C#递归方法实现无限级分类显示效果实例
发布时间：2020-12-15 06:37:35 所属栏目：百科 来源：网络整理
导读：本篇章节讲解C#递归方法实现无限级分类显示效果。供大家参考研究具体如下： 运行效果如下图所示： 具体代码如下： %@ Page Language="C#" AutoEventWireup="true" CodeFile="RoleDemo20150305.aspx.cs" Inherits="RoleDemo20150305" %!DOCTYPE htm
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本篇章节讲解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 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","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","1001","4");
dt.Rows.Add("M010103","福田区","1002","4");
dt.Rows.Add("M010104","宝安区","1003","4");
dt.Rows.Add("M010105","龙岗区","1004","4");
//深圳 - 福田区
dt.Rows.Add("M01010301","上梅林","M010103","1002001","5");
dt.Rows.Add("M01010302","下梅林","1002002","5");
dt.Rows.Add("M01010303","车公庙","1002003","5");
dt.Rows.Add("M01010304","竹子林","1002004","5");
dt.Rows.Add("M01010305","八卦岭","1002005","5");
dt.Rows.Add("M01010306","华强北","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","101","3");
dt.Rows.Add("M010201","越秀区","M0102","1105","4");
dt.Rows.Add("M010202","海珠区","1106","4");
dt.Rows.Add("M010203","天河区","1107","4");
dt.Rows.Add("M010204","白云区","1108","4");
dt.Rows.Add("M010205","黄埔区","1109","4");
dt.Rows.Add("M010206","荔湾区","1110","4");
dt.Rows.Add("M010207","罗岗区","1111","4");
dt.Rows.Add("M010208","南沙区","1112","4");
return dt;
}
#endregion
}
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