How to access an edit box which is a Datatemplate of a TreeItem

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Hi,

I have below situation

Have a DataTemplate like below

XML

<DataTemplate x:Key="editableName">
    <TextBox x:Name="hTreeRenameBox" />
</DataTemplate>

Have a treeview like below

XML

<TreeView x:Name="hScExTrview" BorderBrush="Brown" Background="#FF1E1E1E" BorderThickness="1" Margin="0,-1,-1,0" ToolTip="Session Scripts">
</TreeView>

Now I have created some TreeItems for the treeview from Code.

One point I have selected one context menu which is part of the treeview and I have the below code to add the DataTemplate with TreeView Item like below

TreeViewItem pp = (TreeViewItem)hScExTrview.SelectedItem;
String kk = (String)pp.Header;
pp.HeaderTemplate = (DataTemplate)this.Resources["editableName"];

Now my query is I want to get "hTreeRenameBox" which is declared inside DataTemplate. How I can get that from the above C# code.

I used the below code but it is not working; kindly correct me!
TextBox textBoxAnswer = pp.HeaderTemplate.FindName("hTreeRenameBox",pp) as TextBox;

Posted 28-Apr-15 2:15am

Toufique Samim

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johannesnestler 30-Apr-15 8:39am

did you solve it?

1 solution

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johannesnestler · Answer 1 · 2015-04-28T05:38:00

Hi Toufique.

You could use FrameworkTemplate's Find method to get a named element from a template.

In your case you have a "Problem" because the Header is in the default TreeViewItem ControlTemplate represented by a ContentPresenter like this:

XML

<ContentPresenter x:Name="PART_Header" ContentSource="Header" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>

So the solution could work like this:

C#

// Get the HeaderTemplate used by the TreeViewItem
FrameworkTemplate ft = pp.HeaderTemplate;
// Get the FrameworkElement your Template is applied to - it's the ContentPresenter from your TreeViewItem Template (if you haven't overriden it..)
ContentPresenter presenterHeader = pp.Template.FindName("PART_Header", pp) as ContentPresenter;
// Now we can find the elements of the Template from the FrameworkElement it was applied to (the ContentPresenter)
TextBox obj = ft.FindName("hTreeRenameBox", presenterHeader ) as TextBox;

Kind regards Johannes

P.S. maybe try a proper MVVM pattern implementation with your WPF Project, and get rid of your code-behind and such "problems"?