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<log4net>
    <root>
      <!--
            <level value="ALL" />
            <appender-ref ref="rootFile" />
            -->
    </root>
    <logger name="Livan's Logger">
      <level value="ALL" />
      <appender-ref ref="Loging" />
      <appender-ref ref="EventLoging"/>
      <appender-ref ref="ErrorLoging" />
    </logger>
    <!--信息日志-->
    <appender name="Loging" type="log4net.Appender.RollingFileAppender,log4net" >
      <param name="File" value="Log\log.txt" />
      <param name="AppendToFile" value="true" />
      <param name="RollingStyle" value="Date" />
      <param name="DatePattern" value="yyyyMMdd" />
      <param name="StaticLogFileName" value="true" />
      <layout type="log4net.Layout.PatternLayout,log4net">
        <param name="ConversionPattern" value="%d [%t] %-5p %c [%x] - %m%n"  />
        <param name="Header" value="&#13;&#10;" />
      </layout>
      <filter type="log4net.Filter.LevelRangeFilter">
        <param name="LevelMin" value="INFO" />
        <param name="LevelMax" value="INFO" />
      </filter>
    </appender>
    <!--警告,注意,通知日志-->
    <appender name="EventLoging" type="log4net.Appender.RollingFileAppender,log4net" >
      <param name="File" value="Log\log_event.txt" />
      <param name="AppendToFile" value="true" />
      <param name="RollingStyle" value="Date" />
      <param name="DatePattern" value="yyyyMMdd" />
      <param name="StaticLogFileName" value="true" />
      <layout type="log4net.Layout.PatternLayout,log4net">
        <param name="ConversionPattern" value="%d{yyyy-MM-dd HH:mm:ss}%newline%message%n" />
        <param name="Header" value="&#13;&#10;[Header]&#13;&#10;" />
        <param name="Footer" value="[Footer]&#13;&#10;" />
      </layout>
      <filter type="log4net.Filter.LevelRangeFilter">
        <param name="LevelMin" value="WARN" />
        <param name="LevelMax" value="WARN" />
      </filter>
    </appender>
    <!--错误日志-->
    <appender name="ErrorLoging" type="log4net.Appender.RollingFileAppender,log4net" >
      <param name="File" value="Log\log_error.txt" />
      <param name="AppendToFile" value="true" />
      <param name="RollingStyle" value="Date" />
      <param name="DatePattern" value="yyyyMMdd" />
      <param name="StaticLogFileName" value="true" />
      <layout type="log4net.Layout.PatternLayout,log4net">
        <param name="ConversionPattern" value="%d{yyyy-MM-dd HH:mm:ss}%newline%message%n" />
        <param name="Header" value="&#13;&#10;[Header]&#13;&#10;" />
        <param name="Footer" value="[Footer]&#13;&#10;" />
      </layout>
      <filter type="log4net.Filter.LevelRangeFilter">
        <param name="LevelMin" value="ERROR" />
        <param name="LevelMax" value="ERROR" />
      </filter>
    </appender>
  </log4net>

调用方法:

log4net.ILog log = log4net.LogManager.GetLogger("Livan's Logger");
log.Info(message);
log.Warn(message);
...