In this blog we will learn how to clear/deselect selected items in TreeView while working on a WPF application. There following scenarios need to be considered before coming up for a solution to the problem:

1) The TreeView is bound  to a SelectedItem which is itself an item of a binded collection.
2) There are multiple levels of ItemContainerGenerator which may  contain deeper level objects

To solve the above problem we will loop recursively through the whole TreeView  and set the IsSelected property to false.  Following is a class that implements the logic to deselect the items.

   // This class is used for clearing selection in treeView
    class ClearTreeSelection
    {
        public static void ClearTreeViewSelection(TreeView tview)
        {
            if (tview != null)
                ClearTreeViewItemsControlSelection(tview.Items, tview.ItemContainerGenerator);
        }
        private static void ClearTreeViewItemsControlSelection(ItemCollection ic, ItemContainerGenerator icg)
        {
            if ((ic != null) && (icg != null))
                for (int i = 0; i < ic.Count; i++)
                {
                    // Get the TreeViewItem
                    TreeViewItem tvi = icg.ContainerFromIndex(i) as TreeViewItem;
                    if (tvi != null)
                    {
                        //Recursive call to traverse deeper levels
                        ClearTreeViewItemsControlSelection(tvi.Items, tvi.ItemContainerGenerator);
                        //Deselect the TreeViewItem 
                        tvi.IsSelected = false;
                    }
                }
        }
    }

Hope the above blog helped in solving a common problem encountered in working with TreeView in a WPF application.