将自定义单字符串转换为c#中的JSON，并根据条件构造最终的json

using Newtonsoft.Json;

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

public class Program
{
    public static void Main()
    {
        string jsonString = "{\"Name\":\"John\",\"Age\":30}";

        // 解析字符串
        Person person = JsonConvert.DeserializeObject<Person>(jsonString);

        // 根据条件构造最终的JSON
        if (person.Age > 18)
        {
            person.Name = "Adult: " + person.Name;
        }
        else
        {
            person.Name = "Child: " + person.Name;
        }

        // 转换为JSON字符串
        string finalJsonString = JsonConvert.SerializeObject(person);

        Console.WriteLine(finalJsonString);
    }
}