namespace MefContribSample
{
    class Program
    {
        static void Main(string[] args)
        {
            var provider =
            new FluentDefinitionProvider();
            provider
                .Import<ServiceHost>(s => s.Service)
                .WithContract(typeof(ServiceHost))
                .Export<MessageService>(m => m)
                .WithContract(typeof(IMessageService));

            var catalog = new DefinitionProviderPartCatalog<FluentDefinitionProvider>(provider);
        }
    }

    public class ServiceHost
    {
        public Export<IMessageService> Service { get; set; }
    }

    public class MessageService : IMessageService
    {
        public void Execute()
        {
            Console.WriteLine("Executed");
        }
    }

    public interface IMessageService
    {
        void Execute();
    }