ASP.NET TreeView控件实现无限极分类教程

 <asp:TreeView ID="TreeView1" runat="server" Height="257px" ImageSet="WindowsHelp"
                    Width="142px">
                    <ParentNodeStyle Font-Bold="False" />
                    <HoverNodeStyle Font-Underline="True" ForeColor="#6666AA" />
                    <SelectedNodeStyle Font-Underline="False" HorizontalPadding="0px" VerticalPadding="0px"
                        BackColor="#B5B5B5" />
                    <NodeStyle Font-Names="Tahoma" Font-Size="8pt" ForeColor="Black" HorizontalPadding="5px"
                        NodeSpacing="0px" VerticalPadding="1px" />
                </asp:TreeView>


第一种方法：这个父节点字段必须从0开始
  public void BindData()
    {
        dt = tm.GetClass();
        //第一次加载时调用方法传参  
        CreateTree(-1, null, dt, this.TreeView1);
        this.TreeView1.ExpandAll();
    }

    /// <summary>    
    /// 创建一个树    
    /// </summary>    
    /// <param name="parentID">父ID</param>    
    /// <param name="node">节点</param>    
    /// <param name="dt">DataTable</param>    
    /// <param name="treeView">TreeView的名称</param>    
    public void CreateTree(int parentID, TreeNode node, DataTable dt, TreeView treeView)
    {
        //实例化一个DataView dt = 传入的DataTable