1.Install-Package log4net
2.命名空间前添加XmlConfiguratorAttribute标记：[assembly: log4net.Config.XmlConfigurator(Watch = true)],或添加到AssemblyInfo.cs
3.web.config配置
在<configuration></configuration>里添加,
<configSections> ???<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/> ???<!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 --> ???????<section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" /> ???<section name="oracle.manageddataaccess.client" type="OracleInternal.Common.ODPMSectionHandler, Oracle.ManagedDataAccess, Version=4.122.1.0, Culture=neutral, PublicKeyToken=89b483f429c47342" /> ?</configSections> ?<log4net> ???<appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender"> ?????<!--日志路径--> ?????<param name= "File" value= "D:\\log\\"/> ?????<!--是否是向文件中追加日志--> ?????<param name= "AppendToFile" value= "true"/> ?????<!--log保留天数--> ?????<param name= "MaxSizeRollBackups" value= "10"/> ?????<!--日志文件名是否是固定不变的--> ?????<param name= "StaticLogFileName" value= "false"/> ?????<!--日志文件名格式为:2017-07-25.log--> ?????<param name= "DatePattern" value= "yyyy-MM-dd".log""/> ?????<!--日志根据日期滚动--> ?????<param name= "RollingStyle" value= "Date"/> ?????<!--日志文本格式--> ?????<layout type="log4net.Layout.PatternLayout"> ???????<!--例：2017-07-25 10:56:15,506 [9] INFO ?Log4NetSample.Program 18 - 消息 --> ???????<!--%d ?时间--> ???????<!--%t ?线程--> ???????<!--%-5p ?日志级别--> ???????<!--%c ?出错类--> ???????<!--%L ?出错行--> ???????<!--%m ?日志信息--> ???????<!--%n ?换行--> ???????<param name="ConversionPattern" value="%d [%t] %-5p %c %L - %m %n" /> ?????</layout> ???</appender> ???<root> ?????<!--(高) OFF > FATAL > ERROR > WARN > INFO > DEBUG > ALL (低) --> ?????<level value="all" /> ?????<appender-ref ref="RollingLogFileAppender"/> ???</root> ?</log4net>
4.使用
var log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType); ???????????log.Info("消息"); ???????????log.Warn("警告"); ???????????log.Error("异常"); ???????????log.Fatal("错误");5.结果
参考https://www.cnblogs.com/Answer-Geng/p/7229155.html
Log4Net配置
原文地址：https://www.cnblogs.com/venje/p/9233352.html