最近项目使用到log4net来记录日志,当然二话不说先到cnblogs上查看一下各位高手关于log4net的教程和心得
主要参看了 的 (确实是非常好的log4net的入门指南),在此篇文章的评论中@所罗门 有个问题可能摩诘比较忙没有时间去是实验和解答,问题如下:如果我在配置文件里不设定Appender的File，即删除了<param name="File" value="log-file.txt" /> 一行信息，我想要在程序运行时动态的设定log日志的文件名(例如以日期来作文件名)，该怎么处理才能实现 刚好项目也需要动态的更改log的文件名,就尝试着去跟踪一下log4net的写日志的过程,看看它是如果写日志的.在跟踪的工程中发现log4net.Repository.Hierarchy.Logger类下面有Appenders属性,就是返回当前所有的append集合,刚好通过调试跟踪发现
log4net.ILog log = log4net.LogManager.GetLogger( " AppLogger " ); 创建的log是一个log4net.Core.LogImpl类型,而此类型中有个Logger属性刚刚好是log4net.Repository.Hierarchy.Logger
类型,所以想当然的有以下修改log路径的函数 1 private void ChangeLog4netLogFileName(log4net.ILog iLog, string fileName) 2 { 3 log4net.Core.LogImpl logImpl = iLog as log4net.Core.LogImpl; 4 if (logImpl != null ) 5 { 6 log4net.Appender.AppenderCollection ac = ((log4net.Repository.Hierarchy.Logger)logImpl.Logger).Appenders; 7 for ( int i = 0 ;i < ac.Count;i ++ ) 8 { // 这里我只对RollingFileAppender类型做修改 9 log4net.Appender.RollingFileAppender rfa = ac[i] as log4net.Appender.RollingFileAppender; 10 if (rfa != null ) 11 { 12 rfa.File = fileName; 13 if ( ! System.IO.File.Exists(fileName)) 14 { 15 System.IO.File.Create(fileName); 16 } 17 } 18 } 19 } 20 }
ok,让我们测试一下
private void TestChangeLog4netLogFileName() { string fileName = @" c:/chang.log " ; log4net.ILog iLog = log4net.LogManager.GetLogger( " AppLogger " ); ChangeLog4netLogFileName(iLog, fileName); iLog.Info( " Test:info " ); }
运行,哦C盘根目录下并没有要预期一样没有出现chang.log文件.why?猜想RollingFileAppender在初始化的时候就
固定了文件名,后期对文件名的修改是不起作用的.继续跟踪代码,发现RollingFileAppender在记录日志时直接使用初始化时就实例化的一个QuietTextWriter类型的私有变量m_qtw(直接继承于基类TextWriterAppender),继续跟踪发现基类(TextWriterAppender)提供了Writer属性来修改m_qtw的值,所有修改一下上面的ChangeLog4netLogFileName函数 1 private void ChangeLog4netLogFileName(log4net.ILog iLog, string fileName) 2 { 3 log4net.Core.LogImpl logImpl = iLog as log4net.Core.LogImpl; 4 if (logImpl != null ) 5 { 6 log4net.Appender.AppenderCollection ac = ((log4net.Repository.Hierarchy.Logger)logImpl.Logger).Appenders; 7 for ( int i = 0 ;i < ac.Count;i ++ ) 8 { // 这里我只对RollingFileAppender类型做修改 9 log4net.Appender.RollingFileAppender rfa = ac[i] as log4net.Appender.RollingFileAppender; 10 if (rfa != null ) 11 { 12 rfa.File = fileName; 13 if ( ! System.IO.File.Exists(fileName)) 14 { 15 System.IO.File.Create(fileName); 16 } 17 // 更新Writer属性 18 rfa.Writer = new System.IO.StreamWriter(rfa.File,rfa.AppendToFile,rfa.Encoding); 19 } 20 } 21 } 22 }
在运行上面的测试代码,ok,chang.log文件如愿的出现.
第一次写blogs,罗里罗嗦一大段,希望不会挑战你的耐心^_^最后附上log4net的配置(也直接从cnblogs上的某位大侠上面copy下来的) 1 <? xml version="1.0" encoding="utf-8" ?> 2 < configuration > 3 <!-- 如果不用App.config作配置文件，则configSections节不是必须的。 --> 4 < configSections > 5 <!-- “type”属性的完整格式为：配置节处理器类名,程序集名称,Version=程序集版本号,Culture=区域信息,PublicKeyToken=公钥 --> 6 < section name ="log4net" type ="log4net.Config.Log4NetConfigurationSectionHandler,log4net" /> 7 </ configSections > 8 < log4net > 9 <!-- 日志记录器logger，可以有多个 --> 10 < logger name ="AppLogger" > 11 < level value ="ALL" /> 12 < appender-ref ref ="RollingLogFileAppender" /> 13 < appender-ref ref ="ConsoleAppender" /> 14 </ logger > 15 < logger name ="Form1" > 16 < level value ="DEBUG" /> 17 < appender-ref ref ="LogFileAppender" /> 18 </ logger > 19 <!-- 所有logger的基，root的设置在所有logger中都起作用。 20 当在root和logger中重复设定相同的appender时，你会发现同一日志信息将被记录两次。 --> 21 <!-- <root> 22 <level value="WARN" /> 23 <appender-ref ref="LogFileAppender" /> 24 <appender-ref ref="ConsoleAppender" /> 25 </root> --> 26 <!-- 一个appender可以由多个logger共用，当然一个logger可以指定多个appender。 --> 27 < appender name ="LogFileAppender" type ="log4net.Appender.FileAppender" > 28 < param name ="File" value ="App.log" /> 29 < param name ="AppendToFile" value ="true" /> 30 < layout type ="log4net.Layout.PatternLayout" > 31 < param name ="ConversionPattern" value ="%d [%t] %-5p %c [%x] %X{auth} - %m%n" /> 32 </ layout > 33 < filter type ="log4net.Filter.LevelRangeFilter" > 34 < param name ="LevelMin" value ="ALL" /> 35 < param name ="LevelMax" value ="FATAL" /> 36 </ filter > 37 </ appender > 38 < appender name ="RollingLogFileAppender" type ="log4net.Appender.RollingFileAppender" > 39 < file value ="log/logfile1.log" /> 40 < appendToFile value ="true" /> 41 < rollingStyle value ="Date" /> 42 < datePattern value ="yyyyMMdd" /> 43 < encoding value ="utf-8" /> 44 < layout type ="log4net.Layout.PatternLayout" > 45 < conversionPattern value ="%d [%r] [%-5level]: - %message%newline" /> 46 </ layout > 47 </ appender > 48 < appender name ="ConsoleAppender" type ="log4net.Appender.ConsoleAppender" > 49 < layout type ="log4net.Layout.PatternLayout" > 50 < param name ="ConversionPattern" value ="%d [%t] %-5p %c [%x] %X{auth} - %m%n" /> 51 </ layout > 52 </ appender > 53 </ log4net > 54 </ configuration >
<? xml version="1.0" encoding="utf-8" ?> 2 < configuration > 3 <!-- 如果不用App.config作配置文件，则configSections节不是必须的。 --> 4 < configSections > 5 <!-- “type”属性的完整格式为：配置节处理器类名,程序集名称,Version=程序集版本号,Culture=区域信息,PublicKeyToken=公钥 --> 6 < section name ="log4net" type ="log4net.Config.Log4NetConfigurationSectionHandler,log4net" /> 7 </ configSections > 8 < log4net > 9 <!-- 日志记录器logger，可以有多个 --> 10 < logger name ="AppLogger" > 11 < level value ="ALL" /> 12 < appender-ref ref ="RollingLogFileAppender" /> 13 < appender-ref ref ="ConsoleAppender" /> 14 </ logger > 15 < logger name ="Form1" > 16 < level value ="DEBUG" /> 17 < appender-ref ref ="LogFileAppender" /> 18 </ logger > 19 <!-- 所有logger的基，root的设置在所有logger中都起作用。 20 当在root和logger中重复设定相同的appender时，你会发现同一日志信息将被记录两次。 --> 21 <!-- <root> 22 <level value="WARN" /> 23 <appender-ref ref="LogFileAppender" /> 24 <appender-ref ref="ConsoleAppender" /> 25 </root> --> 26 <!-- 一个appender可以由多个logger共用，当然一个logger可以指定多个appender。 --> 27 < appender name ="LogFileAppender" type ="log4net.Appender.FileAppender" > 28 < param name ="File" value ="App.log" /> 29 < param name ="AppendToFile" value ="true" /> 30 < layout type ="log4net.Layout.PatternLayout" > 31 < param name ="ConversionPattern" value ="%d [%t] %-5p %c [%x] %X{auth} - %m%n" /> 32 </ layout > 33 < filter type ="log4net.Filter.LevelRangeFilter" > 34 < param name ="LevelMin" value ="ALL" /> 35 < param name ="LevelMax" value ="FATAL" /> 36 </ filter > 37 </ appender > 38 < appender name ="RollingLogFileAppender" type ="log4net.Appender.RollingFileAppender" > 39 < file value ="log/logfile1.log" /> 40 < appendToFile value ="true" /> 41 < rollingStyle value ="Date" /> 42 < datePattern value ="yyyyMMdd" /> 43 < encoding value ="utf-8" /> 44 < layout type ="log4net.Layout.PatternLayout" > 45 < conversionPattern value ="%d [%r] [%-5level]: - %message%newline" /> 46 </ layout > 47 </ appender > 48 < appender name ="ConsoleAppender" type ="log4net.Appender.ConsoleAppender" > 49 < layout type ="log4net.Layout.PatternLayout" > 50 < param name ="ConversionPattern" value ="%d [%t] %-5p %c [%x] %X{auth} - %m%n" /> 51 </ layout > 52 </ appender > 53 </ log4net > 54 </ configuration >