Asp.Net实现无限分类生成表格的方法(后台自定义输出table)

本文实例讲述了asp.net实现无限分类生成表格的方法。分享给大家供大家参考，具体如下：

数据结构 monitor_group

monitor_grp_id      monitor_grp_name     parent_id       level               childcount       orderby
[int,自动递增]           [nvarchar,not null]      [int,not null]  [int,not null]   [int,not null]     [int ,null]
      1       数据库服务器                 0                    1                   2
      2       应用服务器                    0                    1                   2
      3       系统服务器                    0                    1                   0
      4       web服务器                   1                    2                   0
      5      邮件服务器                     1                    2                   0
      6     代理服务器                      2                    2                   0
      7     ftp服务器                       2                    2                   0

\app_code\data.cs

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>  ";
          returnstring += "<a href='class_modi.aspx?monitor_grp_id=" + row["monitor_grp_id"] + "'>修改</a>  ";
          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>  ";
          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
   }
}

class_list.aspx.cs

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();
    }
  }
}

class_list.aspx

<%@ 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>

手写table

string s="<table>"
s+="<tr><td>";
s+=变量值;
s+="</td></tr></table>";
response.write(s);

至于循环及其其他的方法自己构造

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