Question

I copied the log4net samples to implement a custom log level, AUDIT. I defined AUDIT to have a value of 35000, between DEBUG 30000 and INFO 40000.

The following is my configuration section. I have one appender that logs all levels and one that is supposed to log only AUDIT levels (this is just for testing)

<log4net>   <appender name='FileAppender' type='log4net.Appender.FileAppender' >     <file value='testrun.log' />     <layout type='log4net.Layout.PatternLayout' >       <conversionPattern value='%date{HH:mm:ss:fff} [%thread] %-5level %logger{1} - %message%newline' />     </layout>   </appender>   <appender name='FileAppender.Audit' type='log4net.Appender.FileAppender' >     <filter type='log4net.Filter.LevelMatchFilter'>       <levelToMatch value='AUDIT' />     </filter>     <file value='testrun.audit.log' />     <layout type='log4net.Layout.PatternLayout' >       <conversionPattern value='%date{HH:mm:ss:fff} [%thread] %-5level %logger{1} - %message%newline' />     </layout>   </appender>     <root>     <level value='ALL' />     <appender-ref ref='FileAppender' />     <appender-ref ref='FileAppender.Audit' />   </root> </log4net> 

The test method is

private static readonly IAuditLog log = AuditLogManager.GetLogger(typeof(Program)); public static void Main() {     log.Debug('Debug');     log.Audit('Audit');     log.Info('Info'); } 

However, the output of the appenders is the same…

13:09:11:540 [9] DEBUG Program - Debug 13:09:11:560 [9] AUDIT Program - Audit 13:09:11:560 [9] INFO  Program - Info 

The log4net debug output when parsing the LevelMatchFilter is

log4net: Loading Appender [FileAppender.Audit] type: [log4net.Appender.FileAppender] log4net:ERROR XmlHierarchyConfigurator: Unknown Level Specified [AUDIT] log4net:WARN Unable to set property [levelToMatch] on object [log4net.Filter.LevelMatchFilter] using value [AUDIT] (with acceptable conversion types) log4net: Setting Collection Property [AddFilter] to object [log4net.Filter.LevelMatchFilter] 

Answer 1

log4net version 1.2.10 requires that you end a LevelMatchFilter chain with a DenyAllFilter if you want the behavior I described in the question.

<appender name='FileAppender.Audit' type='log4net.Appender.FileAppender' >   <filter type='log4net.Filter.LevelMatchFilter'>     <levelToMatch value='AUDIT' />   </filter>   <filter type='log4net.Filter.DenyAllFilter' />   <file value='testrun.audit.log' />   <layout type='log4net.Layout.PatternLayout' >     <conversionPattern value='%date{HH:mm:ss:fff} [%thread] %-5level %logger{1} - %message%newline' />   </layout> </appender>