asp.net中TreeView的大數據加載速度優化

因爲數據量太大，加載樹時間很長，因此進行了優化

前臺 .aspx

   <asp:Panel ID="Panel2" runat="server" Height="600px" ScrollBars="Auto">
                        <asp:TreeView ID="TreeView1" runat="server" ForeColor="Black" OnTreeNodeExpanded="TreeView1_TreeNodeExpanded" OnSelectedNodeChanged="TreeView1_SelectedNodeChanged">
                            <LeafNodeStyle HorizontalPadding="3px" />
                            <ParentNodeStyle HorizontalPadding="3px" />
                            <RootNodeStyle HorizontalPadding="3px" />
                            <SelectedNodeStyle ForeColor="#009933" />
                        </asp:TreeView>
                    </asp:Panel>

後臺.cs 

  #region wsw更改樹的加載方式
    private void LoadNewTree()
    {
        DataTable dtp = pagBLL.GetList(" superfuncid=0  order by sort asc").Tables[0];
        if (dtp.Rows.Count > 0)
        {
            //首先清除樹型控件內的結點
            this.TreeView1.Nodes.Clear();
            for (int i = 0; i < dtp.Rows.Count; i++)
            {

                //實例出一個結點
                TreeNode Node = new TreeNode();
                Node.Text = dtp.Rows[i]["funcname"].ToString();
                Node.Value = dtp.Rows[i]["pagefuncid"].ToString();
                Node.ToolTip = dtp.Rows[i]["funcurl"].ToString();
                Node.ImageUrl = "../../" + dtp.Rows[i]["imageurl"].ToString(); 
                this.TreeView1.Nodes.Add(Node);//增長父節點，這時直接往樹TreeView1上加
                this.LoadAddSign(Node.ChildNodes,Convert.ToInt32(dtp.Rows[i]["pagefuncid"].ToString()));//wsw更改
                TreeView1.CollapseAll();

            }
        }
    }
    /// <summary>
    /// 用於加載顯示 樹形控件 +號的,加載下面的一個節點。
    /// </summary>
    /// <param name="Conn"></param>
    /// <param name="tn"></param>
    /// <param name="DeptId"></param>
    private void LoadAddSign( TreeNodeCollection tn, int DeptId) //wsw更改
    {
        DataTable table = pagBLL.GetList(" superfuncid=" + DeptId + "  order by sort asc").Tables[0];
        if (table.Rows.Count > 0)
        {
            //加載"一個"1級節點，就是爲了顯示 + 號
            tn.Add(new TreeNode());

        }
    }
    /// <summary>
    /// 點擊 + 號是節點展開事件
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void TreeView1_TreeNodeExpanded(object sender, TreeNodeEventArgs e)
    {
        TreeNode node = e.Node;
        if (node.Expanded == true)
        {
            string bm = e.Node.Value.ToString();//wsw更改
            DataTable table = pagBLL.GetList(" superfuncid=" + bm + "  order by sort asc").Tables[0];

            node.ChildNodes.Clear(); //清除以前加載的空節點。
            if (table.Rows.Count > 0)
            {
                for (int i = 0; i < table.Rows.Count; i++)
                {
                    TreeNode Node = new TreeNode();
                    Node.Text = table.Rows[i]["funcname"].ToString();
                    Node.Value = table.Rows[i]["pagefuncid"].ToString();
                    Node.ToolTip = table.Rows[i]["funcurl"].ToString();
                    Node.ImageUrl = "../../" + table.Rows[i]["imageurl"].ToString();
                    node.ChildNodes.Add(Node);//增長父節點，這時直接往樹TreeView1上加
                    this.LoadAddSign(Node.ChildNodes, Convert.ToInt32(table.Rows[i]["pagefuncid"].ToString()));//wsw更改
                }

            }
        }

    }
    #endregion