C#-构造函数中base


base  
是调用基类的有参数构造函数 


因为在子类不能直接继承父类的构造函数

 

实例

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Text;
 4 namespace ConsoleApp1
 5 {
 6         public class BaseFather
 7         {
 8                 public BaseFather()
 9                 {
10                         Console.WriteLine("this is not arguments in base father constructor");
11                 }
12                 public BaseFather(string arg)
13                 {
14                         Console.WriteLine("there is one argument in base father constructor");
15                 }
16         }
17         public class Base :    BaseFather
18         {
19                 public Base() : base() // 继承无参构造函数
20                 {
21                         Console.WriteLine("no arguments in base constructor");
22                 }
23                 public Base(string a) : base(a) // 继承有参构造函数
24                 {
25                         Console.WriteLine("there is one argument in base constructor");
26                 }
27                 static void Main(string[] args)
28                 {
29                         Base B1 = new Base();
30                         Base B2 = new Base("s");
31                         Console.ReadKey();
32                 }
33         }
34 }

结果