Log4net使用方法

一、Web项目中加入log4net：

1、nuget中加入log4net

2、webconfig中的<configuration></configuration>中加入以下节点：

<configSections>
    <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,log4net" />
  </configSections>
  <log4net>
    <root>
      <level value="INFO" />
      <appender-ref ref="FileAppender" />
      <appender-ref ref="ConsoleAppender" />
    </root>
    <appender name="FileAppender" type="log4net.Appender.RollingFileAppender">
      <file value="logs\" />
      <appendToFile value="true" />
      <rollingStyle value="Composite" />
      <datePattern value="yyyy-MM-dd'.txt'" />
      <maxSizeRollBackups value="200" />
      <maximumFileSize value="10485760" />
      <staticLogFileName value="false" />
      <layout type="log4net.Layout.PatternLayout">
        <header value="[Header] " />
        <footer value="[Footer] " />
        <conversionPattern value="%date %-5level %logger - %message%newline" />
      </layout>
    </appender>
    <appender name="ConsoleAppender" type="log4net.Appender.ConsoleAppender">
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%date [%thread] %-5level %logger - %message%newline" />
      </layout>
    </appender>
  </log4net>

3、在Global.asax.cs中加入：

 log4net.Config.XmlConfigurator.Configure();

二、控制台中加入log4net

    1、app.config中加入节点：

  <configSections>
    <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,log4net" />
  </configSections>
  <log4net>
    <root>
      <level value="INFO" />
      <appender-ref ref="FileAppender" />
      <appender-ref ref="ConsoleAppender" />
    </root>
    <appender name="FileAppender" type="log4net.Appender.RollingFileAppender">
      <file value="logs\" />
      <appendToFile value="true" />
      <rollingStyle value="Composite" />
      <datePattern value="yyyy-MM-dd'.txt'" />
      <maxSizeRollBackups value="200" />
      <maximumFileSize value="10485760" />
      <staticLogFileName value="false" />
      <layout type="log4net.Layout.PatternLayout">
        <header value="[Header] " />
        <footer value="[Footer] " />
        <conversionPattern value="%date %-5level %logger - %message%newline" />
      </layout>
    </appender>
    <appender name="ConsoleAppender" type="log4net.Appender.ConsoleAppender">
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%date [%thread] %-5level %logger - %message%newline" />
      </layout>
    </appender>
  </log4net>

2、AssemblyInfo.cs 中最后加入这句：

[assembly: log4net.Config.XmlConfigurator(ConfigFileExtension = "config", Watch = true)]

3、实际使用：

   log4net.ILog logInfo = log4net.LogManager.GetLogger("loginfo");
            logInfo.Info("测试日志写入");
            Console.WriteLine("日志写入文件完成");
            Console.ReadLine();