引言
log4net库是Apache log4j框架在Micorsoft.NET平台的实现，是一个帮组程序员将日志信息输出到各种目标（控制台、文件、数据库等）的工具。（百度百科）
实际项目中使用log4net极大的方便程序猿记录系统运行过程中的日志信息，特别是对bs系统说是一个比较实用的工具。本文简单解释它的使用过程，都是最基本的最简单的运用，没有其他多余的解释只是简单使用。
使用步骤：
步骤一：
在项目文件中创建一个类库，本例使用类库名：Log4NetUtility。引用log4net库的dll，添加配置文件log4net.cfg.xml,注意将该文件的属性设置为始终复制。配置文件都是一些固定的格式，可以做一些简单的改动。基本内容如下：
<?xml version="1.0" encoding="utf-8" ?><configuration> <configSections> <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/> </configSections> <!--日志记录组建配置--> <log4net debug="true"> <!-- 调试日志配置 --> <appender name="DebugAppender" type="log4net.Appender.DebugAppender"> <layout type="log4net.Layout.PatternLayout"> <conversionPattern value="[%date][%thread][%-5level][%c] - %message%newline" /> </layout> </appender> <!-- 文件日志配置 --> <appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender"> <appendToFile value="true" /> <rollingStyle value="Date" /> <staticLogFileName value="false"/> <maxSizeRollBackups value="-1" /> <datePattern value="yyyy-MM-dd_HH'.log'" /> <lockingModel value="log4net.Appender.FileAppender.MinimalLock" /> <file value="Log//" /> <layout type="log4net.Layout.PatternLayout"> <conversionPattern value="[%date][%thread][%-5level]%message%newline" /> </layout> </appender> <!-- Setup the root category, add the appenders and set the default PRiority --> <root> <level value="ALL" /> <appender-ref ref="DebugAppender" /> </root> <logger name="FileLogLogger" additivity="false"> <level value="ALL" /> <appender-ref ref="RollingLogFileAppender" /> </logger> </log4net></configuration>
步骤二：
编写日志方法，如下：
public class Log4NetUtility { private static ILog fileLogger = LogManager.GetLogger("FileLogLogger"); private static ILog debugLogger = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType); static Log4NetUtility() { string binPath = System.AppDomain.CurrentDomain.BaseDirectory; string webFfileName = binPath + @"bin/Config/log4net.cfg.xml"; string appFileName = binPath + @"Config/log4net.cfg.xml"; if (File.Exists(webFfileName)) log4net.Config.XmlConfigurator.ConfigureAndWatch(new FileInfo(webFfileName)); else if (File.Exists(appFileName)) log4net.Config.XmlConfigurator.ConfigureAndWatch(new FileInfo(appFileName)); else Console.WriteLine("找不到Log4net配置文件"); } public static void DebugLog(String message) { debugLogger.Debug(message); } public static void Debug(object o, string message, Exception exception) { Type type = o.GetType(); fileLogger.Debug(string.Format("[{0}.{1}] - {2}", type.Namespace, type.Name, message), exception); } public static void Debug(object o, String message) { Type type = o.GetType(); fileLogger.Debug(string.Format("[{0}.{1}] - {2}", type.Namespace, type.Name, message)); } public static void Debug(String typeName, String message, Exception exception) { fileLogger.Debug(string.Format("[{0}] - {1}", typeName, message), exception); } public static void Debug(String typeName, String message) { fileLogger.Debug(string.Format("[{0}] - {1}", typeName, message)); } public static void Info(object o, String message, Exception exception) { Type type = o.GetType(); fileLogger.Info(string.Format("[{0}.{1}] - {2}", type.Namespace, type.Name, message), exception); } public static void Info(object o, String message) { Type type = o.GetType(); fileLogger.Info(string.Format("[{0}.{1}] - {2}", type.Namespace, type.Name, message)); } public static void Info(string typeName, String message, Exception exception) { fileLogger.Info(string.Format("[{0}] - {1}", typeName, message), exception); } public static void Info(string typeName, String message) { fileLogger.Info(string.Format("[{0}] - {1}", typeName, message)); } public static void Warn(object o, String message, Exception exception) { Type type = o.GetType(); fileLogger.Warn(string.Format("[{0}.{1}] - {2}", type.Namespace, type.Name, message), exception); } public static void Warn(object o, String message) { Type type = o.GetType(); fileLogger.Warn(string.Format("[{0}.{1}] - {2}", type.Namespace, type.Name, message)); } public static void Warn(string typeName, String message, Exception exception) { fileLogger.Warn(string.Format("[{0}] - {1}", typeName, message), exception); } public static void Warn(string typeName, String message) { fileLogger.Warn(string.Format("[{0}] - {1}", typeName, message)); } public static void Error(object o, String message, Exception exception) { Type type = o.GetType(); fileLogger.Error(string.Format("[{0}.{1}] - {2}", type.Namespace, type.Name, message), exception); } public static void Error(object o, String message) { Type type = o.GetType(); fileLogger.Error(string.Format("[{0}.{1}] - {2}", type.Namespace, type.Name, message)); } public static void Error(string typeName, String message, Exception exception) { fileLogger.Error(string.Format("[{0}] - {1}", typeName, message), exception); } public static void Error(string typeName, String message) { fileLogger.Error(string.Format("[{0}] - {1}", typeName, message)); } public static void Fatal(object o, String message, Exception exception) { Type type = o.GetType(); fileLogger.Fatal(string.Format("[{0}.{1}] - {2}", type.Namespace, type.Name, message), exception); } public static void Fatal(object o, String message) { Type type = o.GetType(); fileLogger.Fatal(string.Format("[{0}.{1}] - {2}", type.Namespace, type.Name, message)); } public static void Fatal(string typeName, String message, Exception exception) { fileLogger.Fatal(string.Format("[{0}] - {1}", typeName, message), exception); } public static void Fatal(string typeName, String message) { fileLogger.Fatal(string.Format("[{0}] - {1}", typeName, message)); } }
步骤三：
系统内进行调用：
Log4NetUtility.Log4NetUtility .Error(this, "log4net日志错误记录");
至此，log4net的简单应用就介绍完了，本文还是那句话，就是介绍它的一些简单用法，告诉你如何使用它，具体其内部的原理还有更深层的东西还是交给以后吧。
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