LoggingUtility

 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Reflection;
using log4net;
using log4net.Core;
using log4net.Appender;
using log4net.Repository.Hierarchy;
using log4net.Repository;

namespace Logging
{
    public static class LoggingUtility
    {
        private static BufferingAppenderSkeleton[] bufferingAppendersCache = LoadAllBufferingAppenders();

        public static void Flush(this ILog log)
        {
            foreach (BufferingAppenderSkeleton appender in bufferingAppendersCache)
            {
                appender.Flush();
            }
        }

        private static BufferingAppenderSkeleton[] LoadAllBufferingAppenders()
        {
            List<BufferingAppenderSkeleton> bufferingAppenderList = new List<BufferingAppenderSkeleton>();
            foreach (IAppender appender in LogManager.GetRepository().GetAppenders())
            {
                BufferingAppenderSkeleton bufferingAppender = appender as BufferingAppenderSkeleton;

                if (bufferingAppender != null)
                {
                    bufferingAppenderList.Add(bufferingAppender);
                }
            }

            return bufferingAppenderList.ToArray();
        }

        public static Level GetLoggingLevel()
        {
            Hierarchy h = (Hierarchy)LogManager.GetRepository();
            return h.Root.Level;
        }

        public static void SetLoggingLevel(Level level)
        {
            string strLogLevel = level.ToString();

            ILoggerRepository[] repositories = LogManager.GetAllRepositories();
            //Configure all loggers to be at the debug level.      
            foreach (log4net.Repository.ILoggerRepository repository in repositories)
            {
                repository.Threshold = repository.LevelMap[strLogLevel];
                Hierarchy hier = (Hierarchy)repository;
                ILogger[] loggers = hier.GetCurrentLoggers();
                foreach (ILogger logger in loggers)
                {
                    ((Logger)logger).Level = hier.LevelMap[strLogLevel];
                }
            }
            //Configure the root logger.      
            Hierarchy h = (Hierarchy)log4net.LogManager.GetRepository();
            Logger rootLogger = h.Root;
            rootLogger.Level = h.LevelMap[strLogLevel];
        }

        /// <summary>
        /// Logs the runtime environment on application starts.
        /// </summary>
        /// <param name="logger"></param>
        /// <param name="currentMethod"></param>
        public static void LogAppStart(this ILog logger, MethodBase currentMethod)
        {
            #region -----------------------------INFO Environment --------------------------------------
            if (logger.IsInfoEnabled)
            {
                logger.InfoFormat("###### {0} - Application Starts at : {1}",
                    currentMethod,
                    DateTime.Now);

                logger.InfoFormat("###### {0} - Current Logging Level : {1}",
                    currentMethod,
                    LoggingUtility.GetLoggingLevel());

                logger.InfoFormat("###### {0} - Environment : \r\n{1}",
                    currentMethod,
                    GetEnvironmentInfo());
            }
            #endregion --------------------------INFO Environment --------------------------------------

            LogAssemblies(logger, currentMethod);
        }

        /// <summary>
        /// Logs the timestamp on application ends.
        /// </summary>
        /// <param name="logger"></param>
        /// <param name="currentMethod"></param>
        public static void LogAppEnd(this ILog logger, MethodBase currentMethod)
        {
            #region -----------------------------INFO Exit --------------------------------------
            if (logger.IsInfoEnabled)
            {
                logger.InfoFormat("###### {0} - Application Exits at : {1}",
                    currentMethod,
                    DateTime.Now);
                logger.InfoFormat("\r\n\r\n");
            }
            #endregion --------------------------INFO Exit --------------------------------------
        }

        /// <summary>
        /// Returns a string which holds the system information, such as OS version, CLR version
        /// </summary>
        /// <returns></returns>
        private static string GetEnvironmentInfo()
        {
            StringBuilder sbuf = new StringBuilder();
            sbuf.AppendLine("OS : " + Environment.OSVersion);
            sbuf.AppendLine("CLR Version : " + Environment.Version.ToString());
            sbuf.AppendLine("MachineName : " + Environment.MachineName);
            sbuf.AppendLine("SystemDirectory : " + Environment.SystemDirectory);
            sbuf.AppendLine("UserDomainName : " + Environment.UserDomainName);
            sbuf.AppendLine("UserName : " + Environment.UserName);
            sbuf.Append("CurrentDirectory : " + Environment.CurrentDirectory);
            return sbuf.ToString();
        }

        /// <summary>
        /// Logs all the assemblies already loaded, and also creates a log entry when a new assembly is loaded.
        /// </summary>
        /// <param name="logger"></param>
        /// <param name="currentMethod"></param>
        private static void LogAssemblies(ILog logger, MethodBase currentMethod)
        {
            // for future assemblies
            AppDomain.CurrentDomain.AssemblyLoad += delegate(object sender, AssemblyLoadEventArgs args)
            {
                if (logger.IsInfoEnabled)
                {
                    logger.InfoFormat("###### {0} - ************** Assemly Loaded : {1}",
                        MethodBase.GetCurrentMethod(),
                        args.LoadedAssembly.FullName);
                    logger.InfoFormat("###### {0} - ************** Assemly CodeBase : {1}",
                        MethodBase.GetCurrentMethod(),
                        args.LoadedAssembly.CodeBase);
                }
            };

            // assemblies already loaded
            Assembly[] assemblies = AppDomain.CurrentDomain.GetAssemblies();
            foreach (Assembly asm in assemblies)
            {
                if (logger.IsInfoEnabled)
                {
                    logger.InfoFormat("###### {0} - ************** Assemly PreLoaded : {1}",
                        currentMethod,
                        asm.FullName);
                    logger.InfoFormat("###### {0} - ************** Assemly CodeBase : {1}",
                        currentMethod,
                        asm.CodeBase);
                }
            }
        }
    }
}

<configuration>
  <configSections>    
    <!-- ================================================================================= -->
    <!--                              LOG4NET                                              -->
    <!-- ================================================================================= -->
    <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/>
  </configSections>
  <!-- ================================================================================= -->
  <!--                              LOG4NET                                              -->
  <!-- ================================================================================= -->
  <log4net>
    <root>
      <level value="INFO" />
      <appender-ref ref="ConsoleAppender" />
      <appender-ref ref="FileAppender" />
    </root>

    <appender name="ConsoleAppender" type="log4net.Appender.ConsoleAppender" >
      <layout type="log4net.Layout.PatternLayout">
        <param name="ConversionPattern" value="[SimpleAppConfig] %date [%thread] %-5level %logger - %message%newline" />
      </layout>
    </appender>

    <appender name="FileAppender" type="log4net.Appender.FileAppender">
      <!-- ================================================================================= -->
      <!--               LogFile location : under App_Data                                   -->
      <!-- ================================================================================= -->
      <file value="log-file.txt" />
      <appendToFile value="true" />
      <lockingModel type="log4net.Appender.FileAppender+MinimalLock" />
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" />
      </layout>
    </appender>

  </log4net>
</configuration>

// LOG4NET
[assembly: log4net.Config.XmlConfigurator()]