Check if this filter should allow the event to be logged
see remarks
The rendered message is matched against the LoggerToMatch. If the LoggerToMatch equals the beginning of the incoming LoggerName (StartsWith) then a match will have occurred. If no match occurs this function will return Neutral allowing other filters to check the event. If a match occurs then the value of AcceptOnMatch is checked. If it is true then Accept is returned otherwise Deny is returned.
LoggerMatchFilter Class | log4net.Filter Namespace