Assembly: System.Web (in System.Web.dll)
Any class that derives from the CacheDependency class must implement this method.
When you derive from the CacheDependency class, you use the base functionality of any method or property that you have not overridden. When you create an instance of the derived class, it represents the files, cache keys, database tables, or other arbitrary objects that you want to make a cached item dependent upon. When a dependency item changes, this method notifies the base functionality of the CacheDependency class that the item has changed, so that the values of the HasChanged and UtcLastModified properties can be updated.
The following code example shows a class that inherits from the CacheDependency class. It creates a public method, ResetDependency, that uses the SetUtcLastModified method to change the time at which the dependency was modified, and then calls the method.
' Declare the class. Public Class CustomCacheDependency Inherits CacheDependency ' Constructor with no arguments ' provided by CacheDependency class. Public Sub New() End Sub ' New ' 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