c# 解析JSON的几种办法

主要类命名空间限制内建LINQ支持DataContractJsonSerializerSystem.Runtime.Serialization.Json通用否JavaScriptSerializerSystem.Web.Script.Serialization只能在Web环境使用否JsonArray 、JsonObject 、JsonValueSystem.Json只能在Silverlight中使用是JsonConvert 、JArray 、JObject、JValue 、JPropertyNewtonsoft.Json通用是

转自：http://www.cnblogs.com/bayonetxxx/archive/2012/04/07/2436336.html

准备数据

实体类：

    [DataContract]     public class Person     {         [DataMember(Order = 0, IsRequired = true)]         public string Name { get; set; }          [DataMember(Order = 1)]         public int Age { get; set; }          [DataMember(Order = 2)]         public bool Alive { get; set; }          [DataMember(Order = 3)]         public string[] FavoriteFilms { get; set; }          [DataMember(Order = 4)]         public Person Child { get; set; }     } 

定义：

Action<object> log = o => Console.WriteLine(o); Func<int, int, int> add = (x, y) => x + y;  var p1 = new Person {     Age = 12,     Alive = true,     Name = "lj",     FavoriteFilms = new[] { "Up", "Avatar" } }; var p2 = new Person() { Age = 28, Name = "cy", Child = p1 };              

使用DataContractJsonSerializer

帮助类：

    // using System.Runtime.Serialization.Json;          /// <summary>     /// 解析JSON，仿Javascript风格     /// </summary>     public static class JSON     {          public static T parse<T>(string jsonString)         {             using (var ms = new MemoryStream(Encoding.UTF8.GetBytes(jsonString)))             {                 return (T)new DataContractJsonSerializer(typeof(T)).ReadObject(ms);             }         }          public static string stringify(object jsonObject)         {             using (var ms = new MemoryStream())             {                 new DataContractJsonSerializer(jsonObject.GetType()).WriteObject(ms, jsonObject);                 return Encoding.UTF8.GetString(ms.ToArray());             }         }     } 

用法：

    // 序列化     var jsonString = JSON.stringify(new[] { p1, p2 });     log(jsonString == JSON.stringify(new List<Person>() { p1, p2 }));   //true     log(jsonString);     // 反序列化，泛型集合     JSON.parse<List<Person>>(jsonString);     // 数组转换                 JSON.parse<Person[]>(jsonString); 

输出：

[{"Name":"lj","Age":12,"Alive":true,"FavoriteFilms":["Up","Avatar"],"Child":null },{"Name":"cy","Age":28,"Alive":false,"FavoriteFilms":null,"Child":{"Name":"lj", "Age":12,"Alive":true,"FavoriteFilms":["Up","Avatar"],"Child":null}}] 

使用JavaScriptSerializer

    // using System.Web.Script.Serialization;          var jser    = new JavaScriptSerializer();     var json    = jser.Serialize(new List<Person>() { p1, p2 });     var persons = jser.Deserialize<List<Person>>(json); 

使用Silverlight

    // using System.Json          var css = "{ /"#header/" : {background:/"red/"}, layout : [5,4,1],color:/"cyan/" }";          var style = JsonObject.Parse(css) as JsonObject;              (     from s in style     where s.Key == "color"     select (string)s.Value     ).First().ToString();         // "cyan"               // 更多操作     style["layout"][0] = 22;          var hd = style["#header"];     style["body>div+p"] = hd;     style.Remove("#header");          var bd = new JsonObject();     bd["border"] = "1px solid cyan";     style["body>div+p"]["#meta"] = bd;     style.ToString();         // {"layout":[22,4,1],"color":"cyan","body>div+p":{"background":"red","#meta":{"border":"1px solid cyan"}}} 

使用JSON.NET

    // using Newtonsoft.Json;          var json = JsonConvert.SerializeObject(new[] { p1, p2 });     var persons = JsonConvert.DeserializeObject<List<Person>>(json);     var ja = JArray.Parse(jsonString);                 log(ja);    //注意，格式化过的输出 

输出：

[   {     "Name": "lj",     "Age": 12,     "Alive": true,     "FavoriteFilms": [       "Up",       "Avatar"     ],     "Child": null   },   {     "Name": "cy",     "Age": 28,     "Alive": false,     "FavoriteFilms": null,     "Child": {       "Name": "lj",       "Age": 12,       "Alive": true,       "FavoriteFilms": [         "Up",         "Avatar"       ],       "Child": null     }   } ] 

LINQ：

    var ageCount = ja.Select(j => (int)j["Age"]).Aggregate(add);         var q = from j in ja             where !j["Name"].Value<string>().Equals("lj")             select (int)j["Age"];          log(q.Aggregate(add) == ageCount);  //false 

其他：

    // 与Linq to XML 相似的嵌套构造函数：     var jo = new JObject(                     new JProperty("age", persons.Select( p => p.Age)),                     new JProperty("funny", true),                     new JProperty("array", new JArray(new[] { 2, 4, 1 }))                     );     log(jo);          // JObject 操作     var css = "{ /"#header/" : {background:/"red/"}, layout : [5,4,1] }";     var style = JObject.Parse(css);      var bd = new JObject();     bd["color"] = "1px solid cyan";      style["border"] = bd;      var hd = style["#header"];     style["body>div+p"] = hd;      hd.Parent.Remove();      style["layout"][0] = 22;     log(style); 

输出：

    {       "age": [         12,         28       ],       "funny": true,       "array": [         2,         4,         1       ]     }     {       "layout": [         22,         4,         1       ],       "border": {         "color": "1px solid cyan"       },       "body>div+p": {         "background": "red"       }     } 

 

 

来自：http://www.mzwu.com/article.asp?id=1913

 

实体类Student：

程序代码

/// <summary>
/// 学生实体类
/// </summary>
[System.Runtime.Serialization.DataContract(Namespace="http://www.mzwu.com/")]
public class Student
{
    private string _Name;
    private int _Age;

    public Student(string name, int age)
    {
        _Name = name;
        _Age = age;
    }

    /// <summary>
    /// 姓名
    /// </summary>
    [System.Runtime.Serialization.DataMember]
    public string Name
    {
        set {_Name = value;}
        get { return _Name; }
    }

    /// <summary>
    /// 年龄
    /// </summary>
    [System.Runtime.Serialization.DataMember]
    public int Age
    {
        set { _Age = value; }
        get { return _Age; }
    }
}

注意：必须使用DataContractAttribute对类进行标记，使用DataMemberAttribute类成员进行标记，否则该类无法被序列化。

对象转为JSON字符串

程序代码

Student stu = new Student("张三", 20);

System.Runtime.Serialization.Json.DataContractJsonSerializer json = new System.Runtime.Serialization.Json.DataContractJsonSerializer(stu.GetType());
using (MemoryStream stream = new MemoryStream())
{
    json.WriteObject(stream, stu);
    Response.Write(System.Text.Encoding.UTF8.GetString(stream.ToArray()));
}

JSON字符串转为对象

程序代码

System.Runtime.Serialization.Json.DataContractJsonSerializer json = new System.Runtime.Serialization.Json.DataContractJsonSerializer(typeof(Student));
using (MemoryStream stream = new MemoryStream(System.Text.Encoding.UTF8.GetBytes("{/"Age/":20,/"Name/":/"张三/"} ")))
{
    Student stu = (Student)json.ReadObject(stream);
    Response.Write(string.Format("name:{0},age:{1}", stu.Name, stu.Age));
}