0Logging.cs

public class SomeClass {

  public void SomeMethod() {
    this.Log().Info("Here is a log message with params which can be in Razor Views as well: '{0}'".FormatWith(typeof(SomeClass).Name));
  }

}

1TheBootStrapRegistration.cs

 Log.InitializeWith<Log4NetLog>();

ILogger.cs

public interface ILogger
	{
		void Debug(string message);
		void Error(string message);
		void Error(string message, Exception exception);
		void Fatal(string message);
		void Fatal(string message, Exception exception);
		void Info(string message);
		void InitializeFor(string loggerName);
		void Warning(string message);
	}

	/// <summary>
	///     Ensures a default constructor for the logger type
	/// </summary>
	/// <typeparam name="T"></typeparam>
	public interface ILogger<T> where T : new()
	{
	}

Log.cs

/// <summary>
	/// Logger type initialization
	/// </summary>
	public static class Log
	{
		private static Type _logType = typeof(NullDebugLogger);
		private static ILogger _logger;

		/// <summary>
		/// Sets up logging to be with a certain type
		/// </summary>
		/// <typeparam name="T">The type of ILog for the application to use</typeparam>
		public static void InitializeWith<T>() where T : ILogger, new()
		{
			_logType = typeof(T);
		}

		/// <summary>
		/// Sets up logging to be with a certain instance. The other method is preferred.
		/// </summary>
		/// <param name="loggerType">Type of the logger.</param>
		/// <remarks>This is mostly geared towards testing</remarks>
		public static void InitializeWith(ILogger loggerType)
		{
			_logType = loggerType.GetType();
			_logger = loggerType;
		}

		/// <summary>
		/// Initializes a new instance of a logger for an object.
		/// This should be done only once per object name.
		/// </summary>
		/// <param name="objectName">Name of the object.</param>
		/// <returns>ILog instance for an object if log type has been initialized; otherwise null</returns>
		public static ILogger GetLoggerFor(string objectName)
		{
			var logger = _logger;

			if (_logger == null)
			{
				logger = Activator.CreateInstance(_logType) as ILogger;
				if (logger != null)
				{
					logger.InitializeFor(objectName);
				}
			}

			return logger;
		}
	}

Log4NetLogger.cs

using System;
using log4net;
using log4net.Config;

[assembly: XmlConfigurator(Watch = true)]
namespace Some.Namespace {

/// <summary>
/// Log4net logger implementing special ILog class
/// </summary>
public class Log4NetLog : ILog, ILog<Log4NetLog>
{
    private global::log4net.ILog _logger;
    
    public void InitializeFor(string loggerName)
    {
        _logger = LogManager.GetLogger(loggerName);
    }

    public void Debug(string message, params object[] formatting)
    {
        if (_logger.IsDebugEnabled) _logger.DebugFormat(DecorateMessageWithAuditInformation(message), formatting);
    }

    public void Debug(Func<string> message)
    {
        if (_logger.IsDebugEnabled) _logger.Debug(DecorateMessageWithAuditInformation(message.Invoke()));
    }

    public void Info(string message, params object[] formatting)
    {
       if (_logger.IsInfoEnabled) _logger.InfoFormat(DecorateMessageWithAuditInformation(message), formatting);
    }

    public void Info(Func<string> message)
    {
        if (_logger.IsInfoEnabled) _logger.Info(DecorateMessageWithAuditInformation(message.Invoke()));
    }

    public void Warn(string message, params object[] formatting)
    {
       if (_logger.IsWarnEnabled) _logger.WarnFormat(DecorateMessageWithAuditInformation(message), formatting);
    }

    public void Warn(Func<string> message)
    {
        if (_logger.IsWarnEnabled) _logger.Warn(DecorateMessageWithAuditInformation(message.Invoke()));
    }

    public void Error(string message, params object[] formatting)
    {
        // don't need to check for enabled at this level
        _logger.ErrorFormat(DecorateMessageWithAuditInformation(message), formatting);
    }

    public void Error(Func<string> message)
    {
        // don't need to check for enabled at this level
         _logger.Error(DecorateMessageWithAuditInformation(message.Invoke()));
    }

    public void Fatal(string message, params object[] formatting)
    {
        // don't need to check for enabled at this level
        _logger.FatalFormat(DecorateMessageWithAuditInformation(message), formatting);
    }

    public void Fatal(Func<string> message)
    {
        // don't need to check for enabled at this level
        _logger.Fatal(DecorateMessageWithAuditInformation(message.Invoke()));
    }

    public string DecorateMessageWithAuditInformation(string message)
    {
        string currentUserName = ApplicationParameters.GetCurrentUserName();
        if (!string.IsNullOrWhiteSpace(currentUserName))
        {
            return "{0} - {1}".FormatWith(message, currentUserName);
        }

        return message;
    }

}
}

LoggingExtensions.cs

	/// <summary>
	/// Extensions to help make logging awesome
	/// </summary>
	public static class LoggingExtensions
	{
		/// <summary>
		/// Concurrent dictionary that ensures only one instance of a logger for a type.
		/// </summary>
		private static readonly Lazy<ConcurrentDictionary<string, ILogger>> _dictionary = new Lazy<ConcurrentDictionary<string, ILogger>>(() => new ConcurrentDictionary<string, ILogger>());

		
		public static ILogger Log<T>(this T type)
		{
			var objectName = typeof(T).FullName;
			return Log(objectName);
		}

		public static ILogger Log(this string objectName)
		{
			return _dictionary.Value.GetOrAdd(objectName, Logging.Log.GetLoggerFor);
		}

		public static void Debug(this ILogger logger, string message, params object[] args)
		{
			logger.Debug(string.Format(message,args));
		}

		public static void Info(this ILogger logger, string message, params object[] args)
		{
			logger.Debug(string.Format(message, args));
		}

		public static void Warning(this ILogger logger, string message, params object[] args)
		{
			logger.Debug(string.Format(message, args));
		}

		public static void Error(this ILogger logger, string message, params object[] args)
		{
			logger.Debug(string.Format(message, args));
		}

		public static void Fatal(this ILogger logger, string message, params object[] args)
		{
			logger.Debug(string.Format(message, args));
		}
	}

NullLogger.cs

/// <summary>
	///     Default logger 
	/// </summary>
	public class NullLogger : ILogger
	{
		public void Debug(string message)
		{
			
		}

		public void Error(string message)
		{
			
		}

		public void Error(string message, Exception exception)
		{
			
		}

		public void Fatal(string message)
		{
			
		}

		public void Fatal(string message, Exception exception)
		{
			
		}

		public void Info(string message)
		{
			
		}

		public void InitializeFor(string loggerName)
		{
			
		}

		public void Warning(string message)
		{
			
		}
	}

StringExtensions.cs

public static class StringExtensions
{
    /// <summary>
    /// Formats string with the formatting passed in. This is a shortcut to string.Format().
    /// </summary>
    /// <param name="input">The input.</param>
    /// <param name="formatting">The formatting.</param>
    /// <returns>A formatted string.</returns>
    public static string FormatWith(this string input, params object[] formatting)
    {
        return string.Format(input, formatting);
    }

}