ASP.NET中使用JObject和JArray解析Json数据

本章将和大家分享如何在ASP.NET中使用JObject和JArray解析Json数据。话不多说,下面我们直接来看一个示例。

数据样例(模拟接口返回的Json字符串),如下所示:

{
    "code":1,
    "msg":"获取成功",
    "total":3,
    "data":[
        {
            "StuId":"10000",
            "Name":"张三",
            "Age":18
        },
        {
            "StuId":"10001",
            "Name":"李四",
            "Age":15
        },
        {
            "StuId":"10002",
            "Name":"王五",
            "Age":19
        }
    ],
    "otherinfo":{
        "year":2002,
        "schools":[
            {
                "name":"北京大学",
                "ranking":1
            },
            {
                "name":"清华大学",
                "ranking":2
            },
            {
                "name":"北京航空航天大学",
                "ranking":3
            }
        ]
    }
}

使用JObject和JArray解析上面的Json数据,如下所示:

using System;

using System.Linq;
using Newtonsoft.Json.Linq;

namespace MyJObjectAndJArray
{
    class Program
    {
        static void Main(string[] args)
        {
            Show();
        }

        /// <summary>
        /// 展示
        /// </summary>
        static void Show()
        {
            Console.WriteLine("**********************演示开始**********************");
            Console.WriteLine("");

            //模拟接口返回Json字符串
            string strJson = "{\"code\":1,\"msg\":\"获取成功\",\"total\":3,\"data\":[{\"StuId\":\"10000\",\"Name\":\"张三\",\"Age\":18},{\"StuId\":\"10001\",\"Name\":\"李四\",\"Age\":15},{\"StuId\":\"10002\",\"Name\":\"王五\",\"Age\":19}],\"otherinfo\":{\"year\":2002,\"schools\":[{\"name\":\"北京大学\",\"ranking\":1},{\"name\":\"清华大学\",\"ranking\":2},{\"name\":\"北京航空航天大学\",\"ranking\":3}]}}";

            //Json解析
            JObject jObject = JObject.Parse(strJson);
            if (jObject.ContainsKey("code")) //判断是否包含某个属性名
            {
                Console.WriteLine("包含属性名code");
            }

            if (!jObject.ContainsKey("error"))
            {
                Console.WriteLine("不包含属性名error");
            }

            var msg = jObject.ContainsKey("msg") ? jObject.Value<string>("msg") : "无返回信息";
            Console.WriteLine($"msg={msg}");

            var code1 = Convert.ToInt32(jObject["code"]); //方式1
            var code2 = jObject.Value<int>("code"); //方式2
            Console.WriteLine($"code1={code1} , code2={code2}");

            var year1 = Convert.ToInt32(jObject["otherinfo"]["year"]); //方式1
            var year2 = jObject["otherinfo"].Value<int>("year"); //方式2
            Console.WriteLine($"year1={year1} , year2={year2}");

            var stuId1 = Convert.ToInt32(jObject["data"][0]["StuId"]);
            var stuId2 = jObject["data"][1].Value<int>("StuId");

            JArray data1 = jObject.Value<JArray>("data") ?? new JArray(); //方式1
            var stuId3 = Convert.ToInt32(data1[2]["StuId"]);
            JArray data2 = (JArray)jObject["data"] ?? new JArray(); //方式2
            var stuId4 = data2[2].Value<int>("StuId");
            Console.WriteLine($"stuId1={stuId1} , stuId2={stuId2} , stuId3={stuId3} , stuId4={stuId4} , data1.Count={data1.Count}");

            if (jObject.Value<int>("code") == 1)
            {
                var apiData =
                    (jObject.Value<JArray>("data") ?? new JArray())
                    .Select(m => new
                    {
                        StuId = m.Value<int>("StuId"),
                        Name = m.Value<string>("Name"),
                        Age = m.Value<int>("Age"),
                    })
                    .ToList();
                Console.WriteLine($"apiData.Count={apiData.Count}");

                var apiSchools =
                    (jObject["otherinfo"].Value<JArray>("schools") ?? new JArray())
                    .Select(m => new
                    {
                        name = m.Value<string>("name"),
                        ranking = m.Value<int>("ranking")
                    })
                    .ToList();
                Console.WriteLine($"apiSchools.Count={apiSchools.Count}");

                JObject joOtherInfo = (JObject)jObject["otherinfo"];
                if (joOtherInfo.ContainsKey("schools"))
                {
                    var apiSchools2 =
                        (joOtherInfo.Value<JArray>("schools") ?? new JArray())
                         .Select(m => new
                         {
                             name = m.Value<string>("name"),
                             ranking = m.Value<int>("ranking")
                         })
                         .ToList();
                    Console.WriteLine($"apiSchools2.Count={apiSchools2.Count}");
                }
            }

            Console.WriteLine("");
            Console.WriteLine("**********************演示结束**********************");
            Console.ReadKey();
        }
    }
}

PS:项目中需要引入Newtonsoft.Json程序包。

运行结果如下:

至此本文就全部介绍完了,如果觉得对您有所启发请记得点个赞哦!!! 

 

Demo源码:

链接:https://pan.baidu.com/s/17K_zqhPSvdj7GlXvekWaYQ 
提取码:grux

此文由博主精心撰写转载请保留此原文链接:https://www.cnblogs.com/xyh9039/p/14477480.html

版权声明:如有雷同纯属巧合,如有侵权请及时联系本人修改,谢谢!!!

posted @ 2021-03-06 22:35  谢友海  阅读(78)  评论(0编辑  收藏