C# 关键字：base

 1     class Program  2  {  3         static void Main(string[] args)  4  {  5             Teacher t = new Teacher();  6 
 7  Console.ReadKey();  8  }  9  } 10 
11     class Person 12  { 13         public Person() 14  { 15             Console.WriteLine("我是人类"); 16  } 17  } 18 
19     class Teacher : Person 20  { 21         public Teacher() : base() 22  { 23             Console.WriteLine("我是老师"); 24  } 25     }

 1      class Program  2  {  3         static void Main(string[] args)  4  {  5             Teacher t = new Teacher();  6  t.SayHello();  7 
 8  Console.ReadKey();  9  } 10  } 11 
12     class Person 13  { 14         public Person() 15  { 16             Console.WriteLine("我是人类"); 17  } 18 
19         public virtual void SayHello() 20  { 21             Console.WriteLine("Hello"); 22  } 23  } 24 
25     class Teacher : Person 26  { 27         public Teacher() : base() 28  { 29             Console.WriteLine("我是老师"); 30  } 31 
32         public override void SayHello() 33  { 34             base.SayHello(); 35             Console.WriteLine("World"); 36  } 37     }