c# 使用递归 循环遍历导航树结构 并解析

1、数据书库结构

1	家用电器	0	一级菜单
2	手机、数码、京东通信	0	一级菜单
3	电脑、办公	0	一级菜单
4	家具、家居、厨房	0	一级菜单
5	男装、女装、童装、内衣	0	一级菜单
6	个人护装、清洁用品	0	一级菜单
7	大家电	1	二级菜单
8	厨卫大电	1	二级菜单
9	厨卫小电	1	二级菜单
10	生活用品	1	二级菜单
11	平板电视	7	三级菜单
12	家用空调	7	三级菜单
13	油烟机	8	三级菜单
14	燃气灶	8	三级菜单
16	电饭煲	9	三级菜单
17	微波炉	9	三级菜单
18	手机通讯	2	二级菜单
19	运营商	2	二级菜单
20	京东通信	2	二级菜单
21	手机	18	三级菜单
22	对讲机	18	三级菜单
23	手机维修	18	三级菜单
24	选号中心	20	三级菜单
25	自助服务	20	三级菜单
26	电脑整机	3	二级菜单
27	电脑配件	3	二级菜单
28	外设产品	3	二级菜单
29	笔记本	26	三级菜单
30	游戏本	26	三级菜单
31	平板电脑	26	三级菜单
32	CPU	27	三级菜单
33	主板	27	三级菜单
34	显卡	27	三级菜单
36	鼠标	28	三级菜单
37	键盘	28	三级菜单

2、c#代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data.SqlClient;
using SanxingjinxiaocunDAL;
using System.Runtime.Serialization.Json;
using System.IO;
using System.Text;

namespace Sanxingjinxiaocun.qinghua
{
/// <summary>
/// Method 的摘要说明
/// </summary>
public class Method : IHttpHandler
{

public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "text/plain";
#region 调用写好的类，序列化成JSON格式
Cliet clite = new Cliet();
JieDian root = new JieDian();
root.Name = "根节点";
root.Id = ;
clite.creatTheTree("", root); //根节点的parentBh值为"0"

//对root对象进行序列化
DataContractJsonSerializer dc = new DataContractJsonSerializer(root.GetType());
MemoryStream ms = new MemoryStream();
dc.WriteObject(ms, root);
byte[] aryByte = ms.ToArray();
string json = Encoding.UTF8.GetString(aryByte, , aryByte.Length);
ms.Close();
context.Response.Write(json.ToString());
#endregion
}

public bool IsReusable
{
get
{
return false;
}
}
}

#region 根所JSON格式，先写相应的实体类，为读取数据后封装提供支持。
///<summary>
///节点的实体类，记录了数据库中的3个字段
///为的是方便操作
/// </summary>
[Serializable]
public class Item
{
public int Id;
public string Name;
public int ParentId;
public string ContentText;
}
/// <summary>
/// 节点类，基础类
/// </summary>
[Serializable]
public class JieDian
{
public string Name = "";
public int Id = ;
public int ParentId = ;
public string ContentText = "";
public JieDian[] children = null;
}
/// <summary>
/// ss
/// </summary>
[Serializable]
public class Cliet
{
//根据parentBh获取相应的子目录集合
public Item[] GetTheItems(string parentId)
{
//根据父节点获取选项集合
string sql = "select * from t_Menu where parentId=" + parentId;
//这里改成你的数据库表
SqlDataReader dr = DbHelperSQL.ExecuteReader(sql); //这里我直接调用了我库中的类
List<Item> items = new System.Collections.Generic.List<Item>();
while (dr.Read())
{
Item i = new Item();
i.Id = dr.GetInt32();
i.Name = dr.GetString();
i.ParentId = dr.GetInt32();
i.ContentText = dr.GetString();
items.Add(i);
}
dr.Close();
//一定要对这进行关闭
return items.ToArray();
//返回
}

//生成树的方法
public void creatTheTree(string parentId, JieDian jd)
{
//获取
Item[] items = GetTheItems(parentId);
//如果没有字节点了，那就返回空
if (items.Length == )
return;
List<JieDian> jdList = new List<JieDian>();
for (int i = ; i < items.Length; i++)
{
JieDian jiedian = new JieDian();
jiedian.Id = items[i].Id;
jiedian.Name = items[i].Name;
jiedian.ParentId = items[i].ParentId;
jiedian.ContentText = items[i].ContentText;
//递归循环
creatTheTree(items[i].Id.ToString(), jiedian);
jdList.Add(jiedian);
}
jd.children = jdList.ToArray(); //由于对象是引用类型，因为可以改变参数的值
}
}
#endregion
}

3、返回Json:

var data ={
    "ContentText": "",
    "Id": 0,
    "Name": "根节点",
    "ParentId": 0,
    "children": [
        {
            "ContentText": "一级",
            "Id": 1,
            "Name": "家电电器",
            "ParentId": 0,
            "children": [
                {
                    "ContentText": "二级",
                    "Id": 4,
                    "Name": "小米电视",
                    "ParentId": 1,
                    "children": [
                        {
                            "ContentText": "三级",
                            "Id": 7,
                            "Name": "小米1S",
                            "ParentId": 4,
                            "children": null
                        },
                        {
                            "ContentText": "三级",
                            "Id": 8,
                            "Name": "小米2S",
                            "ParentId": 4,
                            "children": null
                        },
                        {
                            "ContentText": "三级",
                            "Id": 9,
                            "Name": "小米3S",
                            "ParentId": 4,
                            "children": null
                        }
                    ]
                },
                {
                    "ContentText": "二级",
                    "Id": 6,
                    "Name": "乐视电视",
                    "ParentId": 1,
                    "children": [
                        {
                            "ContentText": "三级",
                            "Id": 10,
                            "Name": "超级电视1",
                            "ParentId": 6,
                            "children": null
                        },
                        {
                            "ContentText": "三级",
                            "Id": 11,
                            "Name": "超级电视2",
                            "ParentId": 6,
                            "children": null
                        }
                    ]
                }
            ]
        },
        {
            "ContentText": "一级",
            "Id": 3,
            "Name": "孕妇婴儿",
            "ParentId": 0,
            "children": [
                {
                    "ContentText": "二级",
                    "Id": 13,
                    "Name": "孕妇装",
                    "ParentId": 3,
                    "children": null
                },
                {
                    "ContentText": "二级",
                    "Id": 14,
                    "Name": "孕妇枕",
                    "ParentId": 3,
                    "children": null
                },
                {
                    "ContentText": "二级",
                    "Id": 15,
                    "Name": "孕妇钙片",
                    "ParentId": 3,
                    "children": null
                },
                {
                    "ContentText": "二级",
                    "Id": 16,
                    "Name": "婴儿车",
                    "ParentId": 3,
                    "children": [
                        {
                            "ContentText": "三级",
                            "Id": 19,
                            "Name": "摇摇车",
                            "ParentId": 16,
                            "children": null
                        },
                        {
                            "ContentText": "三级",
                            "Id": 20,
                            "Name": "木马车",
                            "ParentId": 16,
                            "children": null
                        }
                    ]
                },
                {
                    "ContentText": "二级",
                    "Id": 18,
                    "Name": "婴儿奶粉",
                    "ParentId": 3,
                    "children": null
                }
            ]
        }
    ]
}

递归循环解析：

$.each(data.children,function(index,item1){
  console.log(item1)
  if(item1.children){
    $.each(item1.children,function(index,item2){
      console.log(item2)
      if(item2.children){
        $.each(item2.children,function(index,item3){
         console.log(item3)
        })
      }
    })
  }