Off the record

using System;
using System.ComponentModel.Composition;
using System.ComponentModel.Composition.Hosting;
using System.Reflection;

namespace MEF
{
    class Program
    {
        
        static void Main(string[] args)
        {

            MyClassWhereIDoLogging m = new MyClassWhereIDoLogging();

            // initializes the MEF "container"
            InitializeMEF(m);

            m.myLogger.logStuff("Yes, my logger has been injected !");
        }

        private static void InitializeMEF(object obj)
        {
            var catalog = new AssemblyCatalog(Assembly.GetExecutingAssembly());
            var container = new CompositionContainer(catalog);
            container.ComposeParts(obj);
        }
    }

    class MyClassWhereIDoLogging
    {
        [Import (typeof(IMyLogger))]
        public IMyLogger myLogger { get; set; }
    }

    interface IMyLogger
    {
        void logStuff(string message);
    }

    [Export(typeof(IMyLogger))]
    class MyLogger : IMyLogger
    {
        public void logStuff(string message)
        {
            Console.WriteLine("LOGSTUFF XXXXX " + message);
        }
    }
}