1.web网站中创建log4net.config

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

<configuration>   <configSections>     <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" />   </configSections>   <log4net>     <appender name="RollingFileAppender" type="log4net.Appender.RollingFileAppender">       <file value="log/log.txt" />       <appendToFile value="true" />       <rollingStyle value="Size" />       <maxSizeRollBackups value="1000" />       <maximumFileSize value="1024KB" />       <staticLogFileName value="true" />       <layout type="log4net.Layout.PatternLayout">         <conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" />       </layout>       <filter type="log4net.Filter.LevelMatchFilter">         <param name="LevelToMatch" value="INFO" />       </filter>     </appender>     <appender name="RollingErrorFileAppender" type="log4net.Appender.RollingFileAppender">       <file value="log/error_log.txt" />       <appendToFile value="true" />       <rollingStyle value="Size" />       <maxSizeRollBackups value="1000" />       <maximumFileSize value="1024KB" />       <staticLogFileName value="true" />       <layout type="log4net.Layout.PatternLayout">         <conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" />       </layout>       <filter type="log4net.Filter.LevelRangeFilter">         <levelMin value="WARN" />         <levelMax value="FATAL" />       </filter>     </appender>     <root>       <level value="INFO" />       <appender-ref ref="RollingFileAppender" />     </root>     <logger name="AccountInfoLogger">       <appender-ref ref="RollingFileAppender"/>       <appender-ref ref="RollingErrorFileAppender"/>       <level value="INFO"/>     </logger>   </log4net>        <system.web>       <compilation debug="true" targetFramework="4.0" />     </system.web> </configuration> 2.调用日志的类库或web的AssemblyInfo.cs中添加组件

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

3.调用

logger.Error("", ex);