using System;
using System.Collections.Generic;
using System.Composition;
using System.Composition.Hosting;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication1
{
    class Program
    {
        [Export]
        public sealed class A
        {
            [Import]
            public B B { get; set; }

            [OnImportsSatisfied]
            public void OnImportsSatisfied()
            {
                Console.WriteLine("From A");
            }
        }

        [Export]
        public sealed class B
        {
            [Import]
            public C C { get; set; }

            [OnImportsSatisfied]
            public void OnImportsSatisfied()
            {
                Console.WriteLine("From B");
            }
        }

        [Export]
        public sealed class C
        {
            [OnImportsSatisfied]
            public void OnImportsSatisfied()
            {
                Console.WriteLine("From C");
            }
        }

        static void Main(string[] args)
        {
            using(var container = new ContainerConfiguration().WithAssembly(Assembly.GetAssembly(typeof(A))).CreateContainer())
            {
                container.GetExport<A>();
            }
        }
    }
}