关于c＃中的虚拟类 [英] About Virtual Classes in c#

问题描述

大家好，



在很多采访中，我面临一个小小的困惑。

我有两个类ChildClass和Base Class

Hi Guys,

In lot of interview I am facing a small confusion.
I am having two classes ChildClass and Base Class

class BaseClass
    {
        public virtual void Test()
        {
            Console.WriteLine("BaseClass:Test()");
        }
    }
    class ChildClass : BaseClass
    {
        public override void Test()
        {
            Console.WriteLine("ChildClass:Test()");
        }
    }

现在我的问题是什么是虚拟课程的使用

Now My Questions is what is the use of virtual classes

ChildClass B = new ChildClass();
B.Test();
BaseClass C = new ChildClass();
C.Test();

我可以在heritence中访问Test（）函数而且没有继承权也可以...那么继承的用途是什么。



请澄清我。



温馨的问候，

阿里

I can access Test() function with in heritence and without inheritence also na... Then what is the use of Inheritence.

Please clarify me.

Warm Regards,
Ali

推荐答案

你可以扩展一些基础子类中的功能。



http：// www .csharp-station.com / Tutorials / lesson08.aspx [ ^ ]



祝你好运！

you can extend some base functionality in a subclass.

http://www.csharp-station.com/Tutorials/lesson08.aspx[^]

good luck!

诀窍是你可以使用对基数的引用用于引用继承的类，并且在运行时，使用该引用调用虚函数时，将调用继承类中的重写函数。请考虑以下代码：

The trick is that you can use a reference to the base class to reference an inherited one and, at runtime, when you call a virtual function using that reference, the overridden one in the inherited class is called. Consider the code below:

class BaseClass
{
   public virtual void Test()
   {
      Console.WriteLine("BaseClass:Test()");
   }
}

class ChildClassA : BaseClass
{
   public override void Test()
   {
      Console.WriteLine("ChildClassA:Test()");
   }
}

class ChildClassB : BaseClass
{
   public override void Test()
   {
      Console.WriteLine("ChildClassB:Test()");
   }
}

现在假设您写的是这样的：

Now suppose that you write something like this:

BaseClass obj = new ChildClassA();
obj.Test();
obj = ChildClassB();
obj.Test()

你得到的输出是这样的：

The output that you get is something like this:

ChildClassA:Test()
ChildClassB:Test()

没有这样的作为虚拟课程的事情。

当然你必须把课程与方法混淆。

请阅读一些非常基本的课程关于面向对象编程的文档。

There is no such thing as a virtual class.
Surely you must confuse classes with methods.
Please read some very basic documentation about object orientated programming.

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