using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

    }

}

​

public class LoggingFactory

    {

        private static ILogger _logger;

​

        public static void InjectLogger(ILogger logger)

        {

            _logger = logger;

        }

​

        public static ILogger GetLogger()

        {

            if (_logger == null)

            {

                _logger = new FileLogger();

            }

​

            return _logger;

        }

    }