[C#][Log4Net] 配置

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <configSections>
    <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,log4net" />
  </configSections>

  <log4net>
    <appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">
      <file value="Log\log.txt" />
      <appendToFile value="true" />
      <maxSizeRollBackups value="10" />
      <maximumFileSize value="1024KB" />
      <rollingStyle value="Size" />
      <staticLogFileName value="true" />
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%date [%thread] %-5level %logger - %message%newline" />
      </layout>
    </appender>
    <root>
      <!-- OFF FATAL ERROR WARN INFO DEBUG ALL -->
      <level value="ALL" />
      <appender-ref ref="RollingLogFileAppender" />
    </root>
  </log4net>
</configuration>

// 从配置文件读取 log4net 配置
log4net.Config.XmlConfigurator.Configure();
ILog logWriter = log4net.LogManager.GetLogger("Form1");
logWriter.Info("User Click!");

 这个是限制最多只有 四个日志文件，每文件最大 133KB 的写法

<?xml version="1.0" encoding="utf-8" ?>
<log4net>
    <!-- https://www.cnblogs.com/congqiandehoulai/p/15254373.html -->
    <appender name="RollingFileAppender" type="log4net.Appender.RollingFileAppender">
        <file value="logs\logs.txt"/>
        <appendToFile value="true"/>
        <rollingStyle value="Size"/>
        <maxSizeRollBackups value="3" />
        <maximumFileSize value="100KB" />
        <staticLogFileName value="true"/>
        <lockingModel type="log4net.Appender.FileAppender+MinimalLock" />
        <layout type="log4net.Layout.PatternLayout">
            <param name="ConversionPattern" value="%d [%t] %-5p %c - %m%n"/>
        </layout>
        <filter type="log4net.Filter.LevelRangeFilter">
            <param name="LevelMax" value="DEBUG" />
        </filter>
    </appender>
    <appender name="LogFileAppender" type="log4net.Appender.RollingFileAppender">
        <file value="logs\"/>
        <appendToFile value="true"/>
        <rollingStyle value="Date"/>
        <datePattern value="yyyy-MM-dd'.txt'"/>
        <staticLogFileName value="false"/>
        <lockingModel type="log4net.Appender.FileAppender+MinimalLock" />
        <layout type="log4net.Layout.PatternLayout">
            <param name="ConversionPattern" value="%d [%t] %-5p %c - %m%n"/>
        </layout>
        <filter type="log4net.Filter.LevelRangeFilter">
            <param name="LevelMin" value="DEBUG" />
        </filter>
    </appender>
    <root>
        <!-- ALL > FATAL > ERROR > WARN > INFO > DEBUG > OFF -->
        <appender-ref ref="RollingFileAppender"/>
        <appender-ref ref="LogFileAppender"/>
    </root>
</log4net>