base 关键字

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Text;
 4 
 5 namespace ConsoleApplication14
 6 {
 7     class Program
 8     {
 9         static void Main(string[] args)
10         {
11 
12             B b = new B();
13             A A = b;
14             A.show();
15             b.show();
16             // 输出
17 
18             //B...
19 
20             //A...
21 
22             //B...
23 
24             //A...
25 
26 
27 
28             Console.ReadKey();
29         }
30     }
31 
32 
33     class A {
34 
35         public virtual void show() {
36 
37             Console.WriteLine("A...
");
38         
39         }
40     
41     }
42     class B:A
43     {
44 
45         public  override  void show()
46         {
47 
48             Console.WriteLine("B...
");
49             base.show();
50 
51         }
52 
53     }
54 }
base 常用于在派生类初始化时和基类进行通讯