Log4Net Logging

Log4Net is a third party assembly, using which the logging functionality in an application could be error logging or info logging, etc… can be handled.

Logging the message in a log file or Event logs or Database table or Can be displayed in a console.

Below sample explains the same

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using log4net;

using log4net.Config;

using log4net.Appender;

using log4net.Layout;

using log4net.Repository;

using log4net.Core;

namespace ConsoleApplication4

{

    class Program

    {

        static void Main(string[] args)

        {

            try

            {

                //creating a log4net repository

                log4net.Repository.ILoggerRepository objRepository = log4net.LogManager.CreateRepository("MyRep");

                //applying setting to append logs in a file.

                //file name will be found in the application folder path with name same as repository name

                ConfigureFileAppender(objRepository);

                //applying setting to add logs to event viewer

                ConfigureEventLogAppender(objRepository);

                //applying setting to display the message in the console

                ConfigureConsoleAppender(objRepository);

                log4net.ILog objLog = log4net.LogManager.GetLogger("MyRep", typeof(MyInterface));

                //writing the debug message

                objLog.Debug("Test Message");

            }

            catch (Exception exp)

            {

                Console.WriteLine("Error : " + exp.Message);

            }

            Console.Read();

        }

        private static void ConfigureConsoleAppender(ILoggerRepository repository)

        {

            MyConsoleAppender objMyConsoleAppender = new MyConsoleAppender();

            objMyConsoleAppender.ActivateOptions();

            BasicConfigurator.Configure(repository, objMyConsoleAppender);

        }

        private static void ConfigureEventLogAppender(ILoggerRepository repository)

        {

            MyEventLogAppender objMyEventLogAppender = new MyEventLogAppender("MyApp", "MyLog");

            objMyEventLogAppender.Threshold = Level.All;

            BasicConfigurator.Configure(repository, objMyEventLogAppender);

        }

        private static void ConfigureFileAppender(ILoggerRepository repository)

        {

            MyRollingFileAppender objMyRollingFileAppender = new MyRollingFileAppender(repository.Name);

            objMyRollingFileAppender.Threshold = Level.All;

            objMyRollingFileAppender.ActivateOptions();

            BasicConfigurator.Configure(repository, objMyRollingFileAppender);

        }

    }

    sealed class MyRollingFileAppender : RollingFileAppender

    {

        public MyRollingFileAppender(string appName)

        {

            //setting the properties relevant to the log files

            this.Name = "MyLogFile";

            this.File = appName + ".log";

            this.AppendToFile = true;

            this.MaximumFileSize = "10000KB";

            this.MaxSizeRollBackups = 50;

            this.Layout = new PatternLayout(@"%date [%thread] %-5level %logger [%ndc] - %message%newline");

        }

    }

    sealed class MyEventLogAppender : EventLogAppender

    {

        public MyEventLogAppender(string appName, string logName)

        {

            //setting the properties relevant to event logs

            this.Name = "AfpEventLogAppender";

            this.ApplicationName = appName;

            this.MachineName = ".";

            this.LogName = logName;

            this.Layout = new PatternLayout(

                @"%date [%thread] %-5level %logger %method() [%ndc] - %message%newline");

        }

    }

    sealed class MyConsoleAppender : ConsoleAppender

    {

        public MyConsoleAppender()

        {

            //setting the properties relevant to the console

            Name = @"ConsoleAppender";

            Layout = new PatternLayout(

                @"%date [%thread] %-5level %logger %method() [%ndc] - %message%newline");

        }

    }

    public interface MyInterface

    {

        void Test();

    }

    public class Cls : MyInterface

    {

        public void Test()

        {

            throw new NotImplementedException();

        }

    }

}