CacheDependency.DependencyDispose 方法

  • 参考

定义

命名空间:
System.Web.Caching
程序集:
System.Web.dll

释放由 CacheDependency 类和从 CacheDependency 派生的所有类使用的资源。

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

示例

下面的代码示例演示一个从 CacheDependency 类继承并重写 方法的 DependencyDispose 类。 调用此方法时，它会将名为 的 Disposed 自定义布尔属性设置为 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

注解

任何派生自 CacheDependency 类的类都需要实现此方法，以清理派生类已使用的资源。

适用于

另请参阅