C# 解析嵌套的json文件.

概述

　　今天我同学问我如何转换json文件,没处理过,网上搜了一下,json转excel的很少,反过来倒是有许多人写了工具.

json文件的结构大致是这样的:

 {"votes": {"funny": , "useful": , "cool": }, "user_id": "CR2y7yEm4X035ZMzrTtN9Q", "name": "Jim", "average_stars": 5.0, "review_count": , "type": "user"}
 {"votes": {"funny": , "useful": , "cool": }, "user_id": "_9GXoHhdxc30ujPaQwh6Ew", "name": "Kelle", "average_stars": 1.0, "review_count": , "type": "user"}
 {"votes": {"funny": , "useful": , "cool": }, "user_id": "8mM-nqxjg6pT04kwcjMbsw", "name": "Stephanie", "average_stars": 5.0, "review_count": , "type": "user"}
 {"votes": {"funny": , "useful": , "cool": }, "user_id": "Ch6CdTR2IVaVANr-RglMOg", "name": "T", "average_stars": 5.0, "review_count": , "type": "user"}
 {"votes": {"funny": , "useful": , "cool": }, "user_id": "NZrLmHRyiHmyT1JrfzkCOA", "name": "Beth", "average_stars": 1.0, "review_count": , "type": "user"}
 {"votes": {"funny": , "useful": , "cool": }, "user_id": "mWx5Sxt_dx-sYBZg6RgJHQ", "name": "Amy", "average_stars": 3.79, "review_count": , "type": "user"}
 {"votes": {"funny": , "useful": , "cool": }, "user_id": "hryUDaRk7FLuDAYui2oldw", "name": "Beach", "average_stars": 3.8300000000000001, "review_count": , "type": "user"}
 {"votes": {"funny": , "useful": , "cool": }, "user_id": "2t6fZNLtiqsihVmeO7zggg", "name": "christine", "average_stars": 3.0, "review_count": , "type": "user"}
 {"votes": {"funny": , "useful": , "cool": }, "user_id": "mn6F-eP5WU37b-iLTop2mQ", "name": "Denis", "average_stars": 4.5, "review_count": , "type": "user"}

我定义一个类(User),用于构造json文件对应的每行(每行对应一个User对象).

然后定义一个UserManager类去处理,返回一个List<User>,完整代码如下:

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;

 using Json_User;

 namespace Json_User {
     //对应json每行.
     public class User {
         public Votes votes { get; private set; }

         public string user_id { get; private set; }

         public string name { get; private set; }

         public double average_stars { get; private set; }

         public int review_count { get; private set; }

         public string type { get; private set; }

         public User(Votes votes, string user_id, string name, double average_stars, int review_count, string type) {
             this.votes = votes;
             this.user_id = user_id;
             this.name = name;
             this.average_stars = average_stars;
             this.review_count = review_count;
             this.type = type;
         }
     }

     public class Votes {
         public int funny { get; private set; }

         public int useful { get; private set; }

         public int cool { get; private set; }

         public Votes(int funny, int useful, int cool) {
             this.funny = funny;
             this.useful = useful;
             this.cool = cool;
         }
     }

     //处理类.
     static class UserManager {
         /// <summary>
         /// 解析嵌套的json.如:"{"votes": {"funny": 0, "useful": 7, "cool": 0}, "user_id": "CR2y7yEm4X035ZMzrTtN9Q", "name": "Jim", "average_stars": 5.0, "review_count": 6, "type": "user"}"
         /// </summary>
         /// <param name="lines">没行代表一个User</param>
         /// <returns></returns>
         public static List<User> ParseJSONString(string[] lines) {
             System.Web.Script.Serialization.JavaScriptSerializer ser = new System.Web.Script.Serialization.JavaScriptSerializer();
             Dictionary<string, object> userDic = null;

             List<User> users = new List<User>(lines.Length);
             User u = null;
             Votes v = null;

             //为成员变量赋值.
             int funny;
             int useful;
             int cool;
             string user_id;
             string name;
             double average_stars;
             int review_count;
             string type;
             foreach (string item in lines) {
                 //User.
                 userDic = ser.Deserialize<Dictionary<string, object>>(item);

                 //User中的votes成员变量.
                 Dictionary<string, object> votesDic = (Dictionary<string, object>)userDic["votes"];

                 funny = int.Parse(votesDic["funny"].ToString());
                 useful = int.Parse(votesDic["useful"].ToString());
                 cool = int.Parse(votesDic["cool"].ToString());
                 v = new Votes(funny, useful, cool);

                 user_id = userDic["user_id"].ToString();
                 name = userDic["name"].ToString();
                 average_stars = double.Parse(userDic["average_stars"].ToString());
                 review_count = int.Parse(userDic["review_count"].ToString());
                 type = userDic["type"].ToString();

                 u = new User(v, user_id, name, average_stars, review_count, type);
                 users.Add(u);
             }
             return users;
         }

         // remove "this" if not on C# 3.0 / .NET 3.5
         public static System.Data.DataTable ConvertToDatatable<T>(this IList<T> data) {
             System.ComponentModel.PropertyDescriptorCollection props =
                 System.ComponentModel.TypeDescriptor.GetProperties(typeof(T));
             System.Data.DataTable table = new System.Data.DataTable();
             for (int i = ; i < props.Count; i++) {
                 System.ComponentModel.PropertyDescriptor prop = props[i];
                 table.Columns.Add(prop.Name, prop.PropertyType);
             }
             object[] values = new object[props.Count];
             foreach (T item in data) {
                 for (int i = ; i < values.Length; i++) {
                     values[i] = props[i].GetValue(item);
                 }
                 table.Rows.Add(values);
             }
             return table;
         }
     }
 }