log4net仪表板上的该线程详细介绍了一种方法。
总结一下，希望不要剥离太多代码：
using log4net;using log4net.Appender;using log4net.Layout;using log4net.Repository.Hierarchy;// Set the level for a named loggerpublic static void SetLevel(string loggerName, string levelName){ ILog log = LogManager.GetLogger(loggerName); Logger l = (Logger)log.Logger; l.Level = l.Hierarchy.LevelMap[levelName]; }// Add an appender to a loggerpublic static void AddAppender(string loggerName, IAppender appender){ ILog log = LogManager.GetLogger(loggerName); Logger l = (Logger)log.Logger; l.AddAppender(appender);}// Create a new file appenderpublic static IAppender CreateFileAppender(string name, string fileName){ FileAppender appender = new FileAppender(); appender.Name = name; appender.File = fileName; appender.AppendToFile = true; PatternLayout layout = new PatternLayout(); layout.ConversionPattern = "%d [%t] %-5p %c [%x] - %m%n"; layout.ActivateOptions(); appender.Layout = layout; appender.ActivateOptions(); return appender;}// In order to set the level for a logger and add an appender reference you// can then use the following calls:SetLevel("Log4net.MainForm", "ALL");AddAppender("Log4net.MainForm", CreateFileAppender("appenderName", "fileName.log"));// repeat as desired
