom logic. I'm attaching a sample project demonstrating what I mean.

Kind regards,
Hristo Milyakov
the Telerik team

[Julien]

But I've to maintain updated theses two properties,

And I can't open the ExpressionTree, I got a strange error: C:\Users\julien\Desktop\test\ExpressionTree\ExpressionTree.csproj : error  : Unable to read the project file 'ExpressionTree.csproj'. 

ExpressionTree.Web hasn't this problem

[Hristo]

Hello Julien,

Yes, you have to maintain the collections synchronized.

The project I sent you was a Silverlight project I've attached by mistake. You can take a look at the following attachment, which is a WPF project using framework version 3.5.

Greetings,
Hristo Milyakov
the Telerik team