Question

I’m searching for a linq-to-objects way to get a TreeViewItem from a treeView.

I want to do something like this:

var node =             from TreeViewItem childs in tree.Items             where  ((int) childs.Tag) == 1000                select childs;   string tag = ((TreeViewItem)node).Tag.ToString(); 

Then I want to append children to this node.

Thanks.

Answer 1

You’ll want to use FirstOrDefault to extract the first matching element from the enumeration created by the query. After checking that it’s not null, you can then operate on it like you normally would.

 var query =         from TreeViewItem childs in tree.Items         where  ((int) childs.Tag) == 1000            select childs;   var node = query.FirstOrDefault();   if (node != null)  {     ...  } 

Note that you won’t need the cast any longer since FirstOrDefault will return a TreeViewItem.