CacheDependency.NotifyDependencyChanged(Object, EventArgs) 方法

定義

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

通知基底 CacheDependency 物件派生 CacheDependency 類別所代表的相依關係已變更。

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

一個 EventArgs 包含事件資料的物件。

範例

以下程式碼範例展示了一個繼承自該 CacheDependency 類別的類別。 它建立一個公開方法， ResetDependency該方法利用該 SetUtcLastModified 方法改變相依修改的時間點，然後呼叫該 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

任何從該類別衍生出的 CacheDependency 類別都必須實作此方法。

當你從 CacheDependency 類別衍生時，你會使用任何你未覆蓋的方法或屬性的基礎功能。 當你建立衍生類別的實例時，它代表你想讓快取項目依賴的檔案、快取鍵、資料庫資料表或其他任意物件。 當相依項目變更時，此方法會通知該類別的基本功能CacheDependency該項目已變更，以便更新 和 HasChanged 屬性的值UtcLastModified。

適用於

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