1 <?xml version="1.0" encoding="utf-8" ?>  2 <configuration>  3     4   <configSections>  5     <section name="log4net" type="System.Configuration.IgnoreSectionHandler" />  6   </configSections>  7   8   <log4net debug="false">  9     <root> 10       <level value="ALL"/> 11       <appender-ref ref="UserLogAppender"/> 12       <appender-ref ref="SystemLogAppender"/> 13     </root> 14     <!--信息日志--> 15     <appender name="UserLogAppender" type="log4net.Appender.RollingFileAppender,log4net"> 16       <!--日志路径--> 17       <file value="./Log/"/> 18       <!--日志名格式：20151113_user.log--> 19       <param name="DatePattern" value="yyyyMMdd&quot;_user.log&quot;"/> 20       <!--是否是向文件中追加日志--> 21       <param name="AppendToFile" value="true"/> 22       <!--log保留天数--> 23       <param name="MaxSizeRollBackups" value="10"/> 24       <!--log最大文件大小--> 25       <param name="MaximumFileSize" value="5MB"/> 26       <!--日志文件名是否固定不变的--> 27       <param name="StaticLogFileName" value="false"/> 28       <!--日志根据XX滚动--> 29       <param name="RollingStyle" value="Composite"/> 30       <!--布局--> 31       <layout type="log4net.Layout.PatternLayout,log4net"> 32         <param name="ConversionPattern" value="%d [%t] %-5p %c [%x] - %m%n"/> 33         <param name="Header" value=""/> 34       </layout> 35       <filter type="log4net.Filter.LevelRangeFilter"> 36         <param name="LevelMin" value="INFO"/> 37         <param name="LevelMax" value="INFO"/> 38       </filter> 39     </appender> 40     <!--警告,注意,通知,错误日志--> 41     <appender name="SystemLogAppender" type="log4net.Appender.RollingFileAppender,log4net"> 42       <file value="./Log/"/> 43       <param name="File" value="Log\log_sys.log" /> 44       <param name="DatePattern" value="yyyyMMdd&quot;_sys.log&quot;"/> 45       <param name="AppendToFile" value="true"/> 46       <param name="RollingStyle" value="Composite"/> 47       <param name="MaxSizeRollBackups" value="10"/> 48       <param name="MaximumFileSize" value="5MB"/> 49       <param name="StaticLogFileName" value="false"/> 50       <layout type="log4net.Layout.PatternLayout,log4net"> 51         <param name="ConversionPattern" value="%d{yyyy-MM-dd HH:mm:ss}%newline%message%n"/> 52         <param name="Header" value=""/> 53       </layout> 54       <filter type="log4net.Filter.LevelRangeFilter"> 55         <param name="LevelMin" value="ERROR"/> 56         <param name="LevelMax" value="ErrOR"/> 57       </filter> 58     </appender> 59   </log4net> 60  61 </configuration>

[assembly :log4net.Config.XmlConfigurator(Watch = true)]

namespace Demo.Log4Net{    class Program    {        static void Main(string[] args)        {            ILog log = LogManager.GetLogger(typeof(LogHelper));            log.Info("info");            log.Error("error");            Console.ReadKey();        }    }}