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默认情况下,我的 Treeview 在所有节点上显示加号。即使是那些没有孩子的节点,这是错误的。

但是,一旦我尝试扩展该节点,加号就会消失。

我动态填充 Treeview。

这是一些代码:

    protected void CategoriesTreeView_TreeNodePopulate(object sender, TreeNodeEventArgs e)
    {
        populateSubLevel(Int32.Parse(e.Node.Value), e.Node);
    }

    private void populateRootLevel()
    {
        DataSet rootProductCategoriesDS = myDALObject.getRootProductCategories_DAL(false);

        DataTable rootProductCategoriesDT = rootProductCategoriesDS.Tables[0];
        populateNodes(rootProductCategoriesDT, CategoriesTreeView.Nodes, true);
    }

    private void populateNodes(DataTable dt, TreeNodeCollection nodes, bool rootLevel)
    {
        foreach (DataRow dr in dt.Rows)
        {
            TreeNode tn = new TreeNode();
            //tn.Text = dr["CategoryName"].ToString();

            if (rootLevel)
            {
                tn.Text = String.Format("<span class=\"root-menu-item\">{0}</strong>", dr["CategoryName"].ToString());

            }
            else
            {
                tn.Text = dr["CategoryName"].ToString();
            }

            tn.Value = dr["CategoryId"].ToString();
            tn.NavigateUrl = "Category.aspx?CategoryID=" + dr["CategoryId"].ToString();

            // Collapse som standard.
            tn.Expanded = false;

            for (int i = 0; i < categories.Length; i++)
            {
                // Expandera om den finns med.
                if (categories[i] == dr["CategoryID"].ToString())
                {
                    tn.Expanded = true;
                }
            }

            nodes.Add(tn);

            //If node has child nodes, then enable on-demand populating
            tn.PopulateOnDemand = ((int)(dr["childnodecount"]) > 0);
        }
    }

    private void populateSubLevel(int parentid, TreeNode parentNode)
    {
        DataSet myDataset;
        myDataset = myDALObject.getChildProductCategories_DAL(parentid, false);

        populateNodes(myDataset.Tables[0], parentNode.ChildNodes, false);
    }
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