ASP.NET 系列:单元测试之Log4Net

zlbgfbrdr 4年前

来自: http://www.cnblogs.com/easygame/p/5179216.html

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());      //...  }