1 namespace TestMEF
 2 {
 3     public interface IBookService
 4     {
 5         void GetBookName();
 6     }
 7 
 8     [Export(typeof(IBookService))]
 9     public class ComputerBookService : IBookService
10     {
11         public void GetBookName()
12         {
13             Console.WriteLine("Computer Book");
14         }
15     }
16 
17     [Export(typeof(IBookService))]
18     public class EnglishBookService : IBookService
19     {
20         public void GetBookName()
21         {
22             Console.WriteLine("English Book");
23         }
24     }
25 
26     class Program
27     {
28         //[Import]
29         //public IBookService Service { get; set; }
30 
31         [ImportMany]
32         public List<IBookService> ServiceList { get; set; }
33  
34         private void Compose()
35         {
36             var catalog = new AssemblyCatalog(Assembly.GetExecutingAssembly());
37             var container = new CompositionContainer(catalog);
38             container.ComposeParts(this);
39         }
40 
41         static void Main(string[] args)
42         {
43             Program p = new Program();
44             p.Compose();
45 
46             //p.Service.GetBookName();
47 
48             foreach (IBookService service in p.ServiceList)
49             {
50                 service.GetBookName();
51             }         
52 
53             Console.ReadLine();
54         }
55     }
56 }