Question

我在使用NHibernate v3从数据库中删除实体时遇到问题。

foreach (ShoppingCart s in query )
{
    _session.Delete(s);
    trans.Commit();
    break;
}

“字典中没有给定的密钥”

确实没有比这更具体的信息了。基本上，我使用两个实体，如下所示：

|    ShoppingCart   |==========> | Product          |

ShoppingCart PK：ShoppingCartID，ProductID（也是FK）产品PK：ProductID（无FK）

...一个ShoppingCart实体，里面有很多产品。

我的ShoppingCart映射实体如下所示：

<class name="ShoppingCart" table="LC_SHOPPINGCART" lazy="true" >

<composite-id>
  <key-property name="CartID" column="CARTID" />
  <key-property name="ProductID" column="PRODUCTID" />
  <key-property name="Size" column="SIZE" />
  <key-property name="Color" column="COLOR" />
</composite-id>

<many-to-one foreign-key="ProductID" insert="false" update="false" lazy="false" name="Product">
  <column name="PRODUCTID" sql-type="INT" not-null="true" />
</many-to-one>

<property name="Quantity">
  <column name="QUANTITY" sql-type="INT" not-null="false" />
</property>

<property name="DateAdded">
  <column name="DATEADDED" sql-type="SMALLDATETIME" not-null="false" />
</property>

<property name="Price">
  <column name="PRICE" sql-type="MONEY" not-null="false" />
</property>

ShoppingCart的Entity类：

public ShoppingCart() { }
    [Key]
    public virtual string CartID { get; set; }
    public virtual int ProductID { get; set; }
    public virtual string Size { get; set; }
    public virtual string Color { get; set; }
    public virtual Product Product { get; set; }
    public virtual System.Nullable<int> Quantity { get; set; }
    public virtual DateTime DateAdded { get; set; }
    public virtual System.Nullable<decimal> Price { get; set; }

我的产品映射如下所示：

<class name="Product" table="LC_PRODUCT" lazy="true" >

<id name="ProductID" column="ProductID">
    <generator class="native"></generator>
</id>

  <list name="ShoppingCarts"
        cascade="all-delete-orphan">
      <key column="ProductID"></key>
      <index column="CartID"></index>
      <one-to-many class="ShoppingCart"></one-to-many>
  </list>

<property name="Name">
  <column name="NAME" sql-type="NVARCHAR" not-null="false" />
</property>

<property name="Description">
  <column name="DESCRIPTION" sql-type="VARCHAR" not-null="false" />
</property>

<property name="Price">
  <column name="PRICE" sql-type="MONEY" not-null="false" />
</property>

<property name="Image1FileName">
  <column name="IMAGE1FILENAME" sql-type="NVARCHAR" not-null="false" />
</property>

<property name="Image2FileName">
  <column name="IMAGE2FILENAME" sql-type="NVARCHAR" not-null="false" />
</property>

<property name="OnCatalogPromotion">
  <column name="ONCATALOGPROMOTION" sql-type="BIT" not-null="false" />
</property>

<property name="OnDepartmentPromotion">
  <column name="ONDEPARTMENTPROMOTION" sql-type="BIT" not-null="false" />
</property>

<property name="Sizeable">
  <column name="SIZEABLE" sql-type="BIT" not-null="false" />
</property>

<property name="Colorable">
  <column name="COLORABLE" sql-type="BIT" not-null="false" />
</property>

<property name="DateAdded">
  <column name="DATEADDED" sql-type="SMALLDATETIME" not-null="false" />
</property>

<property name="TotalRemaining">
  <column name="TOTALREMAINING" sql-type="INT" not-null="false" />
</property>

</class>

...以及相应的Product实体类：

public Product() { }
    [Key]
    public virtual int ProductID { get; set; }
    public virtual IList<ShoppingCart> ShoppingCarts { get; set; }
    public virtual string Name { get; set; }
    public virtual string Description { get; set; }
    public virtual System.Nullable<decimal> Price { get; set; }
    public virtual string Image1FileName { get; set; }
    public virtual string Image2FileName { get; set; }
    public virtual bool OnCatalogPromotion { get; set; }
    public virtual bool OnDepartmentPromotion { get; set; }
    public virtual bool Sizeable { get; set; }
    public virtual bool Colorable { get; set; }
    public virtual DateTime DateAdded { get; set; }
    public virtual System.Nullable<int> TotalRemaining { get; set; }

堆栈跟踪如下：

服务器错误。

The given key was not present in the dictionary. 
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: System.Collections.Generic.KeyNotFoundException: The given key was not present in the dictionary.

Source Error: 


Line 106:            //db.lc_ShoppingCarts.DeleteOnSubmit(query);
Line 107:            //db.SubmitChanges();
Line 108:            new ShoppingCartRepository().DeleteProductFromCart( System.Convert.ToInt32  (Grid1.SelectedDataKey["ProductID"]), LinqShoppingCartAccess.cartID);
Line 109:            PopulateControls();
Line 110:        }


Source File: c:\inetpub\wwwroot\ElectronicsRob\LINQControls\ControlTemplates\LinqShoppingCart.ascx.cs    
Line: 108 

Stack Trace: 


[KeyNotFoundException: The given key was not present in the dictionary.]
NHibernate.Engine.StatefulPersistenceContext.RemoveEntity(EntityKey key) in d:\CSharp\NH\nhibernate\src\NHibernate\Engine\StatefulPersistenceContext.cs:435
NHibernate.Action.EntityDeleteAction.Execute() in d:\CSharp\NH\nhibernate\src\NHibernate\Action\EntityDeleteAction.cs:88
NHibernate.Engine.ActionQueue.Execute(IExecutable executable) in d:\CSharp\NH\nhibernate\src\NHibernate\Engine\ActionQueue.cs:136
NHibernate.Engine.ActionQueue.ExecuteActions(IList list) in d:\CSharp\NH\nhibernate\src\NHibernate\Engine\ActionQueue.cs:125
NHibernate.Event.Default.AbstractFlushingEventListener.PerformExecutions(IEventSource session) in d:\CSharp\NH\nhibernate\src\NHibernate\Event\Default\AbstractFlushingEventListener.cs:241
NHibernate.Event.Default.DefaultFlushEventListener.OnFlush(FlushEvent event) in d:\CSharp\NH\nhibernate\src\NHibernate\Event\Default\DefaultFlushEventListener.cs:20
NHibernate.Impl.SessionImpl.Flush() in d:\CSharp\NH\nhibernate\src\NHibernate\Impl\SessionImpl.cs:1477
NHibernate.Transaction.AdoTransaction.Commit() in d:\CSharp\NH\nhibernate\src\NHibernate\Transaction\AdoTransaction.cs:190
ObjexxRepositories.ShoppingCartRepository.DeleteProductFromCart(Nullable`1 prodID, String cartID) in C:\Users\Rob\Documents\Visual Studio 2010\Projects\NGC6744\ObjexxRepositories\Concrete\ShoppingCartRepository.cs:78
LINQControls_LinqShoppingCart.Grid1_RowDeleting(Object sender, GridViewDeleteEventArgs e) in c:\inetpub\wwwroot\ElectronicsRob\LINQControls\ControlTemplates\LinqShoppingCart.ascx.cs:108
System.Web.UI.WebControls.GridView.HandleDelete(GridViewRow row, Int32 rowIndex) +814
System.Web.UI.WebControls.GridView.HandleEvent(EventArgs e, Boolean causesValidation, String validationGroup) +431
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3707

感谢任何帮助，谢谢！

删除时字典NHibernate中没有给定的键

0 个答案: