C#构建JSON负载-列表中的列表

以下是一个示例代码，它向.NET对象中嵌套列表中的JSON负载中添加了另一个列表：

using Newtonsoft.Json;
using System.Collections.Generic;

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

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

public static void Main(string[] args)
{
    var person = new Person
    {
        Name = "John",
        Age = 30,
        Addresses = new List<Address>
        {
            new Address { Street = "123 Main St", City = "Anytown", State = "CA" },
            new Address { Street = "456 Oak Ave", City = "Otherville", State = "LA" }
        }
    };

    var payload = JsonConvert.SerializeObject(person);
    Console.WriteLine(payload);
}

在这个示例中，Person对象具有Name和Age属性，以及一个List<Address>属性。Address类只有Street、City和State属性。

例子中的代码演示了如何将两个Address对象添加到Person对象中，其中Address对象是通过新建List<Address>并向其添加两个Address实例来创建的。为了将.NET对象转换为JSON，使用了Newtonsoft.Json库中的JsonConvert.SerializeObject方法。

示例输出：

{
   "Name":"John",
   "Age":30,
   "Addresses":[
      {
         "Street":"123 Main St",
         "City":"Anytown",
         "State":"CA"
      },
      {
         "Street":"456 Oak Ave",
         "City":"Otherville",
         "State":"LA"
      }
   ]
}