调用基本方法和派生方法 [英] calling both base and derived methods

问题描述

在C＃和C ++中，是否可以调用具有相同签名的方法的基本版本和派生版本，而不是覆盖基类版本？

解决方案

在C＃中，不是如果派生方法是覆盖，而是如果它标记为 new 你必须小心使用这个结构虽然，因为它不是真正的你的对象的消费者预期会发生在大多数情况下;

  static class Program 
 {
 static void Main（）
 {
 Base baseObject = new Derived（）; 
 Derived derivedObject = new Derived（）; 
 Console.Write（derivedObject.Test（））; 
 Console.Write（baseObject.Test（））; 
 Console.Write（（（Base）derivedObject）.Test（））; 
} 
} 
 
 class Base 
 {
 public virtual int Test（）
 {
 return 1; 
} 
} 
 
 class Derived：Base 
 {
 public new int Test（）
 {
 return 2; 
} 
} 
  

in both C# and C++, is it possible to call both base and derived versions of a method with the same signature instead of overriding the base class version?

解决方案

In C#, not if the derived method is an override, but yes if it is marked as new. You have to be careful when using this construct though, as it isn't really what a consumer of your object would expect to happen in most cases;

static class Program
{
    static void Main()
    {
        Base baseObject = new Derived();
        Derived derivedObject = new Derived();
        Console.Write(derivedObject.Test());
        Console.Write(baseObject.Test());
        Console.Write(((Base)derivedObject).Test());
    }
}

class Base
{
    public virtual int Test()
    {
        return 1;
    }
}

class Derived : Base
{
    public new int Test()
    {
        return 2;
    }
}

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