用C#写一个JSon序列化和反序列化代码并附加案例

下面是使用 C# 对象进行 JSON 序列化和反序列化的示例代码：

using System;
using System.Collections.Generic;
using System.Text.Json;

namespace JsonDemo
{
    class Program
    {
        static void Main(string[] args)
        {
            // 对象序列化为 JSON 字符串
            var person = new Person
            {
                Name = "John",
                Age = 30,
                IsStudent = true,
                Hobbies = new List<string> { "reading", "traveling", "playing games" },
                Address = new Address
                {
                    Street = "123 Main St",
                    City = "New York",
                    State = "NY",
                    Zip = "10001"
                }
            };
            var json = JsonSerializer.Serialize(person);
            Console.WriteLine(json);

            // JSON 字符串反序列化为对象
            var jsonStr = "{\"name\":\"John\",\"age\":30,\"isStudent\":true,\"hobbies\":[\"reading\",\"traveling\",\"playing games\"],\"address\":{\"street\":\"123 Main St\",\"city\":\"New York\",\"state\":\"NY\",\"zip\":\"10001\"}}";
            var person2 = JsonSerializer.Deserialize<Person>(jsonStr);
            Console.WriteLine(person2.Name);
            Console.WriteLine(person2.Age);
            Console.WriteLine(person2.IsStudent);
            Console.WriteLine(string.Join(", ", person2.Hobbies));
            Console.WriteLine(person2.Address.Street);
            Console.WriteLine(person2.Address.City);
            Console.WriteLine(person2.Address.State);
            Console.WriteLine(person2.Address.Zip);
        }
    }

    public class Person
    {
        public string Name { get; set; }
        public int Age { get; set; }
        public bool IsStudent { get; set; }
        public List<string> Hobbies { get; set; }
        public Address Address { get; set; }
    }

    public class Address
    {
        public string Street { get; set; }
        public string City { get; set; }
        public string State { get; set; }
        public string Zip { get; set; }
    }
}

以上代码中，我们定义了一个 `Person` 类和一个 `Address` 类，分别表示人和地址信息。使用 `System.Text.Json` 命名空间中的 `JsonSerializer` 类进行序列化和反序列化操作。在 `Main` 方法中，我们先创建一个 `Person` 对象，然后将其序列化为 JSON 字符串并输出。接着，我们将 JSON 字符串反序列化为 `Person` 对象，并输出其属性值。

输出结果如下：

{"Name":"John","Age":30,"IsStudent":true,"Hobbies":["reading","traveling","playing games"],"Address":{"Street":"123 Main St","City":"New York","State":"NY","Zip":"10001"}}
John
30
True
reading, traveling, playing games
123 Main St
New York
NY
10001

这个示例中，我们定义了一个 `Person` 对象，包含了名字、年龄、是否为学生、爱好和地址等信息。其中，爱好是一个字符串列表，地址是一个嵌套的对象。序列化后，得到的 JSON 字符串与前面所示的示例相同。反序列化后，我们可以得到与原对象相同的属性值。