how to insert a child item in a treeview C# WPF

Question

I want to add a child item in a TreeViewItem that was added previously. The problem with code like this:

How to insert a child node in a TreeView Control in WPF?

Answer 1

Maybe you forgot the tags? If you have the following in your xaml file:

    
        Hello
        World
    

And the following in the code-behind:

var a = MyTreeView.Items.GetItemAt(0) as string;
var b = MyTreeView.Items.GetItemAt(0) as TreeViewItem;
var c = MyTreeView.Items.GetItemAt(1) as string;
var d = MyTreeView.Items.GetItemAt(1) as TreeViewItem;

Variables a and d will be null whereas b will be a TreeViewItem and c will be a string.