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CacheDependency.NotifyDependencyChanged(Object, EventArgs) 方法

定義

告知基底 CacheDependency 物件,由衍生的 CacheDependency 類別所表示的相依性已經變更。

protected:
 void NotifyDependencyChanged(System::Object ^ sender, EventArgs ^ e);
protected void NotifyDependencyChanged (object sender, EventArgs e);
member this.NotifyDependencyChanged : obj * EventArgs -> unit
Protected Sub NotifyDependencyChanged (sender As Object, e As EventArgs)

參數

sender
Object

事件的來源。

e
EventArgs

包含事件資料的 EventArgs 物件。

範例

下列程式代碼範例顯示繼承自 類別的 CacheDependency 類別。 它會建立公用方法 ,這個方法 ResetDependencySetUtcLastModified 使用 方法來變更修改相依性的時間,然後呼叫 NotifyDependencyChanged 方法。

' Declare the class.
Public Class CustomCacheDependency 
   Inherits CacheDependency

     ' Constructor with no arguments 
     ' provided by CacheDependency class.
     Public Sub New()
     End Sub
   
     ' Declare a Boolean field named disposedValue.
     ' This will be used by Disposed property.
     Private disposedValue As Boolean                
     
     ' Create accessors for the Disposed property.
     Public Property Disposed As Boolean
       Get
           Return disposedValue
       End Get
       Set (ByVal value As Boolean)
           disposedValue = value
       End Set
     End Property
     
     ' Create a public method that sets the latest
     ' changed time of the CustomCacheDependency
     ' and notifies the underlying CacheDependency that the 
     ' dependency has changed, even though the HasChanged
     ' property is false.
     Public Sub ResetDependency()
        If Me.HasChanged = False              
           SetUtcLastModified(DateTime.MinValue)
           NotifyDependencyChanged(Me, EventArgs.Empty)
        End If
     End Sub
     
     ' Overrides the DependencyDispose method to set the
     ' Disposed proerty to true. This method automatically
     ' notifies the underlying CacheDependency object to 
     ' release any resources associated with this class. 
     Protected Overrides Sub DependencyDispose()
        Disposed = True
     End Sub
     
     
 End Class

備註

任何衍生自 類別的 CacheDependency 類別都必須實作這個方法。

當您衍生自 類別時 CacheDependency ,您可以使用任何尚未覆寫的方法或屬性的基底功能。 當您建立衍生類別的實例時,它代表要讓快取專案相依的檔案、快取索引鍵、資料庫數據表或其他任意物件。 當相依性項目變更時,這個方法會通知類別的CacheDependency基底功能已變更專案,以便更新和 UtcLastModified 屬性的值HasChanged

適用於

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