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[ASP.net教程]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.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());  //...}