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ASP.NET 系列:单元测试之Log4Net

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。

1.定义ILogger接口

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); } 

2.创建使用Log4Net适配的实现类Log4NetAdapter

 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));         }     } } 

3.使用MemoryAppender进行单元测试

 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"));     } } 

4.创建Log4NetLoggerFactory

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> 

4.通过依赖注入使用ILogger

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());     //... } 
原文  http://www.cnblogs.com/easygame/p/5179216.html
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