C# Log4 写日志

2，解压出Log4net组件dll：

incubating-log4net-1.2.10.zip\log4net-1.2.10\bin\net\2.0\release：
log4net.xml
log4net.dll

3，将log4net.dll拷贝到.Net项目目录下的：bin/debug下；

4，将log4net.dll加到项目引用中

5，在bin/debug下建立log4net配置文件log4net.xml，文件内容如下：

<? xml version ="1.0" encoding ="utf-8" ?>
< configuration >

     < configSections >
         < section name ="log4net" type ="log4net.Config.Log4NetConfigurationSectionHandler, log4net-net-1.0"     />
     </ configSections >

     < log4net >
         < root >
             < level value ="WARN" />
             < appender-ref ref ="LogFileAppender" />
             < appender-ref ref ="ConsoleAppender" />
         </ root >

         < logger name ="com.suntom" >
             < level value ="DEBUG" />
         </ logger >

         < appender name ="LogFileAppender" type ="log4net.Appender.FileAppender" >
             < param name ="File" value ="./log.txt" />
             < param name ="AppendToFile" value ="true" />
             < layout type ="log4net.Layout.PatternLayout" >
                 < param name ="Header" value ="[Header]\r\n" />
                 < param name ="Footer" value ="[Footer]\r\n" />
                 < param name ="ConversionPattern" value ="%d [%t] %-5p %c - %m%n" />
             </ layout >
             < filter type ="log4net.Filter.LevelRangeFilter" >
                 < param name ="LevelMin" value ="DEBUG" />
                 < param name ="LevelMax" value ="FATAL" />
             </ filter >
         </ appender >

         < appender name ="ConsoleAppender" type ="log4net.Appender.ConsoleAppender" >
             < layout type ="log4net.Layout.PatternLayout" >
                 < param name ="ConversionPattern" value ="%d [%t] %-5p %c [%x] - %m%n" />
             </ layout >
         </ appender >

     </ log4net >

</ configuration >

6，在项目中配置Log4net，配置方法：在AssemblyInfo.cs(Web 项目为web.config)最下面添加：

[assembly: log4net.Config.XmlConfigurator(ConfigFile="./log4net.xml", ConfigFileExtension="xml", Watch=true)]

7，在项目中使用Log4net，如类：com.suntom.testClass:
log4net.ILog log = log4net.LogManager.GetLogger(this.GetType());

log.Debug("Enter initMenus()");

8, 启动程序并运行到日志输出处，退出程序后就可以在 bin/debug下看到日志文件：

log.txt：

[Header]\r\n2011-07-04 22:38:58,226 [10] DEBUG com.suntom.testClass - Enter initMenus()
[Footer]

注：若用VS2010的话，编译出错报缺少using引用之类的话，在解决方案中右击--属性--目标框架中选择.NET FrameWork4.0 如下图：

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