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C#递归方法实现无限级分类显示效果实例

程序员文章站 2022-05-18 14:17:32
本文实例讲述了c#递归方法实现无限级分类显示效果。分享给大家供大家参考,具体如下: 运行效果如下图所示: 具体代码如下: <%@ page lang...

本文实例讲述了c#递归方法实现无限级分类显示效果。分享给大家供大家参考,具体如下:

运行效果如下图所示:

C#递归方法实现无限级分类显示效果实例

具体代码如下:

<%@ page language="c#" autoeventwireup="true" codefile="roledemo20150305.aspx.cs" inherits="roledemo20150305" %>
<!doctype html public "-//w3c//dtd xhtml 1.0 transitional//en" "http://www.w3.org/tr/xhtml1/dtd/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
  <title>c#无限级分类递归显示示例</title>
  <style type="text/css">
  span { float:left; clear:both;}
  </style>
  <script src="js/jquery-1.9.1.js" type="text/javascript"></script>
  <script type="text/javascript">
    $(function () {
      $("span").eq(0).show();
      $("span").each(function (i) {
        var curr = $(this).attr("data-id");
        $(this).click(function () {
          $("span").each(function (i) {
            var father = $(this).attr("data-father");
            if (father == curr) {
              $(this).show();
            }
          });
        });
      });
    });
  </script>
</head>
<body>
  <form id="form1" runat="server">
  <div>
    <asp:gridview id="gridview1" runat="server">
    </asp:gridview>
    <br/><br/><br/><br/>
    <asp:literal id="lt1" runat="server"></asp:literal>
  </div>
  </form>
</body>
</html>

using system;
using system.collections.generic;
using system.linq;
using system.web;
using system.text;
using system.data;
using system.web.ui;
using system.web.ui.webcontrols;
public partial class roledemo20150305 : system.web.ui.page
{
  protected void page_load(object sender, eventargs e)
  {
    datatable dt = createdt();
    datatable dtfinal = dt.clone();
    list<string> list = new list<string>();
    string userstr = getuserdata();
    if (userstr.contains(","))
    {
      string[] strs = userstr.split(',');
      for (int i = 0; i < strs.length; i++)
      {
        list.add(strs[i]);
      }
    }
    else
    {
      list.add(userstr);
    }
    for (int i = 0; i < list.count; i++)
    {
      string module_id = list[i];
      datarow[] drsource = dt.select(" module_id = '" + module_id + "'"); //最终dt是否存在该数据
      datarow[] drexist = dtfinal.select(" module_id = '" + module_id + "'"); //最终dt是否存在该数据
      if (drexist.length == 0)
      {
        dtfinal.rows.add(drsource[0]["module_id"], getpretag(drsource[0]["module_level"]) + drsource[0]["module_name"], drsource[0]["module_fatherid"],
          drsource[0]["module_url"], drsource[0]["module_order"], drsource[0]["module_level"]); //添加记录
      }
      findfatherfromdt(dt, drsource, dtfinal);
    }
    //显示方式一
    dataview dv = dtfinal.defaultview;
    dv.sort = "module_id asc";
    datatable dtneed = dv.totable();
    gridview1.datasource = dtneed;
    gridview1.databind();
    //显示方式二
    stringbuilder builder = new stringbuilder();
    for (int i = 0; i < dtneed.rows.count; i++)
    {
      datarow dr = dtneed.rows[i];
      builder.appendline("<span data-id='" + dr["module_id"] + "' data-father='" + dr["module_fatherid"] + "' style='display:none'>"
       + dr["module_name"] + "</span>");
    }
    lt1.text = builder.tostring();
  }
  /// <summary>
  /// 继续追溯添加父类记录
  /// </summary>
  /// <param name="dt"></param>
  /// <param name="dtfinal"></param>
  protected void findfatherfromdt(datatable dt, datarow[] drfather, datatable dtfinal)
  {
    datarow[] drfatherup = dt.select(" module_id = '" + drfather[0]["module_fatherid"] + "'");
    datarow[] drfatherupexist = dtfinal.select(" module_id = '" + drfather[0]["module_fatherid"] + "'");
    if (drfatherup.length > 0 && drfatherupexist.length == 0) //该记录存在父类且父类未添加到最终dt
    {
      dtfinal.rows.add(drfatherup[0]["module_id"], getpretag(drfatherup[0]["module_level"]) + drfatherup[0]["module_name"], drfatherup[0]["module_fatherid"],
          drfatherup[0]["module_url"], drfatherup[0]["module_order"], drfatherup[0]["module_level"]); //继续追溯添加父类记录
      findfatherfromdt(dt, drfatherup, dtfinal);
    }
  }
  #region 添加前缀
  protected string getpretag(object num)
  {
    string pre = string.empty;
    int i = convert.toint32(num);
    if (i < 2)
    {
    }
    else if (i == 2)
    {
      pre += "└";
    }
    else
    {
      pre += "└";
      for (int j = 0; j < i - 2; j++)
      {
        pre += "─";
      }
    }
    return pre;
  }
  #endregion
  #region 用户测试数据
  protected static string getuserdata()
  {
    datatable dt = new datatable();
    dt.columns.add("userid");
    dt.columns.add("usermoduleoption");
    dt.rows.add("张三", "m01010305,m010205,m0101030301");
    return dt.rows[0]["usermoduleoption"].tostring();
  }
  #endregion
  #region 创建数据
  protected static datatable createdt()
  {
    datatable dt = new datatable();
    dt.columns.add("module_id");
    dt.columns.add("module_name");
    dt.columns.add("module_fatherid");
    dt.columns.add("module_url");
    dt.columns.add("module_order");
    dt.columns.add("module_level");
    dt.rows.add("c1", "全国", "0", "", "1", "1");
    dt.rows.add("m01", "广东", "c1", "", "1", "2");
    //深圳
    dt.rows.add("m0101", "深圳", "m01", "3.aspx", "100", "3");
    dt.rows.add("m010101", "南山区", "m0101", "4.aspx", "1000", "4");
    dt.rows.add("m010102", "罗湖区", "m0101", "", "1001", "4");
    dt.rows.add("m010103", "福田区", "m0101", "", "1002", "4");
    dt.rows.add("m010104", "宝安区", "m0101", "", "1003", "4");
    dt.rows.add("m010105", "龙岗区", "m0101", "", "1004", "4");
    //深圳 - 福田区
    dt.rows.add("m01010301", "上梅林", "m010103", "", "1002001", "5");
    dt.rows.add("m01010302", "下梅林", "m010103", "", "1002002", "5");
    dt.rows.add("m01010303", "车公庙", "m010103", "", "1002003", "5");
    dt.rows.add("m01010304", "竹子林", "m010103", "", "1002004", "5");
    dt.rows.add("m01010305", "八卦岭", "m010103", "", "1002005", "5");
    dt.rows.add("m01010306", "华强北", "m010103", "", "1002006", "5");
    //深圳 - 福田区 - 车公庙
    dt.rows.add("m0101030301", "天安数码城", "m01010303", "", "100200301", "6");
    //广州
    dt.rows.add("m0102", "广州", "m01", "", "101", "3");
    dt.rows.add("m010201", "越秀区", "m0102", "", "1105", "4");
    dt.rows.add("m010202", "海珠区", "m0102", "", "1106", "4");
    dt.rows.add("m010203", "天河区", "m0102", "", "1107", "4");
    dt.rows.add("m010204", "白云区", "m0102", "", "1108", "4");
    dt.rows.add("m010205", "黄埔区", "m0102", "", "1109", "4");
    dt.rows.add("m010206", "荔湾区", "m0102", "", "1110", "4");
    dt.rows.add("m010207", "罗岗区", "m0102", "", "1111", "4");
    dt.rows.add("m010208", "南沙区", "m0102", "", "1112", "4");
    return dt;
  }
  #endregion
}

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