C# Newtonsoft.Json 应用

常用的一个简单方法

string jsonText = "{"zone":"海淀","zone_en":"haidian"}";
JObject jo = (JObject)JsonConvert.DeserializeObject(jsonText);
string zone = jo["zone"].ToString();
string zone_en = jo["zone_en"].ToString();

通过JArray和JObject来创建一个音乐专辑结构的一个示例：

  //Newtonsoft.Json.Linq.JObject jsonObject = new Newtonsoft.Json.Linq.JObject {{"Entered", DateTime.Now}};

            Newtonsoft.Json.Linq.JObject jsonObject = new Newtonsoft.Json.Linq.JObject();

            jsonObject.Add("Entered", DateTime.Now);

            dynamic album = jsonObject;

            album.AlbumName = "Dirty Deeds Done Dirt Cheap";
            album.Artist = "AC/DC/DVD";
            album.YearReleased = DateTime.Now.Year;

            album.Songs = new Newtonsoft.Json.Linq.JArray() as dynamic;

            dynamic song = new Newtonsoft.Json.Linq.JObject();
            song.SongName = "Dirty Deeds Done Dirt Cheap";
            song.SongLength = "4:05";
            album.Songs.Add(song);

            song = new Newtonsoft.Json.Linq.JObject();
            song.SongName = "Love at First Feel";
            song.SongLength = "3:01";
            album.Songs.Add(song);

            song = new Newtonsoft.Json.Linq.JObject();
            song.SongName = "小苹果";
            song.SongLength = "03:32";
            album.Songs.Add(song);

            Console.WriteLine(album.ToString());

            Console.ReadLine();

以上代码最重要的是没有明确指定类型，便可将动态对象进行JSON序列化，而JObject对象只是接收数据，具体结构通过动态语言在运行时生成，这意味着此代码可以在运行时被编译，从而体现动态语言的优势。序列化的结果如下图所示：

 //Newtonsoft.Json.Linq.JObject jsonObject = new Newtonsoft.Json.Linq.JObject {{"Entered", DateTime.Now}};
            Newtonsoft.Json.Linq.JObject jsonObject = new Newtonsoft.Json.Linq.JObject();
            jsonObject.Add("Entered", DateTime.Now);
            dynamic album = jsonObject;

            album.AlbumName = "非主流歌曲";

            foreach (var item in jsonObject)  //循环输出动态的值  JObject（基类为JContainer、JObject和JArray）是一个集合，实现了IEnumerable接口，因此你还可以轻松地在运行时循环访问
            {
                Console.WriteLine(item.Key + "的值为：" + item.Value.ToString());
            }

JObject.Parse()和JArray.Parse()方法导入JSON格式，JToken结构支持Parse()和Load()方法，这两个方法可以分别从字符串或各种流读取JSON数据。JValue包括最核心的JSON 解析能力，支持将字符串转化为我们熟悉的动态对象。将JSON字符串转换为成JObject对象，并强制转换为动态类型。

 var jsonString = @"{""Name"":""小苹果"",""Company"":""韩国公司"",   ""Entered"":""2016-11-26 00:14""}";

            dynamic json = Newtonsoft.Json.Linq.JToken.Parse(jsonString) as dynamic;

            string name = json.Name;
            string company = json.Company;
            DateTime entered = json.Entered;
            Console.WriteLine("name:" + name);
            Console.WriteLine("company:" + company);
            Console.WriteLine("entered:" + entered);

            Console.ReadLine();

将JObject和JArray实例映射到一个强类型的对象，所以你可以在同一段代码中混合书写动态和静态类型

            string jsonString1 = @"[{""Name"":""小苹果"",""Age"":""20""},{""Name"":""演员"",""Age"":""2""}]";
            Newtonsoft.Json.Linq.JArray userAarray1 = Newtonsoft.Json.Linq.JArray.Parse(jsonString1) as Newtonsoft.Json.Linq.JArray;
            List<User> userListModel = userAarray1.ToObject<List<User>>();
            foreach (var userModel1 in userListModel)
            {
                Console.WriteLine("Name:" + userModel1.Name);
                Console.WriteLine("Age:" + userModel1.Age);
            }

            Console.WriteLine("");
            string jsonString = @"[{""Name"":""小苹果"",""Age"":""20""}]";
            Newtonsoft.Json.Linq.JArray userAarray = Newtonsoft.Json.Linq.JArray.Parse(jsonString) as Newtonsoft.Json.Linq.JArray;
            Newtonsoft.Json.Linq.JObject jObject = userAarray[0] as Newtonsoft.Json.Linq.JObject;
            User userModel = jObject.ToObject<User>();
            Console.WriteLine("Name:" + userModel.Name);
            Console.WriteLine("Age:" + userModel.Age);

public class User
    {
        public string Name { set; get; }
        public int Age { set; get; }
    }

JSON.NET对动态语言的支持，但也别忘了它对静态类型的强大支持，关于如何序列化和反序列化强类型对象，JsonConvert是一个高级别的静态类，包装更低级别的功能，但你也可以使用JsonSerializer类，该类可以序列化和反序列化各种流

 UserType album = new UserType()
            {
                Type = "普通用户",
                UserListModel = new List<User>() 
                {
                    new User()
                    {
                        Name="张三",
                        Age = 20
                    },
                    new User()
                    {
                        Name="李四",
                        Age = 30
                    }
                }
            };

            // serialize to string            
            string json2 = Newtonsoft.Json.JsonConvert.SerializeObject(album, Newtonsoft.Json.Formatting.Indented);
            Console.WriteLine("序列化结果");
            Console.WriteLine("");
            Console.WriteLine(json2);

            UserType userType = Newtonsoft.Json.JsonConvert.DeserializeObject<UserType>(json2);
            Console.WriteLine("");
            Console.WriteLine("反序列化：");
            Console.WriteLine("Type:"+ userType.Type);
            Console.WriteLine("");
            foreach (var userModel in userType.UserListModel)
            {
                Console.WriteLine("Name:"+userModel.Name);
                Console.WriteLine("Age:" + userModel.Age);
            }

 public class UserType
    {
        public string Type { get; set; }
        public List<User> UserListModel { get; set; }
    }

    public class User
    {
        public string Name { set; get; }
        public int Age { set; get; }
    }

 转自    http://www.cnblogs.com/linJie1930906722/p/6103455.html