使用Entity Framework獲取外鍵記錄並在Angular中顯示

Question

我在EF中使用數據庫優先方法，因此一切都生成了，並創建了一個Inventory模型類：

public class InventoryModel
{
    public int InventoryID {get;set;}
    public string Employee { get; set; }
    public string Warehouse { get; set; }
    public byte Status { get; set; }
    public DateTime Date { get; set; }

    public ICollection<Localization> Localization { get; set; }
}

這是生成的實體

public partial class xInventory
{
    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]
    public xInventory()
    {
        this.xLocalization = new HashSet<xLocalization>();
    }

    public int InventoryID { get; set; }
    public int Employee { get; set; }
    public byte Warehouse { get; set; }
    public byte Status { get; set; }
    public System.DateTime Date{ get; set; }

    public virtual xWarehouse xWarehouse { get; set; }
    public virtual xEmployee xEmployee { get; set; }
    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
    public virtual ICollection<xLocalization> xLocalization { get; set; }
}

這是我沒有本地化的GET

// GET api/<controller>   
public IEnumerable<InventarioModel> Get()
{
   InventoryContext db = new InventoryContext();

   var query = db.xInventory
       .Select(i => new InventoryModel 
       { 
           InventoryID =  i.InventoryID, 
           Employee = i.xEmployee.Employee, 
           Warehouse = i.xWarehouse.Warehouse, 
           Status = i.Status, 
           Date = i.Date 
       });
    return query;
}

這是我嘗試獲取本地化版本的嘗試

// GET api/<controller>   
public IEnumerable<InventarioModel> Get()
{
   InventoryContext db = new InventoryContext();

   var query = db.xInventory
       .Select(i => new InventoryModel  
       { 
           InventoryID = i.InventoryID, 
           Employee = i.xEmployee.Employee, 
           Localization= i.xLocalization.Any(l => l.InventoryID == i.InventoryID)                    
           Warehouse = i.xWarehouse.Warehouse, 
           Status = i.Status, 
           Date = i.Date 
       });
    return query;
}

但是，這會導致錯誤“無法將類型轉換為布爾值”，並且由於我對linq較陌生，因此我無法弄清楚如何准確獲取每個廣告資源的所有本地化信息

Answer 1

Any方法返回的bool顯然不適合ICollection<Localization> 。 如果您需要獲得過濾的本地化信息，請使用Where

var query = db.xInventory
   .Select(i => new InventoryModel  
   { 
       InventoryID = i.InventoryID, 
       Employee = i.xEmployee.Employee, 
       Localization = i.xLocalization.Where(l => l.InventoryID == i.InventoryID).Tolist()                    
       Warehouse = i.xWarehouse.Warehouse, 
       Status = i.Status, 
       Date = i.Date 
   });