如何在c#中请求后更改json格式？

using System;
using System.Net.Http;
using System.Threading.Tasks;

public class Program
{
    static async Task Main(string[] args)
    {
        HttpClient client = new HttpClient();
        HttpResponseMessage response = await client.GetAsync("https://api.example.com/data");
        
        if (response.IsSuccessStatusCode)
        {
            string json = await response.Content.ReadAsStringAsync();
            Console.WriteLine(json);
            
            // 在这里对获取的JSON数据进行修改
            // ...
        }
        else
        {
            Console.WriteLine("请求失败，错误码：" + response.StatusCode);
        }
    }
}

using Newtonsoft.Json;

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

string json = "{\"Name\":\"John\", \"Age\":30}";
Person person = JsonConvert.DeserializeObject<Person>(json);

// 修改对象的属性
person.Name = "Alice";
person.Age = 25;

// 将修改后的对象转换为JSON字符串
string modifiedJson = JsonConvert.SerializeObject(person);
Console.WriteLine(modifiedJson);

using System;
using System.Net.Http;
using System.Text;
using System.Threading.Tasks;

public class Program
{
    static async Task Main(string[] args)
    {
        HttpClient client = new HttpClient();
        
        // 构造要发送的JSON数据
        string json = "{\"Name\":\"Alice\", \"Age\":25}";
        StringContent content = new StringContent(json, Encoding.UTF8, "application/json");
        
        HttpResponseMessage response = await client.PostAsync("https://api.example.com/update", content);
        
        if (response.IsSuccessStatusCode)
        {
            Console.WriteLine("JSON数据发送成功！");
        }
        else
        {
            Console.WriteLine("请求失败，错误码：" + response.StatusCode);
        }
    }
}