demo地址：https://github.com/PuzzledAlien/log4net_demo

准备

• log4net 最新版本是2.0.8
• VS2017
• .Net Core 2.2
• 测试电脑配置 windows10 64位 4核CPU 16G内存

log4net官网引导文档 ：http://logging.apache.org/log4net/release/manual/introduction.html

配置和代码

log4net.config配置如下

<?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">

      <!--日志路径-->

      <param name= "File" value= ".\App_Log\servicelog\"/>

      <!--是否是向文件中追加日志-->

      <param name= "AppendToFile" value= "true"/>

      <!--log保留天数-->

      <param name= "MaxSizeRollBackups" value= "10"/>

      <!--每个log文件最大是2M，如果超过2M将重新创建一个新的log文件，并将原来的log文件备份。-->

      <maximumFileSize value="2MB" />

      <!--日志文件名是否是固定不变的-->

      <param name= "StaticLogFileName" value= "false"/>

      <!--日志文件名格式为:2008-08-31-12.log-->

      <param name= "DatePattern" value= "yyyy-MM-dd-HH-mm&quot;.read.log&quot;"/>

      <!--日志根据日期滚动-->

      <param name= "RollingStyle" value= "Date"/>

      <layout type="log4net.Layout.PatternLayout">

        <param name="ConversionPattern" value="%d [%t] %-5p %c - %m%n %loggername" />

      </layout>

      <lockingModel type="log4net.Appender.FileAppender+MinimalLock" />

    </appender>

    <!-- 控制台前台显示日志 -->

    <appender name="ManagedColoredConsoleAppender" type="log4net.Appender.ManagedColoredConsoleAppender">

      <mapping>

        <level value="ERROR" />

        <foreColor value="Red" />

      </mapping>

      <mapping>

        <level value="Info" />

        <foreColor value="Green" />

      </mapping>

      <mapping>

        <level value="DEBUG" />

        <foreColor value="Blue" />

      </mapping>

      <mapping>

        <level value="WARN" />

        <foreColor value="Yellow" />

      </mapping>

      <layout type="log4net.Layout.PatternLayout">

        <conversionPattern value="%n%date{HH:mm:ss,fff} [%-5level] %m" />

      </layout>

      <filter type="log4net.Filter.LevelRangeFilter">

        <param name="LevelMin" value="DEBUG" />

        <param name="LevelMax" value="Fatal" />

      </filter>

    </appender>

    <root>

      <!--(高) OFF > FATAL > ERROR > WARN > INFO > DEBUG > ALL (低) -->

      <level value="ALL" />

      <appender-ref ref="ManagedColoredConsoleAppender"/>

      <appender-ref ref="RollingLogFileAppender"/>

    </root>

  </log4net>

</configuration>

添加引用

using log4net;

using log4net.Config;

using log4net.Repository;

代码如下：

        private static ILoggerRepository _loggerRepository;

        static void Main(string[] args)

        {

            _loggerRepository = LogManager.CreateRepository("ConsoleApp3");

            XmlConfigurator.ConfigureAndWatch(_loggerRepository, new FileInfo("log4net.config"));

            var log = LogManager.GetLogger(_loggerRepository.Name, typeof(Program));

            const int numberOfCycles = 20000;

            var sw = Stopwatch.StartNew();

            for (var i = 0; i < numberOfCycles; i++)

            {

                log.InfoFormat("testNum: {0} ", i);

            }

            sw.Stop();

            Console.WriteLine();

            Console.WriteLine("Ellapsed: {0}, numPerSec: {1}", sw.ElapsedMilliseconds, numberOfCycles / (sw.ElapsedMilliseconds / (double)1000));

            Console.WriteLine("Hello World!");

            Console.ReadKey();

        }

执行结果：

本地写log文本日志和Console打印日志的时间14720毫秒 一秒钟写日志1359条

Ellapsed: 14720, numPerSec: 1358.69565217391