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 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
}
希望本文所述对大家C#程序设计有所帮助。
dy("nrwz");
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