TreeViewItem的顺序调整（WPF）

 DataTable dt = new DataTable();
            DataColumn dc = new DataColumn()
            {
                ColumnName = "Name",
            };
            dt.Columns.Add(dc);
            for (int i = 0; i < 5; i++)
            {
                DataRow dr = dt.NewRow();
                dr[0] = "节点" + i;
                dt.Rows.Add(dr);
            }
            
            foreach (DataRow row in dt.Rows)
            {
                List.Add(new EntityTreeModel() { Name = row[0].ToString() });
            }
          
            this.tvListDataTable.ItemsSource = List;



private void tvListDataTable_Selected(object sender, RoutedEventArgs e)
        {
            EntityTreeModel model = tvListDataTable.SelectedItem as EntityTreeModel;
            int currentIndex = list.IndexOf(model);   // 当前节点Index
            TreeViewItem selectedItem = (e.OriginalSource as TreeViewItem);
            var  item = this.List[currentIndex - 1];
        }

 <HierarchicalDataTemplate x:Key="DataTemplateTable" ItemsSource="{Binding EntityTreeModel}">
            <TextBlock Text="{Binding Name}"></TextBlock>
        </HierarchicalDataTemplate>
<!--绑定DataTable-->
                <TreeView Name="tvListDataTable" Width="200" Margin="10,0,0,0"  Height="200" ItemTemplate="{DynamicResource DataTemplateTable}" HorizontalAlignment="Left" TreeViewItem.Selected="tvListDataTable_Selected">
                   
                </TreeView>