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/// <summary>

     /// 写入json文件

     /// </summary>

     /// <param name="obj"></param>

     /// <param name="savePath"></param>

     public static void ConvertToJson(object obj, string savePath)

     {

         string str = JsonConvert.SerializeObject(obj);

         //json格式化

         JsonSerializer jsonSerializer = new JsonSerializer();

         TextReader textReader = new StringReader(str);

         JsonTextReader jsonTextReader = new JsonTextReader(textReader);

         object _object = jsonSerializer.Deserialize(jsonTextReader);

         if (_object != null)

         {

             StringWriter stringWriter = new StringWriter();

             JsonTextWriter jsonWriter = new JsonTextWriter(stringWriter)

             {

                 Formatting = Formatting.Indented,

                 Indentation = 4,

                 IndentChar = ' '

             };

             jsonSerializer.Serialize(jsonWriter, _object);

             File.WriteAllText(savePath, stringWriter.ToString());

         }

     }

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{

  "name": "张三",

  "age": 20,

  "idCard": "123456789",

  "birthday": "2021-01-01 00:00:00",

  "hobbys": [

    {

      "sort": 1,

      "desc": "写字"

    },

    {

      "sort": 2,

      "desc": "游泳"

    }

  ]

}

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private class Studet

{

    public string name { get; set; }

    public int age { get; set; }

    public string idCard { get; set; }

    public DateTime birthday { get; set; }

    public List<hobby> hobbys { get; set; }

}

private class hobby

{

    public int sort { get; set; }

    public string desc { get; set; }

}

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//需添加引用：System.Web.Extensions

//需导入命名空间：using System.Web.Script.Serialization;

//json.txt中的数据为上面的json数据

string json = File.ReadAllText("d:\\json.txt");

JavaScriptSerializer jss = new JavaScriptSerializer();

//反序列化成Studet对象

Studet student = jss.Deserialize<Studet>(json);

//然后就可以直接用操作对象的方法直接点出来就行

//输出:张三

Console.WriteLine(student.name);

//同样的，我们可以将上面的对象序列化成一个json数据

//序列化成json

string resultJson = jss.Serialize(student);

Console.WriteLine(resultJson);

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//需添加引用：Newtonsoft.Json

//需导入命名空间：using Newtonsoft.Json; using Newtonsoft.Json.Linq;

 //反序列化成对象

Studet student = JsonConvert.DeserializeObject<Studet>(json);

//输出:张三

Console.WriteLine(student.name);

//序列化成json

string resultJson = JsonConvert.SerializeObject(student);

Console.WriteLine(resultJson);

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//使用JObject（JSON.NET）

//反序列化成JObject

JObject jobj = JObject.Parse(json);

//输出:张三

Console.WriteLine(jobj["name"].ToString());

//解析hobbys

 JArray jarr = JArray.Parse(jobj["hobbys"].ToString());

//迭代jarr即可

//同样的，假如我们有一个JObject对象

 JObject obj = new JObject();

 obj["name"] = "张三";

 obj["age"] = 20;

 //输出json数据，直接ToString()就可以

 Console.WriteLine(obj.ToString());

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//第一种：DataTable

DataTable dt = JsonConvert.DeserializeObject<DataTable>(json);

//或者使用JavaScriptSerializer

dt =jss.Deserialize<DataTable>(json);

//解析DataTable即可

//第二种：JArray

JArray jarr = JArray.Parse(json);

//然后去迭代jarr即可

foreach (var j in jarr)

{

    Console.WriteLine(j["key"]);

}

//第三种，也就是我们上面提到了有实体类的情况下

List<Studet> list = JsonConvert.DeserializeObject<List<Studet>>(json);