派生类使用基类初始化 [英] Derived class initialize with base class

问题描述

大家好，

我有一个非常有趣的问题。使用基类初始化派生类。

我的意思是有两个名为DerivedClass和BaseClass的类。 DerivedClass由BaseClass派生。我想做类似的事情

Hi people,
I have very interesting question. initialization of derived class with its base class.
I mean there are two class named DerivedClass and BaseClass. DerivedClass derived by BaseClass. I want to do something like that

class DerivedClass
{
   public DerivedClass(BaseClass bc)
   {
        base = bs;
   }
}

可能吗？

is that possible?

推荐答案

不，我觉得你很困惑。

No, I think you are confused.

class DerivedClass
{
   public DerivedClass(BaseClass bc)
   {
        base = bs;
   }
}

您的DerivedClass与BaseClass无关 - 除了通过对象，他们两者都来源于。 （忽略拼写错误bs/bc）

您更可能想说：

Your "DerivedClass" is not related to "BaseClass" - except via Object which they both derive from. (Ignoring the typo "bs" / "bc")
You more likely want to say:

class DerivedClass : BaseClass
{
   public DerivedClass(BaseClass bc)
   {
        base = bc;
   }
}

哪个派生自基地。但在这种情况下，您不需要从Base Class实例创建DerivedClass实例，因为Derived类是Baseclass的类型 - 它已经包含基类的所有字段，属性，事件和方法。 />


你所拥有的基本上是一个复制构造函数（你可以做），但除非你的系统设计的其余部分相当奇怪，否则它应该是无关紧要的。

更好的编码方式是：

Which does derive from the base. But in that case, you don't need to create a DerivedClass instance from a Base Class instance, because Derived class is a type-of Baseclass - it already contains all the fields, properties, event and methods of the base class.

What you have there is basically a copy constructor (which you can do) but which should be irrelevant unless the rest of your system design is rather odd.
A better way to code it would be:

class DerivedClass : BaseClass
    {
    public DerivedClass(BaseClass bc) : base (bc)
        {
        }
    }

但即便如此，这也是一个奇怪的想法。



什么是你想要这样做你认为你需要这个吗？

But even then it's an odd idea.

What are you trying to do that you think you need this?

我认为这更相关：



类DerivedClass：BaseClass

{

string som eOtherInfo;

public DerivedClass（BaseClass bc）

{

base = bc;

}

}



即初始化字段的Derived类字段的BaseClass-ness。



我不确定这是否可以在C＃中完成。在C ++中，我想我可以做*（基于类）这个= bc;



在C＃中，我想你可以做到：

I think this is more relevant:

class DerivedClass : BaseClass
{
string someOtherInfo;
public DerivedClass(BaseClass bc)
{
base = bc;
}
}

I.e. initialize the BaseClass-ness of the Derived class field for field.

I am not sure if this can be done in C#. In C++ I think I could have done *(BasedClass)this = bc;

In C#, I think you might be able to do:

class DerivedClass : BaseClass
{
   string someOtherInfo;
   public DerivedClass(BaseClass bc) : base(bc)
   {
   }
}

但是，这需要在BaseClass中有这样的构造函数。

However, that requires that there is such a constructor in BaseClass.

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