Configure log4net to send errors to different appenders based on level

Question

I want to send Info Level & above to the XML appender and Error/Fatal Level to the EventLog appender.

I gather that I need to modify the root element of the config but I'm struggling with the syntax. What is the configuration syntax to direct logs to the correct appender for a given level or range of levels?

This is the configuration so far:

<log4net>
  <appender name="SomeXmlAppender" type="log4net.Appender.RollingFileAppender">
    ...
  </appender>
  <appender name="SomeEventLogAppender" type="log4net.Appender.EventLogAppender">
    ...
  </appender>
  <root>
    <level value="DEBUG" />
    <appender-ref ref="SomeXmlAppender" />
    <appender-ref ref="SomeEventLogAppender" />
  </root>
</log4net>

Edit: Thanks @agileguy. That post did indeed contain the syntaxt I needed. The working solution now looks like this:

<log4net>
  <appender name="SomeXmlAppender" type="log4net.Appender.RollingFileAppender">
    ...
    <evaluator type="log4net.Core.LevelEvaluator">
      <threshold value="INFO"/>
    </evaluator>
    <filter type="log4net.Filter.LevelRangeFilter">
      <levelMin value="INFO" />
      <acceptOnMatch value="true" />
    </filter>
    <filter type="log4net.Filter.DenyAllFilter" />
  </appender>
  <appender name="SomeEventLogAppender" type="log4net.Appender.EventLogAppender">
    ...
    <evaluator type="log4net.Core.LevelEvaluator">
      <threshold value="ERROR"/>
    </evaluator>
    <filter type="log4net.Filter.LevelRangeFilter">
      <levelMin value="ERROR" />
      <acceptOnMatch value="true" />
    </filter>
    <filter type="log4net.Filter.DenyAllFilter" />
  </appender>
  <root>
    <level value="DEBUG" />
    <appender-ref ref="SomeXmlAppender" />
    <appender-ref ref="SomeEventLogAppender" />
  </root>
</log4net>

Answer 1

I think Mr Graham's article here will get you going.

Kindness,

Dan