WPF: Programmatically select item in Treeview

[Thorsten Tarrach]

Hi,

unfortunately there does not seem to be a managed Newsgroup for WPF, so I
posted my question here:

In a databound Treeview I cannot access the TreeViewItems directly and the
SelectedItem property is real-only.
I can also not change the databound items it the backend to contain a
Selected property. This is because I bind against XML.

So, is there a simple way to programmatically traverse the TreeView and
select a specific item?

Thanks, Thorsten

 

[Colbert Zhou [MSFT]]

Hello Thorsten,

Thanks for using Microsoft Newsgroup Support Service, my name is Colbert
Zhou [MSFT] and I will be working on this issue with you.

We can use the ItemContainerGenerator.ContainerFromItem() to get the item's
UI TreeViewItem instance, and then we can use Reflection to call its Select
method. The following codes work fine in my side,
private void button1_Click(object sender, RoutedEventArgs e)
{
DependencyObject dObject =
this.treeView1.ItemContainerGenerator.ContainerFromItem(this.treeView1.Items
[1]);
((TreeViewItem)dObject).IsSelected = true;
MethodInfo selectMethod =
typeof(TreeViewItem).GetMethod("Select",BindingFlags.NonPublic |
BindingFlags.Instance);
selectMethod.Invoke(dObject, new object[] { true });
}

For detailed information, please see the following blog article which does
explain this topic,
http://askernest.com/archive/2008/01/23/how-to-programmatically-change-the-s
electeditem-in-a-wpf-treeview.aspx

Please let me know if this addresses your question. Any future assistance
we can provide, please feel free to contact me. Have a good day!


Best regards,
Colbert Zhou (colbertz @online.microsoft.com, remove 'online.')
Microsoft Online Community Support

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[Thorsten Tarrach]

Thanks, that was helpful indeed!