C# ASP.NET 向单个用户添加属性列表

Question

您好，我正在尝试学习如何创建 Web ASP.NET 应用程序，但我一直在努力获得这个结果。

{
  "memberNumber":"1234567890",
  "forename":"Fred",
  "surname":"Smith",
  "products":[
    {
      "name":"Health Ins",
      "cost":100
    },
    {
      "name":"Travel Ins",
      "cost":150
    }
  ]
}

我不知道如何为每个成员(member)添加不同的产品名称/费用。我可以显示 memberNumber/forename/surname 但在将 products.add 行添加到 members.add 行时出现错误。

这是我的成员(member)模型:

public class Member
    {
        public int memberNumber { get; set; } = 0;
        public string forename { get; set; } = "";
        public string surname { get; set; } = "";
        public List<Products> products { get; set; }
    }

    public class Products
    {
        public string name { get; set; } = "";
        public int cost { get; set; } = 0;
    }

这是我的 Controller :

public class MembersController : ApiController
    {
        List<Member> members = new List<Member>();
        List<Products> products = new List<Products>();

        public MembersController()
        {
            members.Add(new Member { memberNumber = 1234567890, forename = "Fred", surname = "Smith"});
            members.Add(new Member { memberNumber = 1, forename = "Big", surname = "Ben"});
            members.Add(new Member { memberNumber = 2, forename = "Jack", surname = "Ryan" });

            products.Add(new Products { name = "Health Ins", cost = 100 });
            products.Add(new Products { name = "Travel Ins", cost = 150 });
        }
        // GET: api/Members
        public List<Member> Get()
        {
            return members;
        }

        // GET: api/Members/5
        public Member Get(int id)
        {
            return members.Where(x => x.memberNumber == id).FirstOrDefault();
        }
    }

不包括 Post/Put/Delete RESTful 服务。

Answer 1

products.Add(new Products { name = "Health Ins", cost = 100 });
products.Add(new Products { name = "Travel Ins", cost = 150 });

将这些数据添加到

List<Products> products = new List<Products>();

而不是您在 Member 类中的期望。

我认为您可能想在成员中添加 products 集合而不是另一个 List

您可以使用 Auto-Property Initializers 在 Member 类中初始化 products 列表集合。

public class Member
{
    public int memberNumber { get; set; } = 0;
    public string forename { get; set; } = "";
    public string surname { get; set; } = "";
    public List<Products> products { get; set; } = new List<Products>();
}

MembersController 构造的数据将是这样的。

public class MembersController : ApiController
{
    List<Member> members = new List<Member>();
    public MembersController()
    {
        var member1 = new Member { memberNumber = 1234567890, forename = "Fred", surname = "Smith"};
        var member2 = new Member { memberNumber = 1, forename = "Big", surname = "Ben"};
        var member3 = new Member { memberNumber = 2, forename = "Jack", surname = "Ryan" };
        member1.products.Add(new Products { name = "Health Ins", cost = 100 });
        member1.products.Add(new Products { name = "Travel Ins", cost = 150 });

        members.Add(member1);
        members.Add(member2);
        members.Add(member3);
    }
    // GET: api/Members
    public List<Member> Get()
    {
        return members;
    }

    // GET: api/Members/5
    public Member Get(int id)
    {
        return members.Where(x => x.memberNumber == id).FirstOrDefault();
    }
}