使用log4net 历经纠结, 却也**从没有享受过纠结的好处**!

0:log4net_most_simple_sample.md

AssemblyInfo.cs

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

log4net.config

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <!--添加log4net自定义节点-->
  <configSections>
    <section name="log4net" type="System.Configuration.IgnoreSectionHandler"/>
  </configSections>
  <log4net>
    <appender name="FileAppender" type="log4net.Appender.FileAppender">
      <!--文件路径-->
      <file value="D:\logs\log.txt"/>
      <rollingStyle value="Date" />
      <appendToFile value="true"/>
      <!--显示格式-->
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline"/>
      </layout>
    </appender>
    <root>
      <appender-ref ref="FileAppender"/>
    </root>
  </log4net>
</configuration>

Logger.cs

using log4net;

// todo: change namespace name
namespace Ibags.API.App_Start
{
    public class Logger
    {
        private static ILog instance;
        public static ILog Instance()
        {
            if (instance == null)
            {
                instance = log4net.LogManager.GetLogger(
                    System.Reflection.MethodBase.GetCurrentMethod().DeclaringType
                );
            }
            instance.Info("Logger has a new instance. ");
            return instance;
        }

        private Logger() { }
    }
}