WPF TreeView 後台C#選中指定的Item， 需要遍曆

          private TreeViewItem FindTreeViewItem(ItemsControl container, object item)        {            if (null == container || null == item)            {                return null;            }
            if (container.DataContext == item)            {                return container as TreeViewItem;            }
            int count = container.Items.Count;            for (int i = 0; i < count; i++)            {                TreeViewItem subContainer = (TreeViewItem)container.ItemContainerGenerator.ContainerFromIndex(i);
                if (null == subContainer)                {                    continue;                }
                // Search the next level for the object.                TreeViewItem resultContainer = FindTreeViewItem(subContainer, item);                if (null != resultContainer)                {                    return resultContainer;                }            }
            return null;        }


/////使用上述方法遍曆 ， 然後設定IsSelected屬性
   private static void SelectedItemChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)        {            //            SelectedProtocolControl spc = d as SelectedProtocolControl;
            if (null != spc)            {                if (e.NewValue != spc.trvSelectedProtocol.SelectedItem)                {                    //TreeViewItem tviNew = spc.trvSelectedProtocol.ItemContainerGenerator.ContainerFromItem(e.NewValue) as TreeViewItem;                    TreeViewItem tviNew = spc.FindTreeViewItem(spc.trvSelectedProtocol, e.NewValue);                    if (null != tviNew)                    {                        tviNew.IsSelected = true;                    }                }
                if (null != e.OldValue)                {                    //TreeViewItem tviOld = spc.trvSelectedProtocol.ItemContainerGenerator.ContainerFromItem(e.OldValue) as TreeViewItem;                    TreeViewItem tviOld = spc.FindTreeViewItem(spc.trvSelectedProtocol, e.OldValue);                    if (null != tviOld)                    {                        tviOld.IsSelected = false;                    }                }            }
            System.Diagnostics.Debug.WriteLine("SelectedItemChanged...");        }