Item 23: Understand How Interface Methods Differ from Virtual Methods(Effective C#)

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 
 6 namespace EffectiveCSharpItem23
 7 {
 8     interface IMsg 
 9     {
10         void Message();
11     }
12 
13     public class MyClass : IMsg 
14     {
15         public void Message() 
16         {
17             Console.WriteLine("MyClass");
18         }
19     }
20 
21     public class MyDerivedClass : MyClass, IMsg
22     {
23         public new void Message() 
24         {
25             Console.WriteLine("MyDerivedClass");
26         }
27     }
28 
29     class Program
30     {
31         static void Main(string[] args)
32         {
33             MyDerivedClass d = new MyDerivedClass();
34             d.Message();
35             IMsg m = d as IMsg;
36             m.Message();
37 
38             MyClass c = d as MyClass;
39             c.Message();
40         }
41     }
42 }