asp.net中TreeView的大数据加载速度优化

由于数据量太大，加载树时间很长，所以进行了优化

前台 .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>

后台.cs 

  #region wsw更改树的加载方式

    private void LoadNewTree()

    {

        DataTable dtp = pagBLL.GetList(" superfuncid=0  order by sort asc").Tables[0];

        if (dtp.Rows.Count > 0)

        {

            //首先清除树型控件内的结点

            this.TreeView1.Nodes.Clear();

            for (int i = 0; i < dtp.Rows.Count; i++)

            {



                //实例出一个结点

                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);//增加父节点，这时直接往树TreeView1上加

                this.LoadAddSign(Node.ChildNodes,Convert.ToInt32(dtp.Rows[i]["pagefuncid"].ToString()));//wsw更改

                TreeView1.CollapseAll();



            }

        }

    }

    /// <summary>

    /// 用于加载显示 树形控件 +号的,加载下面的一个节点。

    /// </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)

        {

            //加载"一个"1级节点，就是为了显示 + 号

            tn.Add(new TreeNode());



        }

    }

    /// <summary>

    /// 点击 + 号是节点展开事件

    /// </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(); //清除之前加载的空节点。

            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);//增加父节点，这时直接往树TreeView1上加

                    this.LoadAddSign(Node.ChildNodes, Convert.ToInt32(table.Rows[i]["pagefuncid"].ToString()));//wsw更改

                }



            }

        }



    }

    #endregion