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：
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<%@ 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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