如何让包含层次结构的datatable 直接绑定到treeview

   Treeview 可以绑定支持IHierarchicalDataSource接口的数据

那就让dataTable转成該结构TreeViewDataSource.rar

　　　　//调用方法        

　　　　DataTable dt = getCategoriesData();
            InsTreeViewDataSource dataSource = new InsTreeViewDataSource
                ("parentcode", "categorycode", "categoryname", dt);

            TreeView1.DataSource = dataSource;
            TreeNodeBinding bind = new TreeNodeBinding();
            bind.TextField = "categoryname";
            bind.ValueField = "categorycode";
            TreeView1.DataBindings.Add(bind);
            TreeView1.DataBind();