How to get TreeViewItem from HierarchicalDataTemplate item?

Question

I have a TreeView which uses a HierarchicalDataTemplate to bind its data.

It looks like this:

Answer 1

I modified William's recursive search to a more compact version:

public TreeViewItem GetTreeViewItemFromObject(ItemContainerGenerator container, object targetObject) {
    if (container.ContainerFromItem(targetObject) is TreeViewItem target) return target;
    for (int i = 0; i < container.Items.Count; i++)
        if ((container.ContainerFromIndex(i) as TreeViewItem)?.ItemContainerGenerator is ItemContainerGenerator childContainer)
            if (GetTreeViewItemFromObject(childContainer, targetObject) is TreeViewItem childTarget) return childTarget;
    return null;
}

One would call it by providing the TreeView instance's ItemContainerGenerator and the target data object:

TreeViewItem tvi = GetTreeViewItemFromObject(treeView.ItemContainerGenerator, targetDataObject);