【注意项目名称不要为log4net，否者在之后配置log4net出错】
1】NuGet中引用Log4net包
2】在web.config中添加以下两段代码
<configSections> <!--配置log4net--> <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" /> </configSections> <!--配置log4net--> <log4net> <!-- OFF, FATAL, ERROR, WARN, INFO, DEBUG, ALL --> <!-- Set root logger level to ERROR and its appenders --> <root> <level value="ALL" /> <appender-ref ref="SysAppender" /> </root> <!-- Print only messages of level DEBUG or above in the packages --> <logger name="WebLogger"> <level value="DEBUG" /> </logger> <appender name="SysAppender" type="log4net.Appender.RollingFileAppender,log4net"> <param name="File" value="App_Data/" /> <param name="AppendToFile" value="true" /> <param name="RollingStyle" value="Date" /> <param name="DatePattern" value=""Logs_"yyyyMMdd".txt"" /> <param name="StaticLogFileName" value="false" /> <layout type="log4net.Layout.PatternLayout,log4net"> <param name="ConversionPattern" value="%d [%t] %-5p %c - %m%n" /> </layout> </appender> <appender name="consoleApp" type="log4net.Appender.ConsoleAppender,log4net"> <layout type="log4net.Layout.PatternLayout,log4net"> <param name="ConversionPattern" value="%d [%t] %-5p %c - %m%n" /> </layout> </appender> </log4net>