Alex Rivera | Logout

Log4net appender threshold not working

Asked 2009-07-23T11:55:01.283
15

I've set up a logfileAppender and a consoleAppender in my log4net config for my application. I would like the logfile appender to only write ERROR messages and above and the console appender to write DEBUG and above.

My config is:

<log4net debug="false">

<appender name="LogFileAppender" type="log4net.Appender.FileAppender,log4net" >
  <param name="File" value="log.txt" />
  <param name="AppendToFile" value="true" />
  <layout type="log4net.Layout.PatternLayout,log4net">
    <param name="ConversionPattern" value="%d %M - %m%n" />
  </layout>
  <threshold value="ERROR"/>
</appender>

<appender name="ConsoleAppender" type="log4net.Appender.ConsoleAppender"   >
  <layout type="log4net.Layout.PatternLayout">
    <param name="ConversionPattern" value="%d %m%n" />
  </layout>
</appender>


<root>
  <priority value="DEBUG" />
  <appender-ref ref="ConsoleAppender" />
  <appender-ref ref="LogFileAppender" />
</root>

</log4net>

I'm finding that both ERROR and DEBUG is being output to my logfile appender. How to restrict it to only ERROR?

log4net log4net-configuration
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1 Answer

3

The answers you are receiving are partly correct. The Threshold is only used to set a lower limit on the level appended. A threshold of ERROR will actually receive ERROR and FATAL (which is "above" ERROR).

You do want to implement a LevelMatchFilter with a level value of "ERROR" (and "DEBUG" for the other appender). However, you must also add a DenyAllFilter to the end of your filter chain.
For example:

<appender name="LogFileAppender" type="log4net.Appender.FileAppender,log4net" >
  <param name="File" value="log.txt" />
  <param name="AppendToFile" value="true" />
  <layout type="log4net.Layout.PatternLayout,log4net">
    <param name="ConversionPattern" value="%d %M - %m%n" />
  </layout>
  <filter type="log4net.Filter.LevelMatchFilter">
    <levelToMatch value="ERROR" />
  </filter>
  <filter type="log4net.Filter.DenyAllFilter" />
</appender>

I've had to implement the DenyAllFilter since log4net 1.2.10 (you can see the question I had on this topic here).

answered 2011-01-10T22:00:00.783

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