Called by derived classes to raise the event when a dependency changes.
Assembly: System.Runtime.Caching (in System.Runtime.Caching.dll)
Typically, the method is called when dependency changes occur. The method is also invoked when a change-monitor instance is disposed but the disposal occurs only if the callback has not already been invoked.
If the method is called before the NotifyOnChanged method is called, the state data from the call to the method is saved by the cache implementation. Also, the callback to the OnChangedCallback method is invoked immediately when the NotifyOnChanged method is invoked.