C#遞歸方法實現(xiàn)無限級分類顯示效果實例

來源：本站原創(chuàng)|時間：2020-01-10|欄目：C#教程|點擊：次

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(yùn)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(qiáng)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
}

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