mRemoteNG/mRemoteV1/App/Logger.cs

using log4net;
using log4net.Appender;
using log4net.Config;
using log4net.Repository;
using System.IO;

namespace mRemoteNG.App
{
    public class Logger
    {
        private static Logger _logger = null;
        private ILog _log;

        public static ILog GetSingletonInstance()
        {
            if (_logger == null)
                _logger = new Logger();
            return _logger._log;
        }

        private Logger()
        {
            this.Initialize();
        }

        private void Initialize()
        {
            XmlConfigurator.Configure();
            string logFile = BuildLogFilePath();

            ILoggerRepository repository = LogManager.GetRepository();
            IAppender[] appenders = repository.GetAppenders();
            
            FileAppender fileAppender = default(FileAppender);
            foreach (IAppender appender in appenders)
            {
                fileAppender = appender as FileAppender;
                if (!(fileAppender == null || fileAppender.Name != "LogFileAppender"))
                {
                    fileAppender.File = logFile;
                    fileAppender.ActivateOptions();
                }
            }
            _log = LogManager.GetLogger("Logger");
        }

        private static string BuildLogFilePath()
        {
            string logFilePath = "";
            #if !PORTABLE
			logFilePath = Path.Combine(System.Environment.GetFolderPath(System.Environment.SpecialFolder.LocalApplicationData), System.Windows.Forms.Application.ProductName);
            #else
            logFilePath = System.Windows.Forms.Application.StartupPath;
            #endif
            string logFileName = Path.ChangeExtension(System.Windows.Forms.Application.ProductName, ".log");
            string logFile = Path.Combine(logFilePath, logFileName);
            return logFile;
        }
    }
}