<?xml version="1.0" encoding="utf-8" ?> <log4net> <appender name="errorAppender" type="log4net.Appender.RollingFileAppender"> <filter type="log4net.Filter.LevelMatchFilter"> <levelToMatch value="ERROR" /> </filter> <filter type="log4net.Filter.DenyAllFilter" /> <File value="Logs\err.log" /> <appendToFile value="true" /> <rollingStyle value="Date" /> <datePattern value="yyyyMMdd" /> <layout type="log4net.Layout.PatternLayout"> <conversionPattern value="%date [%thread] %-5level %logger - %message%newline" /> </layout> </appender> <appender name="infoAppender" type="log4net.Appender.RollingFileAppender"> <filter type="log4net.Filter.LevelMatchFilter"> <levelToMatch value="INFO" /> </filter> <filter type="log4net.Filter.DenyAllFilter" /> <File value="Logs\info.log" /> <appendToFile value="true" /> <rollingStyle value="Date" /> <datePattern value="yyyyMMdd" /> <layout type="log4net.Layout.PatternLayout"> <conversionPattern value="%date [%thread] %-5level %logger - %message%newline" /> </layout> </appender> <appender name="debugAppender" type="log4net.Appender.RollingFileAppender"> <filter type="log4net.Filter.LevelMatchFilter"> <levelToMatch value="DEBUG" /> </filter> <filter type="log4net.Filter.DenyAllFilter" /> <File value="Logs\debug.log" /> <appendToFile value="true" /> <rollingStyle value="Date" /> <datePattern value="yyyyMMdd" /> <layout type="log4net.Layout.PatternLayout"> <conversionPattern value="%date [%thread] %-5level %logger - %message%newline" /> </layout> </appender> <root> <level value="ALL" /> <appender-ref ref="errorAppender" /> <appender-ref ref="infoAppender" /> <appender-ref ref="debugAppender" /> </root> </log4net>
使用方法：
1. 程序启动时载入配置
log4net.Config.XmlConfigurator.Configure(new FileInfo(AppDomain.CurrentDomain.BaseDirectory+@"configs\log4net.config"));
web在 global.asax,win在 program.cs
2.使用
public static ILog Logger = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType); Logger.Info(Exception ex); Logger.Error();
原文：http://www.cnblogs.com/hualiu0/p/4571794.html