標籤:c# 繼承 虛函數 override new
首先看下面的代碼:
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;}}}
namespace Test{public class OnceChild : Base{protected override int Operate(int x, int y){return x - y;}}}
namespace Test{public class TwiceChild : OnceChild{protected override int Operate(int x, int y){return x * y;}}}
namespace Test{public class ThirdChild : TwiceChild{}}
namespace Test{public class ForthChild : ThirdChild{protected new int Operate(int x, int y){return x / y;}}}
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();}}}
看結果:
從結果中可以看出:使用override重寫之後,調用的函數是派生的最遠的那個函數,使用new重寫則是調用new之前的派生的最遠的函數,即把new看做沒有重寫似的。
c#繼承中的函數調用