How to programmatically select an item in a WPF TreeView?

Question

How is it possible to programmatically select an item in a WPF TreeView? The ItemsControl model seems to prevent it.

Answer 1

For those who are still looking for the right solution to this problem here is the one below. I found this one in the comments to the Code Project article “WPF TreeView Selection” http://www.codeproject.com/KB/WPF/TreeView_SelectionWPF.aspx by DaWanderer. It was posted by Kenrae on Nov 25 2008. This worked great for me. Thanks Kenrae!

Here is his post:

Instead of walking the tree, have your own data object have the IsSelected property (and I recommend the IsExpanded property too). Define a style for the TreeViewItems of the tree using the ItemContainerStyle property on the TreeView that binds those properties from the TreeViewItem to your data objects. Something like this:

<Style x:Key="LibraryTreeViewItemStyle"                TargetType="{x:Type TreeViewItem}">             <Setter Property="IsExpanded"                         Value="{Binding IsExpanded, Mode=TwoWay}" />             <Setter Property="IsSelected"                         Value="{Binding IsSelected, Mode=TwoWay}" />             <Setter Property="FontWeight"                         Value="Normal" />             <Style.Triggers>                   <Trigger Property="IsSelected"                               Value="True">                         <Setter Property="FontWeight"                                     Value="Bold" />                   </Trigger>             </Style.Triggers>       </Style>  <TreeView ItemsSource="{Binding Path=YourCollection}"                ItemContainerStyle="{StaticResource LibraryTreeViewItemStyle}"                ItemTemplate={StaticResource YourHierarchicalDataTemplate}/> 

Answer 2

It's a real pain for some strange reason, you have to use ContainerFromItem to get the container, then invoke the select method.

//  selectedItemObject is not a TreeViewItem, but an item from the collection that  //  populated the TreeView.  var tvi = treeView.ItemContainerGenerator.ContainerFromItem(selectedItemObject)            as TreeViewItem;  if (tvi != null) {     tvi.IsSelected = true; } 

There once was a blog entry on how to do it here, but the link is dead now.