Returns the zero-based index of the first occurrence of a IAppender in the AppenderCollection.
AppenderCollection. The zero-based index of the first occurrence of item in the entire AppenderCollection, if found; otherwise, -1.
Missing <remarks> documentation for M:log4net.Appender.AppenderCollection.IndexOf(log4net.Appender.IAppender)
AppenderCollection Class | log4net.Appender Namespace