如何为log4net指定常用的应用程序数据文件夹？

<?xml version="1.0" encoding="utf-8"?><configuration>
 <configSections>
   <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" />
  </configSections>
  <log4net>
    <appender name="RollingFileAppender" type="log4net.Appender.RollingFileAppender">
      <file value="C:\Logs\MyApp" />
     <appendToFile value="true" />
     <rollingStyle value="Size" />
      <maxSizeRollBackups value="10" />
     <maximumFileSize value="10MB" />
     <staticLogFileName value="true" />
     <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%date [%thread] %-5level %logger - %message%newline" />
      </layout>
    </appender>
    <root>
     <level value="DEBUG" />
      <appender-ref ref="RollingFileAppender" />
    </root>
  </log4net>
</configuration>