使用Log组件时，我们通常自定义ILogger接口，使用Log4Net等组件进行适配来定义不同的实现类。使用Log4Net日志组件时，为了即方便单元测试又能使用配置文件，我们通过Log4Net的ILogger接口使用Log4Net，对Log4Net进行单元测试时我们可以通过使用MemoryAppender方式测试。
ILogger可以通过使用日志级别的枚举类型精简方法数量，也可以不适用枚举直接定义多个方法。
public interface ILogger{ void Debug(string format, params string[] args); void Error(string format, params string[] args); void Fatal(string format, params string[] args); void Info(string format, params string[] args); void Warn(string format, params string[] args);}
public class Log4NetAdapter : ILogger{ PRivate readonly ILog _rootLogger; public Log4NetAdapter(ILog rootLogger) { this._rootLogger = rootLogger; } public void Debug(string format, params string[] args) { if (this._rootLogger.IsDebugEnabled) { _rootLogger.Debug(string.Format(format, args)); } } public void Info(string format, params string[] args) { if (this._rootLogger.IsInfoEnabled) { _rootLogger.Info(string.Format(format, args)); } } public void Warn(string format, params string[] args) { if (this._rootLogger.IsWarnEnabled) { _rootLogger.Warn(string.Format(format, args)); } } public void Error(string format, params string[] args) { if (this._rootLogger.IsErrorEnabled) { _rootLogger.Error(string.Format(format, args)); } } public void Fatal(string format, params string[] args) { if (this._rootLogger.IsFatalEnabled) { _rootLogger.Fatal(string.Format(format, args)); } }}
public class Log4netAdapterTest{ private MemoryAppender _appender; [Fact] public void Test() { _appender = new MemoryAppender { Name = "Unit Testing Appender", Layout = new log4net.Layout.PatternLayout("%message") }; _appender.ActivateOptions(); var root = ((Hierarchy)log4net.LogManager.GetRepository()).Root; root.AddAppender(_appender); root.Repository.Configured = true; ILogger logger = new Log4NetAdapter(log4net.LogManager.GetLogger("root")); logger.Info("test {0}", "message"); Assert.Equal(_appender.GetEvents()[0].MessageObject.ToString(), string.Format("test {0}", "message")); }}
通常我们使用配置文件方式配置Log4Net，因此创建Log4NetLoggerFactory提供从配置文件中创建的ILog对象。
public class LoggerFactory{ private static readonly log4net.ILog log = log4net.LogManager.GetLogger(typeof(LoggerFactory)); static LoggerFactory() { log4net.Config.xmlConfigurator.Configure(); } public static ILogger GetLogger() { return new Log4NetAdapter(log); }}
参考的配置文件
<configSections> <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,log4net" /></configSections><log4net> <root> <level value="ALL" /> <appender-ref ref="RollingLogFileAppender" /> </root> <appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender"> <param name="File" value="App_Data/Logs/log.txt" /> <param name="AppendToFile" value="true" /> <param name="RollingStyle" value="Date" /> <lockingModel type="log4net.Appender.FileAppender+MinimalLock" /> <preserveLogFileNameExtension value="true" /> <datePattern value="yyyyMMdd" /> <param name="StaticLogFileName" value="false" /> <layout type="log4net.Layout.PatternLayout"> <conversionPattern value="%date [%thread] %-5level %logger [%ndc] - %message%newline" /> </layout> </appender></log4net>
运行结果：
在asp.net项目中使用时，通过DI容器进行注入。
protected void application_Start(){ //... ObjectFactory.AddSingleton<ILogger, Log4NetAdapter>(LoggerFactory.GetLogger()); //...}
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