关于继承和构造函数的问题。 [英] Question about inheritance and constructors.
问题描述
我搜索了新闻组但找不到这个问题的答案，所以
我会继续发布它。
让我说我有一个A级，有几个不同的构造者......没什么''
特别。
现在，让我们说我有B级继承自A. B自动
获得A的所有属性和方法，但我无法利用任何
A'的构造函数而无需重新定义他们在B和委托。我确定
有一个很好的理由，但我发现它有点令人沮丧。
是否有一些语法我不熟悉的镜头
利用A构造函数而不必在B级镜像它们？
非常感谢。
-Kevin Buchan
I searched the news group and could not find an answer to this question, so
I''ll go ahead and post it.
Let''s say I have a class A with a couple different constructors... nothin''
special.
Now, let''s say that I have class B that inherits from A. B automagically
gets all of the properties and methods of A, but I cannot leverage any of
A''s contructors without redefining them on B and delegating. I''m sure that
there is a very good reason for this, but I find it a bit frustrating.
Is there, perhaps, some syntax shotcut that I''m not familiar with for
leveraging the A constructors without having to mirror them on class B?
Thanks so much.
-Kevin Buchan
推荐答案
IIRC，构造函数不是继承的。你的派生类必须使用MyBase关键字调用
基类的构造函数：
Public Sub New（）
' '调用基类构造函数
MyBase.New（）
结束子
IIRC, Constructors are not inherited. Your derived classes must call
the constructors of the base class using the MyBase keyword:
Public Sub New()
''Call base class constructor
MyBase.New()
End Sub
4月20日2005 06:32:59 -0700，Chris Dunaway < du ****** @ gmail.com>
写道：
On 20 Apr 2005 06:32:59 -0700, "Chris Dunaway" <du******@gmail.com>
wrote:
IIRC，构造函数不是继承的。派生类必须使用MyBase关键字调用基类的构造函数：
Public Sub New（）
''调用基类构造函数
MyBase.New （）
End Sub
IIRC, Constructors are not inherited. Your derived classes must call
the constructors of the base class using the MyBase keyword:
Public Sub New()
''Call base class constructor
MyBase.New()
End Sub
是的，这就是我一直在做的事情，但当你的基类有三个
构造函数时在
多个子类中复制和委托是一件令人讨厌的事。
Yup, that''s what I''ve been doing, but when your base class has three
constructors, it''s a bit of an annoyance to replicate and delegate in
multiple subclasses.
Jason Kendall写道：
Jason Kendall wrote:
2005年4月20日06:32:59 -0700，Chris Dunaway < du ****** @ gmail.com>
写道：
On 20 Apr 2005 06:32:59 -0700, "Chris Dunaway" <du******@gmail.com>
wrote:
IIRC，构造函数不是继承的。你的派生类必须
使用MyBase关键字调用基类的构造函数：
Public Sub New（）
''调用基类构造函数
MyBase.New（ ）
End Sub
IIRC, Constructors are not inherited. Your derived classes must callthe constructors of the base class using the MyBase keyword:
Public Sub New()
''Call base class constructor
MyBase.New()
End Sub
是的，这就是我一直在做的事情，但是当你的基类有三个
构造函数时，它就是在多个子类中复制和委托有点烦恼。
Yup, that''s what I''ve been doing, but when your base class has three
constructors, it''s a bit of an annoyance to replicate and delegate in
multiple subclasses.
我想如果有某种向导那就好了
自动引入给定基类方法的源，其中
可用。关于VS加载项的想法也许。
但我相信你可以看到为什么构造函数不会自动*
继承 - 派生类有-something-比基类更多，
因此几乎总是希望构造函数比基本的
类构造函数更多。在派生类的所有行为中，与其父类相比，实例化在
行为列表中肯定会有所不同。
-
Larry Lard
回复团体请
I suppose it would be nice if there were some kind of Wizard that
automatically brought in the source of a given base class method, where
available. An idea for a VS add-in maybe.
But I''m sure you can see why constructors aren''t *automatically*
inherited - a derived class has -something- more than the base class,
so will almost always want constructors that do more than the base
class constructors. Of all the behaviours of a derived class as
compared to its parent, instantiation is surely high on the list of
behaviours that will differ.
--
Larry Lard
Replies to group please
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