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

 using System;
 using System.Collections.Generic;
 using System.Text;
 namespace ConsoleApp1
 {
         public class BaseFather
         {
                 public BaseFather()
                 {
                         Console.WriteLine("this is not arguments in base father constructor");
                 }
                 public BaseFather(string arg)
                 {
                         Console.WriteLine("there is one argument in base father constructor");
                 }
         }
         public class Base :    BaseFather
         {
                 public Base() : base() // 继承无参构造函数
                 {
                         Console.WriteLine("no arguments in base constructor");
                 }
                 public Base(string a) : base(a) // 继承有参构造函数
                 {
                         Console.WriteLine("there is one argument in base constructor");
                 }
                 static void Main(string[] args)
                 {
                         Base B1 = new Base();
                         Base B2 = new Base("s");
                         Console.ReadKey();
                 }
         }
 }

结果