Question

我正在使用Web API 5，OData和Entity Framework 6开发ASP.Net MVC5应用程序。我已经创建了存储库并使用Entity Framework Power Tools来生成我的实体模型。我在我的DBContext上关闭了延迟加载和代理生成。下面是我如何在存储库类中编写LINQ查询以返回具有关系的实体;

           return repository
            .Query(i => i.IsTransaction == true)
            .Include(i => i.SubInventory)
            .Include(c => c.Contact)                
            .OrderBy(q => q
                .OrderBy(i => i.ItemFullCode))                
            .Select();

此外，在我的ODataConfig文件中，我已设置;

config.Formatters.JsonFormatter.SerializerSettings.ReferenceLoopHandling
            = Newtonsoft.Json.ReferenceLoopHandling.Ignore;

config.Formatters.JsonFormatter.SerializerSettings.PreserveReferencesHandling
            = Newtonsoft.Json.PreserveReferencesHandling.Objects;

我遇到的问题是我的Web API方法JSON响应不包含LINQ查询中包含的关系，而只包含主实体数据。知道我在这里失踪的是什么吗？

以下是我的主要实体的代码。

    public partial class Item : Entity
{
    public Item()
    {
        this.DocumentDatas = new List<DocumentData>();
        this.ItemColorSizes = new List<ItemColorSize>();
        this.ItemPrices = new List<ItemPrice>();
        this.Items1 = new List<Item>();
        this.ItemStocks = new List<ItemStock>();
        this.SeasonalSaleDetails = new List<SeasonalSaleDetail>();
    }

    public string ItemFullCode { get; set; }
    public string ItemCode { get; set; }
    public string ItemName { get; set; }
    public string ItemShortCode { get; set; }
    public string LevelItemFullCode { get; set; }
    public string SupplierCode { get; set; }
    public string SubInvCode { get; set; }
    public Nullable<decimal> PurchasePrice { get; set; }
    public Nullable<decimal> SalePrice { get; set; }
    public Nullable<System.DateTime> ArrivalDate { get; set; }
    public string RefCode { get; set; }
    public Nullable<decimal> TColumn { get; set; }
    public Nullable<bool> TColumnByAmt { get; set; }
    public Nullable<bool> IsGiftItem { get; set; }
    public Nullable<bool> IsTransaction { get; set; }
    public Nullable<bool> IsActive { get; set; }
    public string CreatedBy { get; set; }
    public Nullable<System.DateTime> CreatedDate { get; set; }
    public string ModifiedBy { get; set; }
    public Nullable<System.DateTime> ModifiedDate { get; set; }
    public Contact Contact { get; set; }
    public ICollection<DocumentData> DocumentDatas { get; set; }
    public ICollection<ItemColorSize> ItemColorSizes { get; set; }
    public ICollection<ItemPrice> ItemPrices { get; set; }
    public ICollection<Item> Items1 { get; set; }
    public Item Item1 { get; set; }
    public SubInventory SubInventory { get; set; }
    public ICollection<ItemStock> ItemStocks { get; set; }
    public ICollection<SeasonalSaleDetail> SeasonalSaleDetails { get; set; }
}

Answer 1

如果您正在使用OData查询，那么您可以使用$ expand属性来获取响应中包含的引用。 E.g。

GET http://localhost/odata/Products(1)?$expand=Products/Supplier

将导致加载供应商详细信息，而不仅仅是返回供应商的ID。

{
  "odata.metadata":"http://localhost/odata/$metadata#Categories/@Element",
  "Products":[
    {
      "Supplier":{"Key":"CTSO","Name":"Contoso, Ltd."},
      "ID":1,"Name":"Hat","Price":"15.00","CategoryId":1,"SupplierId":"CTSO"
    },
    {
      "Supplier":{"Key":"CTSO","Name":"Contoso, Ltd."},
      "ID":2,"Name":"Scarf","Price":"12.00","CategoryId":1,"SupplierId":"CTSO"
    },{
      "Supplier":{
        "Key":"FBRK","Name":"Fabrikam, Inc."
      },"ID":3,"Name":"Socks","Price":"5.00","CategoryId":1,"SupplierId":"FBRK"
    }
  ],"ID":1,"Name":"Apparel"
}

有关详细信息，请参阅此article。

ASP.Net WebAPI JSON响应不会序列化实体关系

1 个答案: