[英]Include not working with Entity Framework query
我不確定發生了什么變化,但是,在幾周前我回到我正在處理的應用程序之后,我的.Include()
調用不再適用於我的一個相關表。 奇怪的是它適用於不同的表。 以下是一些代碼,其中的注釋顯示了我的結果:
//Get the order and nothing else.
using (OrderEntity orderContext = new OrderEntity(OrdersConnectionString)) {
var query = from order in orderContext.ShippingOrders
where order.ShipperId == shippingId
select order;
//I got a value!
shippingOrder = query.ToList().FirstOrDefault();
}
//Get the line item and nothing else.
using (OrderEntity orderContext = new OrderEntity(OrdersConnectionString)) {
var query = from orderItem in orderContext.ShippingOrderItems
where orderItem.ShipperId == shippingId
select orderItem;
//I got a value!
shippingOrderItems = query.ToList();
}
這是我困惑的地方:
//Get the order *AND* the line item
using (OrderEntity orderContext = new OrderEntity(OrdersConnectionString)) {
var query = from order in orderContext.ShippingOrders.Include("ShippingOrderItems")
where order.ShipperId == shippingId
select order;
//I get a ShippingOrder result, but no items are returned. I used the SQL Server Profiler and saw the SQL that got executed; it contains the item, EF just isn't loading the object.
shippingOrder = query.ToList().FirstOrDefault();
}
我能夠獲得不同相關表的結果。 這讓我覺得EF缺少我的訂單和訂單項表之間的關系,但是,我不知道如何解決這個問題。
編輯 :這是訂單實體
/// <summary>
/// No Metadata Documentation available.
/// </summary>
[EdmEntityTypeAttribute(NamespaceName="OrderModel", Name="ShippingOrder")]
[Serializable()]
[DataContractAttribute(IsReference=true)]
public partial class ShippingOrder : EntityObject
{
#region Factory Method
/// <summary>
/// Create a new ShippingOrder object.
/// </summary>
/// <param name="shipperId">Initial value of the ShipperId property.</param>
public static ShippingOrder CreateShippingOrder(global::System.String shipperId)
{
ShippingOrder shippingOrder = new ShippingOrder();
shippingOrder.ShipperId = shipperId;
return shippingOrder;
}
#endregion
#region Primitive Properties
/// <summary>
/// No Metadata Documentation available.
/// </summary>
[EdmScalarPropertyAttribute(EntityKeyProperty=true, IsNullable=false)]
[DataMemberAttribute()]
public global::System.String ShipperId
{
get
{
return _ShipperId;
}
set
{
if (_ShipperId != value)
{
OnShipperIdChanging(value);
ReportPropertyChanging("ShipperId");
_ShipperId = StructuralObject.SetValidValue(value, false);
ReportPropertyChanged("ShipperId");
OnShipperIdChanged();
}
}
}
private global::System.String _ShipperId;
partial void OnShipperIdChanging(global::System.String value);
partial void OnShipperIdChanged();
/// <summary>
/// No Metadata Documentation available.
/// </summary>
[EdmScalarPropertyAttribute(EntityKeyProperty=false, IsNullable=true)]
[DataMemberAttribute()]
public global::System.String OrderNumber
{
get
{
return _OrderNumber;
}
set
{
OnOrderNumberChanging(value);
ReportPropertyChanging("OrderNumber");
_OrderNumber = StructuralObject.SetValidValue(value, true);
ReportPropertyChanged("OrderNumber");
OnOrderNumberChanged();
}
}
private global::System.String _OrderNumber;
partial void OnOrderNumberChanging(global::System.String value);
partial void OnOrderNumberChanged();
/// <summary>
/// No Metadata Documentation available.
/// </summary>
[EdmScalarPropertyAttribute(EntityKeyProperty=false, IsNullable=true)]
[DataMemberAttribute()]
public Nullable<global::System.DateTime> OrderDate
{
get
{
return _OrderDate;
}
set
{
OnOrderDateChanging(value);
ReportPropertyChanging("OrderDate");
_OrderDate = StructuralObject.SetValidValue(value);
ReportPropertyChanged("OrderDate");
OnOrderDateChanged();
}
}
private Nullable<global::System.DateTime> _OrderDate;
partial void OnOrderDateChanging(Nullable<global::System.DateTime> value);
partial void OnOrderDateChanged();
/// <summary>
/// No Metadata Documentation available.
/// </summary>
[EdmScalarPropertyAttribute(EntityKeyProperty=false, IsNullable=true)]
[DataMemberAttribute()]
public global::System.String CustomsComment
{
get
{
return _CustomsComment;
}
set
{
OnCustomsCommentChanging(value);
ReportPropertyChanging("CustomsComment");
_CustomsComment = StructuralObject.SetValidValue(value, true);
ReportPropertyChanged("CustomsComment");
OnCustomsCommentChanged();
}
}
private global::System.String _CustomsComment;
partial void OnCustomsCommentChanging(global::System.String value);
partial void OnCustomsCommentChanged();
#endregion
#region Navigation Properties
/// <summary>
/// No Metadata Documentation available.
/// </summary>
[XmlIgnoreAttribute()]
[SoapIgnoreAttribute()]
[DataMemberAttribute()]
[EdmRelationshipNavigationPropertyAttribute("OrderModel", "FK_ShippingOrderItem_ShippingOrder", "ShippingOrderItem")]
public EntityCollection<ShippingOrderItem> ShippingOrderItems
{
get
{
return ((IEntityWithRelationships)this).RelationshipManager.GetRelatedCollection<ShippingOrderItem>("OrderModel.FK_ShippingOrderItem_ShippingOrder", "ShippingOrderItem");
}
set
{
if ((value != null))
{
((IEntityWithRelationships)this).RelationshipManager.InitializeRelatedCollection<ShippingOrderItem>("OrderModel.FK_ShippingOrderItem_ShippingOrder", "ShippingOrderItem", value);
}
}
}
/// <summary>
/// No Metadata Documentation available.
/// </summary>
[XmlIgnoreAttribute()]
[SoapIgnoreAttribute()]
[DataMemberAttribute()]
[EdmRelationshipNavigationPropertyAttribute("OrderModel", "FK_ShippingOrderItemTracking_ShippingOrder", "ShippingOrderTracking")]
public EntityCollection<ShippingOrderTracking> ShippingOrderTrackings
{
get
{
return ((IEntityWithRelationships)this).RelationshipManager.GetRelatedCollection<ShippingOrderTracking>("OrderModel.FK_ShippingOrderItemTracking_ShippingOrder", "ShippingOrderTracking");
}
set
{
if ((value != null))
{
((IEntityWithRelationships)this).RelationshipManager.InitializeRelatedCollection<ShippingOrderTracking>("OrderModel.FK_ShippingOrderItemTracking_ShippingOrder", "ShippingOrderTracking", value);
}
}
}
#endregion
}
我仍然不確定問題的原因是什么。 我決定放棄我的數據庫並重新創建我的表(以及主鍵和外鍵)並再次遷移所有數據。 它實際上修復了它,但是,我不確定最終會有什么不同。 我沒有記錄任何異常,並且基於SQL Server Profiler,它看起來正在執行正確的查詢。
你也可以試試這個:
if (Order.shippingId != null && Order.shippingId > 0)
orderContext.LoadProperty(Orders, Order => Order.ShippingOrderItems);
這將獲取ShippingOrderItems中的匹配訂單ID。
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