class Program
    {
        [Import]
        ILogger logger;

        void Compose()
        {
            var catalog = new AssemblyCatalog(this.GetType().Assembly);
            var container = new CompositionContainer(catalog);
            container.ComposeParts(this);
        }

        public static void Main(string[] args)
        {
            var p = new Program();
            p.Compose();

            p.logger.LogMessage("hello world");
        }
    }

    interface ILogger
    {
        void LogMessage(string msg);
    }

    [Export(typeof(ILogger))]
    class ConsoleLogger : ILogger
    {

        public void LogMessage(string msg)
        {
            Console.WriteLine(DateTime.Now + ": " + msg);
        }
    }