本文實例講述了C#遞歸方法實現(xiàn)無限級分類顯示效果。分享給大家供大家參考，具體如下：
運行效果如下圖所示：
具體代碼如下：
<%@ 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#無限級分類遞歸顯示示例</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 + "'"); //最終DT是否存在該數(shù)據(jù) DataRow[] drExist = dtFinal.Select(" module_id = '" + module_id + "'"); //最終DT是否存在該數(shù)據(jù) 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"]); //添加記錄 } FindFatherFromDT(dt, drSource, dtFinal); } //顯示方式一 DataView dv = dtFinal.DefaultView; dv.Sort = "module_id asc"; DataTable dtNeed = dv.ToTable(); GridView1.DataSource = dtNeed; GridView1.DataBind(); //顯示方式二 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> /// 繼續(xù)追溯添加父類記錄 /// </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) //該記錄存在父類且父類未添加到最終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"]); //繼續(xù)追溯添加父類記錄 FindFatherFromDT(dt, drFatherUp, dtFinal); } } #region 添加前綴 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 用戶測試數(shù)據(jù) protected static string GetUserData() { DataTable dt = new DataTable(); dt.Columns.Add("userId"); dt.Columns.Add("userModuleOption"); dt.Rows.Add("張三", "M01010305,M010205,M0101030301"); return dt.Rows[0]["userModuleOption"].ToString(); } #endregion #region 創(chuàng)建數(shù)據(jù) 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", "全國", "0", "", "1", "1"); dt.Rows.Add("M01", "廣東", "C1", "", "1", "2"); //深圳 dt.Rows.Add("M0101", "深圳", "M01", "3.aspx", "100", "3"); dt.Rows.Add("M010101", "南山區(qū)", "M0101", "4.aspx", "1000", "4"); dt.Rows.Add("M010102", "羅湖區(qū)", "M0101", "", "1001", "4"); dt.Rows.Add("M010103", "福田區(qū)", "M0101", "", "1002", "4"); dt.Rows.Add("M010104", "寶安區(qū)", "M0101", "", "1003", "4"); dt.Rows.Add("M010105", "龍崗區(qū)", "M0101", "", "1004", "4"); //深圳 - 福田區(qū) dt.Rows.Add("M01010301", "上梅林", "M010103", "", "1002001", "5"); dt.Rows.Add("M01010302", "下梅林", "M010103", "", "1002002", "5"); dt.Rows.Add("M01010303", "車公廟", "M010103", "", "1002003", "5"); dt.Rows.Add("M01010304", "竹子林", "M010103", "", "1002004", "5"); dt.Rows.Add("M01010305", "八卦嶺", "M010103", "", "1002005", "5"); dt.Rows.Add("M01010306", "華強北", "M010103", "", "1002006", "5"); //深圳 - 福田區(qū) - 車公廟 dt.Rows.Add("M0101030301", "天安數(shù)碼城", "M01010303", "", "100200301", "6"); //廣州 dt.Rows.Add("M0102", "廣州", "M01", "", "101", "3"); dt.Rows.Add("M010201", "越秀區(qū)", "M0102", "", "1105", "4"); dt.Rows.Add("M010202", "海珠區(qū)", "M0102", "", "1106", "4"); dt.Rows.Add("M010203", "天河區(qū)", "M0102", "", "1107", "4"); dt.Rows.Add("M010204", "白云區(qū)", "M0102", "", "1108", "4"); dt.Rows.Add("M010205", "黃埔區(qū)", "M0102", "", "1109", "4"); dt.Rows.Add("M010206", "荔灣區(qū)", "M0102", "", "1110", "4"); dt.Rows.Add("M010207", "羅崗區(qū)", "M0102", "", "1111", "4"); dt.Rows.Add("M010208", "南沙區(qū)", "M0102", "", "1112", "4"); return dt; } #endregion}新聞熱點
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