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以下是一些 System.Text.Json 在 .NET 9.0 中的使用方式，包括序列化、反序列化、配置选项等，并附上输出结果。

• 基本序列化和反序列化

using System;
using System.Text.Json;
public class Program
{public class Person{public string Name { get; set; }public int Age { get; set; }}public static void Main(){Person person = new Person { Name = "张三", Age = 30 };// 序列化string jsonString = JsonSerializer.Serialize(person);Console.WriteLine("序列化结果：");Console.WriteLine(jsonString);// 反序列化Person deserializedPerson = JsonSerializer.Deserialize<Person>(jsonString);Console.WriteLine("\n反序列化结果：");Console.WriteLine($"姓名：{deserializedPerson.Name}, 年龄：{deserializedPerson.Age}");}
}

• 输出结果：

序列化结果：
{"Name":"张三","Age":30}
反序列化结果：
姓名：张三, 年龄：30

• 使用配置选项

using System;
using System.Text.Json;
public class Program
{public class Person{public string Name { get; set; }public int Age { get; set; }}public static void Main(){Person person = new Person { Name = "张三", Age = 30 };// 配置选项var options = new JsonSerializerOptions{PropertyNamingPolicy = JsonNamingPolicy.CamelCase,WriteIndented = true};// 序列化string jsonString = JsonSerializer.Serialize(person, options);Console.WriteLine("序列化结果（使用配置选项）：");Console.WriteLine(jsonString);}
}

输出结果：

序列化结果（使用配置选项）：
{"name": "张三","age": 30
}

• 处理嵌套对象

using System;
using System.Text.Json;
public class Program
{public class Address{public string City { get; set; }public string Street { get; set; }}public class Person{public string Name { get; set; }public int Age { get; set; }public Address Address { get; set; }}public static void Main(){Person person = new Person{Name = "张三",Age = 30,Address = new Address { City = "北京", Street = "长安街" }};string jsonString = JsonSerializer.Serialize(person);Console.WriteLine("序列化结果（嵌套对象）：");Console.WriteLine(jsonString);}
}

输出结果：

序列化结果（嵌套对象）：
{"Name":"张三","Age":30,"Address":{"City":"北京","Street":"长安街"}}

• 处理集合

using System;
using System.Collections.Generic;
using System.Text.Json;
public class Program
{public class Person{public string Name { get; set; }public int Age { get; set; }}public static void Main(){List<Person> people = new List<Person>{new Person { Name = "张三", Age = 30 },new Person { Name = "李四", Age = 25 }};string jsonString = JsonSerializer.Serialize(people);Console.WriteLine("序列化结果（集合）：");Console.WriteLine(jsonString);}
}

输出结果：

序列化结果（集合）：
[{"Name":"张三","Age":30},{"Name":"李四","Age":25}]