Asp.Net实现无限分类生成表格的方法(后台自定义输出table)

using System;
using System.Data;
using MySql.Data.MySqlClient;
using System.Configuration;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
/// summary>
///common 的摘要说明
/// /summary>
/// 
namespace yihan
{
  namespace Data
  {
    public class myDataBind
    {
      public myDataBind()
      {
        //
        //TODO: 在此处添加构造函数逻辑
        //
      }
      public static string GetTree_monitor_grp_id(DataTable dt, int parent_id, ref string returnString)
      {
        //绑定目录树
        //dt:DataTable对象;parent_id:父ID;returnString:输出引用变量;
        DataRow[] dr = dt.Select("parent_id=" + parent_id);
        int currentLenght = 0;     //当前次数
        foreach (DataRow row in dr)
        {
          string nodeImg = "";    //节点图片
          string treeLineImg = "";  //树线
          currentLenght += 1;
          if (Convert.ToInt32(row["childCount"]) > 0)
          {nodeImg = "img src='images/treeExpand.gif' align='absmiddle'>";}
          else
          {nodeImg = "img src='images/treeNode.gif' align='absmiddle'>";}
          for (var i = 1; i = Convert.ToInt32(row["level"]); i++)
          {
            //计算treeLineImg
            if (i == Convert.ToInt32(row["level"]))
            {
              if (currentLenght == dr.Length)   //判断当前次数是否与本次dr总数量相等
              { treeLineImg += "└ "; }
              else 
              { treeLineImg += "├ "; }
            }
            else
            {
              treeLineImg += "│ ";
            }
          }
          returnString += "tr>\n";
          returnString += "td align='left'>" + treeLineImg + nodeImg + " " + row["monitor_grp_name"] + "/td>\n";
          returnString += "td align='center'>" + row["level"] + "/td>\n";
          returnString += "td align='center'>" + row["childCount"] + "/td>\n";
          returnString += "td align='center'>";
          returnString += "a href='class_add.aspx?monitor_grp_id=" + row["monitor_grp_id"] + "'>添加子类/a> nbsp;";
          returnString += "a href='class_modi.aspx?monitor_grp_id=" + row["monitor_grp_id"] + "'>修改/a> nbsp;";
          returnString += "a href='class_del.aspx?monitor_grp_id=" + row["monitor_grp_id"] + "' onclick=\"javascript:{if(!confirm('确删要删除该类及其子类吗?'))return false;}\">删除/a> nbsp;";
          returnString += "/td>\n";
          returnString += "/tr>\n";
          GetTree_monitor_grp_id(dt, Convert.ToInt32(row["monitor_grp_id"]), ref returnString);
        }
        return returnString;
      }//GetCatalogTree End
     }//myDataBind End
   }
}

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using yihan.Data;
public partial class monitor_monitor_group_class_list : System.Web.UI.Page
{
  protected void Page_Load(object sender, EventArgs e)
  {
    if (!IsPostBack)
    {
      DataTable dt = new DataTable();
      string resultString = "";
      string sql = "select * from monitor_group order by orderby desc,monitor_grp_id";
      DbConn conn = new DbConn();
      dt = conn.DataTable(sql);
      Literal1.Text = myDataBind.GetTree_monitor_grp_id(dt, 0, ref resultString); //调用
      dt.Dispose();
      conn.Close();
    }
  }
}

%@ Page Language="C#" AutoEventWireup="true" CodeFile="class_list.aspx.cs" Inherits="monitor_monitor_group_class_list" %>
body> 
  form id="form1" runat="server">
  table class="conBox" width="100%" border="0" cellpadding="0" cellspacing="1" bgcolor="#66AADD">
   tr align="center" bgcolor="#999999">
    th width="36%" bgcolor="#BAD8EF">监视器组名称/th>
    th width="9%" bgcolor="#BAD8EF">级别/th>
    th width="15%" bgcolor="#BAD8EF">子节点总数/th>
    th width="29%" bgcolor="#BAD8EF">操作/th>
   /tr>
   tr>
    td colspan="5" style="padding-left:6px;background:#DBDBDB;">监视器组/td>
   /tr>
    asp:Literal ID="Literal1" runat="server">/asp:Literal>
  /table>
  /form>
/body>

string s="table>"
s+="tr>td>";
s+=变量值;
s+="/td>/tr>/table>";
ResPonse.Write(s);