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https://issues.apache.org/jira/browse/LOG4NET-137?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12564313#action_12564313
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Ron Grabowski commented on LOG4NET-137:
---------------------------------------

A better place for general questions about log4net is the mailing lists. 

I suspect you need to add a DenyAllFilter to the end of the filter chain for 
your EventLog appender:

 <filter type="log4net.Filter.LevelMatchFilter">
 <levelToMatch value="FATAL" /> 
 </filter> 
 <filter type="log4net.Filter.DenyAllFilter" />

A more efficient way of specifying that you only way FATAL messages is to set 
the threshold on the appender:

 <appender name="EventLog" type="log4net.Appender.EventLogAppender" >
  <applicationName value="SQLNotifyApp" />
  <layout type="log4net.Layout.PatternLayout">
  <conversionPattern" value="%d{yyyyMMdd:HHmmss.fffff} [%t] %-5p %c %x - %m%n" 
/>
  </layout>
  <threshold value="FATAL" />
 </appender> 

The threshold property is checked before the appender starts rendering the 
message so non-FATAL messages will be discarded sooner.

> log4net.Filter.LevelMatchFilter does not work anymore
> -----------------------------------------------------
>
>                 Key: LOG4NET-137
>                 URL: https://issues.apache.org/jira/browse/LOG4NET-137
>             Project: Log4net
>          Issue Type: Bug
>          Components: Other
>    Affects Versions: 1.2.10
>            Reporter: Benjamin Peikes
>
> The following log4net configuration used to filter only FATAL messages to the 
> event log. In version 1.2.10, this will send all messages to the EventLog. If 
> I remove the LevelMatchFilter and replace it with a LevelRangeFilter which 
> has a minLevel set to FATAL, the filtering occurs properly.
>       <log4net>
>               <root>
>                       <level value="Info" />
>                       <appender-ref ref="All" />                      
>                       <appender-ref ref="Error" />
>                       <appender-ref ref="EventLog" />
>                       <!-- <appender-ref ref="Console" /--> 
>               </root>                         
>               <appender name="EventLog" 
> type="log4net.Appender.EventLogAppender" >
>                       <param name="ApplicationName" value="SQLNotifyApp" />
>                       <layout type="log4net.Layout.PatternLayout">
>                               <param name="ConversionPattern" 
> value="%d{yyyyMMdd:HHmmss.fffff} [%t] %-5p %c %x - %m%n" /> 
>                       </layout>
>                       <filter type="log4net.Filter.LevelMatchFilter">
>                               <param name="LevelToMatch" value="FATAL" />
>                       </filter>
>               </appender>             
>               <appender name="Error" 
> type="log4net.Appender.RollingFileAppender">
>                       <file value="SQLNotifyApp_Error.log" />
>                       <appendToFile value="true" />
>                       <rollingStyle value="Date" />
>                       <datePattern value="yyyyMMdd" />
>                       <filter type="log4net.Filter.LevelMatchFilter">
>                               <param name="LevelToMatch" value="ERROR" />
>                       </filter>
>                       <layout type="log4net.Layout.PatternLayout" >
>                               <param name="conversionPattern" 
> value="%d{yyyyMMdd:HHmmss.fffff} [%t] %-5p %c %x - %m%n" />
>                       </layout>
>               </appender>             
>               
>               <appender name="All" 
> type="log4net.Appender.RollingFileAppender">
>                       <file value="SQLNotifyApp_All.log" />
>                       <appendToFile value="true" />
>                       <rollingStyle value="Date" />
>                       <datePattern value="yyyyMMdd" />
>                       <layout type="log4net.Layout.PatternLayout" >
>                               <param name="conversionPattern" 
> value="%d{yyyyMMdd:HHmmss.fffff} [%t] %-5p %c %x - %m%n" />
>                       </layout>
>               </appender>                             
>               <appender name="Console" 
> type="log4net.Appender.ConsoleAppender">
>                       <layout type="log4net.Layout.PatternLayout" >
>                               <param name="conversionPattern" 
> value="%d{yyyyMMdd:HHmmss.fffff} [%t] %-5p %c %x - %m%n" />
>                       </layout>
>               </appender>                                     
>       </log4net>

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