某些业务需要根据不同的功能将日志记录到不同的位置，以便于区分。
<?xml version="1.0" encoding="utf-8" ?><log4net> ?<appender name="Console" type="log4net.Appender.ConsoleAppender"> ???<layout type="log4net.Layout.PatternLayout"> ?????<!-- Pattern to output the caller‘s file name and line number --> ?????<conversionPattern value="%5level [%thread] (%file:%line) - %date - %message%newline" /> ???</layout> ?</appender> ?<appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender"> ???<file type="log4net.Util.PatternString" value="Logs\\Common\\%date{yyyy-MM-dd}.log" /> ???<appendToFile value="true" /> ???<rollingStyle value="Composite" /> ???<datePattern value="yyyyMMdd" /> ???<maxSizeRollBackups value="10" /> ???<maximumFileSize value="1KB" /> ???<layout type="log4net.Layout.PatternLayout"> ?????<conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" /> ???</layout> ?</appender> ?<appender name="EventLoggerAppender" type="log4net.Appender.RollingFileAppender"> ???<file type="log4net.Util.PatternString" value="Logs\\Events\\%date{yyyy-MM-dd}.log" /> ???<appendToFile value="true" /> ???<rollingStyle value="Composite" /> ???<datePattern value="yyyyMMdd" /> ???<maxSizeRollBackups value="10" /> ???<maximumFileSize value="1KB" /> ???<layout type="log4net.Layout.PatternLayout"> ?????<conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" /> ???</layout> ?</appender> ?<logger name="FileLogger"> ???<level value="ALL" /> ???<appender-ref ref="RollingLogFileAppender" /> ?</logger> ?<logger name="EventLogger"> ???<level value="ALL" /> ???<appender-ref ref="EventLoggerAppender" /> ?</logger> ?<!-- <root> --> ?<!-- ??<level value="DEBUG" /> --> ?<!-- ??<appender-ref ref="RollingLogFileAppender" /> --> ?<!-- ??<appender-ref ref="Console" /> --> ?<!-- </root> --></log4net>日志工具类（这里只是简单的封装）：
public static class LogHelper{ ???private static readonly ILog logger = LogManager.GetLogger("FileLogger"); ???private static readonly ILog eventLogger = LogManager.GetLogger("EventLogger"); ???static LogHelper() ???{ ???????log4net.Config.XmlConfigurator.Configure(new FileInfo(HttpContext.Current.Server.MapPath("~/log4net.config"))); ???} ???public static void Error(string errMessage) ???{ ???????logger.Error(errMessage); ???} ???public static void LogEvent(string errMessage) ???{ ???????eventLogger.Error(errMessage); ???}}public class HomeController : Controller{ ???public ActionResult Index() ???{ ???????LogHelper.Error("出错啦"); ???????LogHelper.LogEvent("fafdsafdsaff"); ???????ViewBag.Title = "Home Page"; ???????return View(); ???}}浏览页面后，可以看到日志目录如下：
参考资料：https://stackoverflow.com/questions/11930381/log4net-multiple-appenders-writing-to-event-viewer
log4net 写入日志到不同的位置
原文地址：https://www.cnblogs.com/godbell/p/9368881.html