Qfyilyi

I am trying to create mulitple appenders each logging only certain messages. Filtering should be performed based on the selected property set to the ThreadContext. What I did is as follows (log4net.config)

<?xml version="1.0" encoding="utf-8"?>

<configuration>

  <configSections>

    <section name="log4net" type="System.Configuration.IgnoreSectionHandler" />

  </configSections>

  <log4net>



    <appender name="FileAppender" type="log4net.Appender.RollingFileAppender">

      <file value="MyLog_"/>

      <appendToFile value="true"/>

      <rollingStyle value="Composite"/>

      <datePattern value="yyyy-MM-dd.log"/>

      <maximumFileSize value="100MB"/>

      <staticLogFileName value="false"/>

      <layout type="log4net.Layout.PatternLayout">

        <conversionPattern value="%date{HH:mm:ss.fff} [%4thread] [%property{Category}] %-5level %logger - %message%newline"/>

      </layout>

      <filter type="log4net.Filter.PropertyFilter">

        <Key value="Category" />

        <StringToMatch value="3" />

        <acceptOnMatch value="true" />

      </filter>

    </appender>



    <appender name="SecurityFileAppender" type="log4net.Appender.RollingFileAppender">

      <file value="MyLog_Security_"/>

      <appendToFile value="true"/>

      <rollingStyle value="Composite"/>

      <datePattern value="yyyy-MM-dd.log"/>

      <maximumFileSize value="100MB"/>

      <staticLogFileName value="false"/>

      <layout type="log4net.Layout.PatternLayout">

        <conversionPattern value="%date{HH:mm:ss.fff} [%4thread] [%property{Category}] %-5level %logger - %message%newline"/>

      </layout>

      <filter type="log4net.Filter.PropertyFilter">

        <key value="Category" />

        <stringToMatch value="1" />

        <acceptOnMatch value="true" />

      </filter>

    </appender>



    <root>

      <level value="ALL" />

      <appender-ref ref="FileAppender" />

      <appender-ref ref="SecurityFileAppender" />

    </root>



  </log4net>

</configuration>

In order to set the property value prior to logging a message I issue the following line of code:

    log4net.ThreadContext.Properties["Category"] = "3";

    _log.Info("Normal info");

    log4net.ThreadContext.Properties["Category"] = "1";

    _log.Info("Security info");

I tried configuring log4net with and without 'acceptOnMatch'.
In each case seems like the filter by thread context isn't working. Both messages appear in both files.

How should I fix the configuration in order to make filter by thread context property working? Is it doable at all?

Thanks, Radek

To fix it I needed to add second filter configuration beneath each filter already defined as follows:

<filter type="log4net.Filter.DenyAllFilter" />

This makes the filter above working. Strange but this is how it works.

Example fixed appender looks like this:

<appender name="SecurityFileAppender" type="log4net.Appender.RollingFileAppender">

   ...

      <file value="MyLog_Security_"/>

      <filter type="log4net.Filter.PropertyFilter">

        <key value="Category" />

        <stringToMatch value="1" />

        <acceptOnMatch value="true" />

      </filter>

      <filter type="log4net.Filter.DenyAllFilter" />

    </appender>