如何在返回的JSON中不显示外键ID？

我正在使用.NETCore3.0WebAPI项目。设置关系时，我有一个名为

ProductTypeID

的模型属性，它是保存

ProductType

表ID的外键。当我查询

UnitOfWork

并将此结果返回给控制器时，我希望从JSON中删除

productTypeID

产品控制器：

[HttpGet]
public IEnumerable<Product> Index()
{
    var products = _service.GetAll();

    return products;
}

public override IEnumerable<Product> GetAll()
{
    return _context.products
        .Include(x => x.ProductType)
        .AsEnumerable();
}

在浏览器上返回JSON:

[
  {
    "name": "Pepperoni",
    "price": 12,
    "description": "Test Description",
    "productTypeID": 1,
    "productType": {
      "name": "Pizza",
      "id": 1,
      "createdAt": "20/01/2020 19:28:26",
      "updatedAt": "20/01/2020 19:28:26"
    },
    "id": 1,
    "createdAt": "20/01/2020 19:28:26",
    "updatedAt": "20/01/2020 19:28:26"
  },
  {
    "name": "Margherita",
    "price": 10,
    "description": "This is a margherita pizza",
    "productTypeID": 1,
    "productType": {
      "name": "Pizza",
      "id": 1,
      "createdAt": "20/01/2020 19:28:26",
      "updatedAt": "20/01/2020 19:28:26"
    },
    "id": 2,
    "createdAt": "20/01/2020 19:28:26",
    "updatedAt": "20/01/2020 19:28:26"
  }
]

我相信如果我创建了一个

ViewModel

，并且只返回我需要的属性，这将起作用。但我想知道是否有一种方法可以做到这一点，而无需创建

ViewModel

您可以添加属性以从JSON中删除

productTypeID

：

public class Product:BaseModel
{
    [Required]
    public string Name { get; set; }
    [Required]
    [Column(TypeName = "decimal(18,2)")]
    public decimal Price { get; set; }
    [Required]
    public string Description { get; set; }

    [JsonIgnore]
    public int ProductTypeID { get; set; }

    public virtual ProductType ProductType { get; set; }
}

---

我提出了为每个数据库实体创建视图模型的想法。这似乎是最好的办法。然后我使用AutoMapper将属性映射到viewmodel。感谢所有发表评论的人。

为什么不创建视图模型？这正是视图模型存在的原因。应避免将数据库模型用作数据传输对象。这可能是非常有害的，取决于你做什么。在验证输入时，最好创建单独的类型并根据需要在类型之间正确映射。我会再试一次，并告诉你到底发生了什么，因为这是一个大约一周前，我尝试了这个。感谢您展示Startup.cs？并确保不要将

System.Text.Json

与

Newtonsoft.Json

混用。

[
  {
    "name": "Pepperoni",
    "price": 12,
    "description": "Test Description",
    "productTypeID": 1,
    "productType": {
      "name": "Pizza",
      "id": 1,
      "createdAt": "20/01/2020 19:28:26",
      "updatedAt": "20/01/2020 19:28:26"
    },
    "id": 1,
    "createdAt": "20/01/2020 19:28:26",
    "updatedAt": "20/01/2020 19:28:26"
  },
  {
    "name": "Margherita",
    "price": 10,
    "description": "This is a margherita pizza",
    "productTypeID": 1,
    "productType": {
      "name": "Pizza",
      "id": 1,
      "createdAt": "20/01/2020 19:28:26",
      "updatedAt": "20/01/2020 19:28:26"
    },
    "id": 2,
    "createdAt": "20/01/2020 19:28:26",
    "updatedAt": "20/01/2020 19:28:26"
  }
]

public class Product:BaseModel
{
    [Required]
    public string Name { get; set; }
    [Required]
    [Column(TypeName = "decimal(18,2)")]
    public decimal Price { get; set; }
    [Required]
    public string Description { get; set; }

    [JsonIgnore]
    public int ProductTypeID { get; set; }

    public virtual ProductType ProductType { get; set; }
}