https://learn.microsoft.com/en-us/dotnet/api/system.runtime.caching.changemonitor?view=netframework-4.8.1&redirectedfrom=MSDN
ChangeMonitor Class (System.Runtime.Caching) | Microsoft Learn
Provides a base class for a derived custom type that monitors changes in the state of the data that a cache item depends on.
class systemruntimecachingmicrosoftlearn
https://learn.microsoft.com/ko-kr/dotnet/api/system.runtime.caching.changemonitor.onchanged?view=netframework-4.8.1&viewFallbackFrom=net-10.0-pp
ChangeMonitor.OnChanged(Object) Method (System.Runtime.Caching) | Microsoft Learn
Called by derived classes to raise the event when a dependency changes.
objectmethodsystemruntimecaching