asp.net core + log4net+exceptionles+DI

参考了ABP的代码，我也用依赖注入的原则，设计了日志模块。

与abp不同之处在于：1)DI容器使用的是.net core自带的注入容器，2）集成了excetpionless日志模块，3）不依赖于abp

主要的思想就是，1）定义日志操作接口 2）使用log4net实现日志接口，3）实现注入  4）使用日志

1）定义日志接口，这里直接使用了castle的日志接口

2）使用log4net实现日志接口

    [Serializable]
    public class Log4NetLogger :
            MarshalByRefObject,
            ILogger
    {
        private static readonly Type DeclaringType = typeof(Log4NetLogger);
        
        private log4net.Core.ILogger _logger;
        private Log4NetLoggerFactory _factory;
        public Log4NetLogger()
        {
            _factory = new Log4NetLoggerFactory();
            _logger = _factory.GetLogger("cislog");
        }

        public bool IsDebugEnabled
        {
            get { return _logger.IsEnabledFor(Level.Debug); }
        }

        public bool IsErrorEnabled
        {
            get { return _logger.IsEnabledFor(Level.Error); }
        }

        public bool IsFatalEnabled
        {
            get { return _logger.IsEnabledFor(Level.Fatal); }
        }

        public bool IsInfoEnabled
        {
            get { return _logger.IsEnabledFor(Level.Info); }
        }

        public bool IsWarnEnabled
        {
            get { return _logger.IsEnabledFor(Level.Warn); }
        }



        public override string ToString()
        {
            return _logger.ToString();
        }
        
        public void Debug(string message)
        {
            if (IsDebugEnabled)
            {
                _logger.Log(DeclaringType, Level.Debug, message, null);
            }
        }

        public void Debug(Func<string> messageFactory)
        {
            if (IsDebugEnabled)
            {
                _logger.Log(DeclaringType, Level.Debug, messageFactory.Invoke(), null);
            }
        }

        public void Debug(string message, Exception exception)
        {
            if (IsDebugEnabled)
            {
                _logger.Log(DeclaringType, Level.Debug, message, exception);
            }
        }

        public void DebugFormat(string format, params Object[] args)
        {
            if (IsDebugEnabled)
            {
                _logger.Log(DeclaringType, Level.Debug, new SystemStringFormat(CultureInfo.InvariantCulture, format, args), null);
            }
        }

        public void DebugFormat(Exception exception, string format, params Object[] args)
        {
            if (IsDebugEnabled)
            {
                _logger.Log(DeclaringType, Level.Debug, new SystemStringFormat(CultureInfo.InvariantCulture, format, args), exception);
            }
        }

        public void DebugFormat(IFormatProvider formatProvider, string format, params Object[] args)
        {
            if (IsDebugEnabled)
            {
                _logger.Log(DeclaringType, Level.Debug, new SystemStringFormat(formatProvider, format, args), null);
            }
        }

        public void DebugFormat(Exception exception, IFormatProvider formatProvider, string format, params Object[] args)
        {
            if (IsDebugEnabled)
            {
                _logger.Log(DeclaringType, Level.Debug, new SystemStringFormat(formatProvider, format, args), exception);
            }
        }

        public void Error(string message)
        {
            if (IsErrorEnabled)
            {
                _logger.Log(DeclaringType, Level.Error, message, null);
            }
        }

        public void Error(Func<string> messageFactory)
        {
            if (IsErrorEnabled)
            {
                _logger.Log(DeclaringType, Level.Error, messageFactory.Invoke(), null);
            }
        }

        public void Error(string message, Exception exception)
        {
            if (IsErrorEnabled)
            {
                _logger.Log(DeclaringType, Level.Error, message, exception);
            }
        }

        public void ErrorFormat(string format, params Object[] args)
        {
            if (IsErrorEnabled)
            {
                _logger.Log(DeclaringType, Level.Error, new SystemStringFormat(CultureInfo.InvariantCulture, format, args), null);
            }
        }

        public void ErrorFormat(Exception exception, string format, params Object[] args)
        {
            if (IsErrorEnabled)
            {
                _logger.Log(DeclaringType, Level.Error, new SystemStringFormat(CultureInfo.InvariantCulture, format, args), exception);
            }
        }

        public void ErrorFormat(IFormatProvider formatProvider, string format, params Object[] args)
        {
            if (IsErrorEnabled)
            {
                _logger.Log(DeclaringType, Level.Error, new SystemStringFormat(formatProvider, format, args), null);
            }
        }

        public void ErrorFormat(Exception exception, IFormatProvider formatProvider, string format, params Object[] args)
        {
            if (IsErrorEnabled)
            {
                _logger.Log(DeclaringType, Level.Error, new SystemStringFormat(formatProvider, format, args), exception);
            }
        }

        public void Fatal(string message)
        {
            if (IsFatalEnabled)
            {
                _logger.Log(DeclaringType, Level.Fatal, message, null);
            }
        }

        public void Fatal(Func<string> messageFactory)
        {
            if (IsFatalEnabled)
            {
                _logger.Log(DeclaringType, Level.Fatal, messageFactory.Invoke(), null);
            }
        }

        public void Fatal(string message, Exception exception)
        {
            if (IsFatalEnabled)
            {
                _logger.Log(DeclaringType, Level.Fatal, message, exception);
            }
        }

        public void FatalFormat(string format, params Object[] args)
        {
            if (IsFatalEnabled)
            {
                _logger.Log(DeclaringType, Level.Fatal, new SystemStringFormat(CultureInfo.InvariantCulture, format, args), null);
            }
        }

        public void FatalFormat(Exception exception, string format, params Object[] args)
        {
            if (IsFatalEnabled)
            {
                _logger.Log(DeclaringType, Level.Fatal, new SystemStringFormat(CultureInfo.InvariantCulture, format, args), exception);
            }
        }

        public void FatalFormat(IFormatProvider formatProvider, string format, params Object[] args)
        {
            if (IsFatalEnabled)
            {
                _logger.Log(DeclaringType, Level.Fatal, new SystemStringFormat(formatProvider, format, args), null);
            }
        }

        public void FatalFormat(Exception exception, IFormatProvider formatProvider, string format, params Object[] args)
        {
            if (IsFatalEnabled)
            {
                _logger.Log(DeclaringType, Level.Fatal, new SystemStringFormat(formatProvider, format, args), exception);
            }
        }

        public void Info(string message)
        {
            if (IsInfoEnabled)
            {
                _logger.Log(DeclaringType, Level.Info, message, null);
            }
        }

        public void Info(Func<string> messageFactory)
        {
            if (IsInfoEnabled)
            {
                _logger.Log(DeclaringType, Level.Info, messageFactory.Invoke(), null);
            }
        }

        public void Info(string message, Exception exception)
        {
            if (IsInfoEnabled)
            {
                _logger.Log(DeclaringType, Level.Info, message, exception);
            }
        }

        public void InfoFormat(string format, params Object[] args)
        {
            if (IsInfoEnabled)
            {
                _logger.Log(DeclaringType, Level.Info, new SystemStringFormat(CultureInfo.InvariantCulture, format, args), null);
            }
        }

        public void InfoFormat(Exception exception, string format, params Object[] args)
        {
            if (IsInfoEnabled)
            {
                _logger.Log(DeclaringType, Level.Info, new SystemStringFormat(CultureInfo.InvariantCulture, format, args), exception);
            }
        }

        public void InfoFormat(IFormatProvider formatProvider, string format, params Object[] args)
        {
            if (IsInfoEnabled)
            {
                _logger.Log(DeclaringType, Level.Info, new SystemStringFormat(formatProvider, format, args), null);
            }
        }

        public void InfoFormat(Exception exception, IFormatProvider formatProvider, string format, params Object[] args)
        {
            if (IsInfoEnabled)
            {
                _logger.Log(DeclaringType, Level.Info, new SystemStringFormat(formatProvider, format, args), exception);
            }
        }

        public void Warn(string message)
        {
            if (IsWarnEnabled)
            {
                _logger.Log(DeclaringType, Level.Warn, message, null);
            }
        }

        public void Warn(Func<string> messageFactory)
        {
            if (IsWarnEnabled)
            {
                _logger.Log(DeclaringType, Level.Warn, messageFactory.Invoke(), null);
            }
        }

        public void Warn(string message, Exception exception)
        {
            if (IsWarnEnabled)
            {
                _logger.Log(DeclaringType, Level.Warn, message, exception);
            }
        }

        public void WarnFormat(string format, params Object[] args)
        {
            if (IsWarnEnabled)
            {
                _logger.Log(DeclaringType, Level.Warn, new SystemStringFormat(CultureInfo.InvariantCulture, format, args), null);
            }
        }

        public void WarnFormat(Exception exception, string format, params Object[] args)
        {
            if (IsWarnEnabled)
            {
                _logger.Log(DeclaringType, Level.Warn, new SystemStringFormat(CultureInfo.InvariantCulture, format, args), exception);
            }
        }

        public void WarnFormat(IFormatProvider formatProvider, string format, params Object[] args)
        {
            if (IsWarnEnabled)
            {
                _logger.Log(DeclaringType, Level.Warn, new SystemStringFormat(formatProvider, format, args), null);
            }
        }

        public void WarnFormat(Exception exception, IFormatProvider formatProvider, string format, params Object[] args)
        {
            if (IsWarnEnabled)
            {
                _logger.Log(DeclaringType, Level.Warn, new SystemStringFormat(formatProvider, format, args), exception);
            }
        }

        public ILogger CreateChildLogger(string loggerName)
        {
            throw new NotImplementedException();
        }
    }

    public class Log4NetLoggerFactory : AbstractLoggerFactory
    {
        internal const string DefaultConfigFileName = "log4net.config";
        private readonly ILoggerRepository _loggerRepository;

        public Log4NetLoggerFactory()
            : this(DefaultConfigFileName)
        {
        }

        public Log4NetLoggerFactory(string configFileName)
        {
            _loggerRepository = LogManager.CreateRepository(
                typeof(Log4NetLoggerFactory).GetAssembly(),
                typeof(log4net.Repository.Hierarchy.Hierarchy)
            );
            
            XmlConfigurator.Configure(_loggerRepository, new FileInfo("log4net.config"));
        }

        public log4net.Core.ILogger GetLogger(string name)
        {
            return LogManager.GetLogger(_loggerRepository.Name, name).Logger;
        }

        public override ILogger Create(string name)
        {
            if (name == null)
            {
                throw new ArgumentNullException(nameof(name));
            }

            return new Log4NetLogger();
        }

        public override ILogger Create(string name, LoggerLevel level)
        {
            throw new NotSupportedException("Logger levels cannot be set at runtime. Please review your configuration file.");
        }
    }

    public static class TypeExtensions
    {
        public static Assembly GetAssembly(this Type type)
        {
            return type.GetTypeInfo().Assembly;
        }
    }

下面是扩展方法，这里实现注入：

    public static class Log4NetLoggerExtensions
    {
        public static IServiceCollection UseExceptionless(this IServiceCollection services)
        {
            services.AddTransient<ILogger, Log4NetLogger>();

            return services;
        }
    }

然后就可以在startup中使用了

        public void ConfigureServices(IServiceCollection services)
        {
            services.AddMvc();
            services.UseExceptionless();
        }

比如我们在HomeController中使用：

    public class HomeController : Controller
    {
        private ILogger _logger;

        public HomeController(ILogger logger)
        {
            _logger = logger;
        }
        public IActionResult Index()
        {
           // throw new Exception("快点来!!!!!!!!!!!!!!!!!!");
            _logger.Info("index view");
            _logger.Debug("出错了！，快点来，！！");
            _logger.Error("Controller Error");
            return View();
        }
}

最后是配置文件：

最重要的是注意exceptionless的配置

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <!-- This section contains the log4net configuration settings -->
  <log4net>
    <appender name="ConsoleAppender" type="log4net.Appender.ConsoleAppender">
      <layout type="log4net.Layout.PatternLayout" value="%date [%thread] %-5level %logger - %message%newline" />
    </appender>
    <appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">
      <file value="Logs/" />
      <appendToFile value="true" />
      <rollingStyle value="Composite" />
      <staticLogFileName value="false" />
      <datePattern value="yyyy-MM-dd'.log'" />
      <maxSizeRollBackups value="10" />
      <maximumFileSize value="1MB" />
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" />
      </layout>
    </appender>
    <appender name="Exceptionless" type="Exceptionless.Log4net.ExceptionlessAppender,Exceptionless.Log4net">
      <apiKey value="d5qna1t9qTUVwrRzLFz1T3z8wSUeO3xNtxOGMHLf" />
      <serverUrl value="http://10.117.130.150:9001" />
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%-4timestamp [%thread] %-5level %logger %ndc - %message%newline"/>
      </layout>
    </appender>
    <!-- Setup the root category, add the appenders and set the default level -->
    <root>
      <level value="ALL" />
      <appender-ref ref="ConsoleAppender" />
      <appender-ref ref="RollingLogFileAppender" />
      <appender-ref ref="Exceptionless"/>
    </root>
  </log4net>
</configuration>

还有一点非常重要，记得引用，否则在exceptionless中也看不到日志

效果如图：

 最后，提一点：

现在容器技术很火，如果把这套代码放在容器中运行肯定是不行，因为在配置文件中配置了apikey和url, 所以要稍做修改如下：

添加一个类：

    public class ExceptionlessOption
    {
        /// <summary>
        /// 日志应用标识，从Exceptionless面板获取
        /// </summary>
        public string ApiKey { get; set; }

        /// <summary>
        /// 日志应用接口地址
        /// </summary>
        public string Url { get; set; }
    }

            services.AddMvc();
            
            services.UseExceptionless(() =>
            {
                return new ExceptionlessOption {
                    ApiKey = "234na1t9qTU234234234z8wSUeO3x234234HLf",
                    Url = "http://100.11.13.10:9001" };
            });

        public Log4NetLoggerFactory(ExceptionlessOption _option, string configFileName)
        {
            _loggerRepository = LogManager.CreateRepository(
                typeof(Log4NetLoggerFactory).GetAssembly(),
                typeof(log4net.Repository.Hierarchy.Hierarchy)
            );
            //读取配置
            XmlConfigurator.Configure(_loggerRepository, new FileInfo("log4net.config"));

            //TODO这里修改
            ExceptionlessClient.Default.Configuration.ApiKey = _option.ApiKey ?? "d5qna1t9qTUVwrRzLFz1T3z8wSUeO3xNtxOGMHLf";
            ExceptionlessClient.Default.Configuration.ServerUrl = _option.Url ??  "http://10.117.130.150:9001";

        }

然后你就可以在startup中通过读取配置文件，实现参数的传入了。