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[];
if (dtp.Rows.Count > )
{
//首先清除树型控件内的结点
this.TreeView1.Nodes.Clear();
for (int i = ; 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[];
if (table.Rows.Count > )
{
//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[]; node.ChildNodes.Clear(); //清除之前加载的空节点。
if (table.Rows.Count > )
{
for (int i = ; 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
