1.缩进json

 1 internal class Program
 2 {
 3     static void Main(string[] args)
 4     {
 5         var student = new Student()
 6         {
 7             ID = 1,
 8             Age = 2,
 9             Name = "abc"
10         };
11         var json = JsonConvert.SerializeObject(student, Formatting.Indented);
12 
13         Console.WriteLine(json);
14         Console.ReadLine();
15     }
16 }
17 
18 
19 public class Student
20 {
21     public int ID { get; set; }
22 
23     public string Name { get; set; }
24 
25     public int Age { get; set; }
26 }

2.自定义配置

namespace NewtonSoft.Json.Project
{
    using Newtonsoft.Json;
    using Newtonsoft.Json.Serialization;
    using System;
    using System.Collections.Generic;

    internal class Program
    {
        static void Main(string[] args)
        {
            var student = new Student()
            {
                ID = 1,
                Age = 2,
                Name = "abc",
                School = "jkllkjl"
            };

            var employee = new Employee()
            {
                ID = 2,
                Age = 3,
                Name = "def",
                Company = "jmmm",
                Department = "dffj"
            };

            var list = new List<Person>() { student, employee };

            var setting = new JsonSerializerSettings()
            {
                // 缩进
                Formatting = Formatting.Indented,

                ContractResolver = new DefaultContractResolver()
                {
                    // 名称表示方式
                    NamingStrategy = new DefaultNamingStrategy()
                },
                // 忽略null
                NullValueHandling = NullValueHandling.Ignore,
                // string 转义
                StringEscapeHandling = StringEscapeHandling.Default,
                // 带有序列化类型(反序列化接口或抽象类)
                TypeNameHandling = TypeNameHandling.Auto,
                // 反序列化后对原始对象操作（用JsonConvert.PopulateObject）
                ObjectCreationHandling = ObjectCreationHandling.Auto,
            };
            //var json = JsonConvert.SerializeObject(list, setting);

            var jsonStr = @"
                           [
                             {
                               ""$type"": ""NewtonSoft.Json.Project.Student, NewtonSoft.Json.Project"",
                               ""School"": ""jkllkjl"",
                               ""ID"": 1,
                               ""Name"": ""abc"",
                               ""Age"": 2
                             },
                             {
                               ""$type"": ""NewtonSoft.Json.Project.Employee, NewtonSoft.Json.Project"",
                               ""Company"": ""jmmm"",
                               ""Department"": ""dffj"",
                               ""ID"": 2,
                               ""Name"": ""def"",
                               ""Age"": 3
                             }
                           ]
                           ";
            var obj = JsonConvert.DeserializeObject<List<Person>>(jsonStr, setting);
            Console.WriteLine(obj);
            Console.ReadLine();
        }
    }


    public class Student : Person
    {
        public string School { get; set; }
    }

    public class Employee : Person
    {
        public string Company { get; set; }

        public string Department { get; set; }
    }

    public abstract class Person
    {
        public int ID { get; set; }

        public string Name { get; set; }

        public int Age { get; set; }
    }
}

3.特性

 1     [JsonObject(MemberSerialization = MemberSerialization.OptOut)]
 2     public class Employee : Person
 3     {
 4         /// <summary>
 5         /// 作为Json属性
 6         /// </summary>
 7         [JsonProperty]
 8         public DateTime CeateTime = DateTime.Now;
 9 
10         public string Company { get; set; }
11 
12         public string Department { get; set; }
13 
14         /// <summary>
15         /// 忽略.
16         /// </summary>
17         [JsonIgnore]
18         public string Description => $"{Name} is {Age} years old";
19     }