using System;

using System.Collections.Generic;

using System.IO;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using log4net;

using log4net.Config;

namespace ConsoleLog4Net

{

    class Program

    {

        static void Main(string[] args)

        {

            var logCfg = new FileInfo(AppDomain.CurrentDomain.BaseDirectory + "log4net.config");

            XmlConfigurator.ConfigureAndWatch(logCfg);

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

            logger.Debug("Debug");

            logger.Info("Info");

            logger.Warn("Warn");

            logger.Error("Error");

            logger.Fatal("Fatal");

            Console.ReadLine();

        }

    }

}

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

<configuration>

  <configSections>

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

    <sectionGroup name="common">

      <section name="logging" type="Common.Logging.ConfigurationSectionHandler, Common.Logging"/>

    </sectionGroup>

  </configSections>

  <log4net>

    <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>

      <level value="ALL" />

      <appender-ref ref="ColoredConsoleAppender" />

    </root>

    <logger>

      <level value="ALL" />

    </logger>

  </log4net>

</configuration>