vb.net - Implementing Events in a Base Class -

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consider following objects:

public mustinherit class filerepository      public mustoverride sub savestringtofile(byval filetext string, byval filepath string)      public event filesaved(byref sender object, byval eventargs eventargs)  end class  public class xmlfilerepository     inherits filerepository      public overrides sub savestringtofile(byval filetext string, byval filepath string)      end sub      private sub xmlfilerepository_filesaved(byref sender object, byval eventargs system.eventargs) handles me.filesaved      end sub end class

i want base class raise filesaved event in it's implentation of savestringtofile once it's saved file. in vb.net can't have derived class raise base classes event. suppose can treat xmlfilerepository_filesaved standard function call , have savestringtofile implementation call directly think i'm approaching problem wrong way. great!

add overridable sub in base class raises base classes filesaved-event:

public mustinherit class filerepository      public mustoverride sub savestringtofile(byval filetext string, byval filepath string)      public event filesaved(byval filetext string, byval filepath string)      protected overridable sub onfilesaved(byval filetext string, byval filepath string)         raiseevent filesaved(filetext, filepath)     end sub  end class  public class xmlfilerepository     inherits filerepository      public overrides sub savestringtofile(byval filetext string, byval filepath string)         mybase.onfilesaved(filetext, filepath)     end sub      private sub xmlfilerepository_filesaved(byval filetext string, byval filepath string) handles mybase.filesaved      end sub end class

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