CacheDependency.DependencyDispose 方法

  • 參考

定義

命名空間:
System.Web.Caching
組件:
System.Web.dll

釋放由 CacheDependency 類別及任何衍生自 CacheDependency 的類別所使用的資源。

protected:
 virtual void DependencyDispose();
protected virtual void DependencyDispose ();
abstract member DependencyDispose : unit -> unit
override this.DependencyDispose : unit -> unit
Protected Overridable Sub DependencyDispose ()

範例

下列程式碼範例顯示繼承自 類別的 CacheDependency 類別，並覆寫 DependencyDispose 方法。 呼叫這個方法時，它會將名為 的 Disposed 自訂布林值屬性設定為 true 。

' 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，才能清除已使用衍生類別的資源。

適用於

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