c#继承中的函数调用_.NET_编程开发_程序员俱乐部

class="FocusMe">首先看下面的代码:

? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 using System;   namespace Test {     public class Base     {         public void Print()         {             Console.WriteLine(Operate(8, 4));         }           protected virtual int Operate(int x, int y)         {             return x + y;         }     } } ? 1 2 3 4 5 6 7 8 9 10 namespace Test {     public class OnceChild : Base     {         protected override int Operate(int x, int y)         {             return x - y;         }     } } ? 1 2 3 4 5 6 7 8 9 10 namespace Test {     public class TwiceChild : OnceChild     {         protected override int Operate(int x, int y)         {             return x * y;         }     } } ? 1 2 3 4 5 6 namespace Test {     public class ThirdChild : TwiceChild     {     } } ? 1 2 3 4 5 6 7 8 9 10 namespace Test {     public class ForthChild : ThirdChild     {         protected new int Operate(int x, int y)         {             return x / y;         }     } } ? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 namespace Test {     class Program     {         static void Main(string[] args)         {             Base b = null;             b = new Base();             b.Print();             b = new OnceChild();             b.Print();             b = new TwiceChild();             b.Print();             b = new ThirdChild();             b.Print();             b = new ForthChild();             b.Print();         }     } }

看结果：

从结果中可以看出：使用override重写之后，调用的函数是派生的最远的那个函数，使用new重写则是调用new之前的派生的最远的函数，即把new看做没有重写似的。