Log4Net如何将日志按不同类型写入多个文件中

建了3个日志文件

事务日志:log.txt
错误日志:log_error.txt  
操作日志:log_event.txt

分别把日志信息写到这 3个文件中：

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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=" " />         </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=" [Header] " />           <param name="Footer" value="[Footer] " />         </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=" [Header] " />           <param name="Footer" value="[Footer] " />         </layout>         <filter type="log4net.Filter.LevelRangeFilter">           <param name="LevelMin" value="ERROR" />           <param name="LevelMax" value="ERROR" />         </filter>       </appender>     </log4net>       后台调用     log4net.ILog log = log4net.LogManager.GetLogger("Livan's Logger");   log.Info(message);   log.Warn(message);   ...         程序会分别写入不同txt文件中