<?xml version="1.0" encoding="utf-8" ?>

 <configuration>

   <configSections>

     <!--添加配置节点-->

     <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" />

   </configSections>

   <log4net>

     <!--日志保存到文件里面 txt-->

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

       <mapping>

         <level value="ERROR" />

         <foreColor value="White" />

         <backColor value="Red,HighIntensity" />

       </mapping>

       <mapping>

         <level value="DEBUG" />

         <backColor value="Green" />

       </mapping>

       <mapping>

         <level value="Info" />

         <backColor value="Yellow" />

       </mapping>

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

         <conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" />

       </layout>

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

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

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

       </filter>

     </appender>

     <root>

       <!--配置可输出日志级别-->

       <level value="all"/>

       <!--应用配置-->

       <appender-ref ref="ColoredConsoleAppender"/>

     </root>

   </log4net>

 </configuration>

 using System;

 using System.Collections.Generic;

 using System.Linq;

 using System.Text;

 using log4net;

 namespace 控制台输出日志

 {

     class Program

     {

         static void Main(string[] args)

         {

             //初始化log4net配置

             log4net.Config.XmlConfigurator.Configure();

             ILog log = LogManager.GetLogger(typeof(Program));

             log.Info("普通日志");

             log.Error("错误日志");

             log.Debug("异常信息");

             log.Fatal("致命错误");

             log.Warn("警告信息");

             Console.ReadKey();

         }

     }

 }