getjson方法在jquery中返回“undefined”

我正在开发一个ASP.NET核心2.1项目,并拥有以下模型

人

public class Person
{
    [Key]
    public int ID { get; set; }

    [Required]
    [MaxLength(150)]
    public string Name { get; set; }

    [Required]
    [MaxLength(150)]
    public string Family { get; set; }

    [Required]
    public int Age { get; set; }
}

我的项目中有一个Web API控制器,您可以看到它。

Web API控制器

[Produces("application/json")]
[Route("api/People")]
public class PeopleController : ControllerBase
{

    private readonly ApplicationContext _db;

    public PeopleController(ApplicationContext db)
    {
        _db = db;
    }

    [HttpGet]
    public IEnumerable<Person> GetPerson()
    {
        return _db.Person;
    }
}

现在我想从我的Web API控制器中获取数据并显示 index.cshtml

索引文件

<h2>List Person</h2>

<table class="table table-bordered" id="list">
  <tr>
    <th>ID</th>
    <th>Name</th>
    <th>Family</th>
    <th>Age</th>
  </tr>
</table>

<script>
  $.getJSON("/api/People", function(res) {
    $.each(res, function(key, val) {
      alert(val.Age);
      var item =
        "<tr><td>" +
        val.ID +
        "</td><td>" +
        val.Name +
        "</td><td>" +
        val.Family +
        "</td><td>" +
        val.Age +
        "</td><td></td></tr>";

      $("#list").append(item);
    });
  });
</script>

浏览器中“网络”选项卡中的实际JSON

[{"id":1,"name":"jack","family":"bfd","age":30},{"id":2,"name":"mr john","family":"sobhany","age":36}]

但有一个问题。所有数据都显示在我的视图中,但所有值都是 undefined . 我的密码有什么问题?