使用“新”的班级成员中的关键字。 [英] Use of the "new" keyword in class members.
问题描述
任何人都可以向我解释一下新的使用情况。关键字（Shadows
VB中的
）。
我想我明白它是如何工作的但是我无法弄清楚你为什么这么做b $ b会用它。为什么要在派生的
类中声明一个变量，其名称与基类中的名称相同但是具有不同的含义
意思是什么？
任何人都可以想到这个场景吗？
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Can anyone explain to me a meningfull use of the "new" keyword (Shadows
in VB).
I think i understand how it works fully but i cant figure out why you
would use it. Why would you want to declare a variable in a derived
class with the same name as in the base class but with a diffrent
meaning?
Anyone can think of a scenario for this?
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推荐答案
Ola Johansson< ol*@whoa.nu>写道：
Ola Johansson <ol*@whoa.nu> wrote:
任何人都可以向我解释一下新的使用情况。关键字（VB中的阴影
）。
我想我理解它是如何工作的但我无法弄清楚为什么你会使用它。为什么要在派生的
类中声明一个变量，其名称与基类中的名称相同但具有不同的含义？
任何人都可以想到一个场景这个？
Can anyone explain to me a meningfull use of the "new" keyword (Shadows
in VB).
I think i understand how it works fully but i cant figure out why you
would use it. Why would you want to declare a variable in a derived
class with the same name as in the base class but with a diffrent
meaning?
Anyone can think of a scenario for this?
是的。假设你派生自另一个类，在写作时没有一个名为Foo的成员。你包括一个，它就会成为你公共界面的一部分。现在，稍后基类获得
a成员称为Foo - 您有三种选择：
1）使用new隐藏基本成员
2）重命名你的会员
3）只使用班级的旧版本
2和3可能不是可行的选择，离开第一个。发现自己总是一个不幸的情况，但这就是为什么
就在那里。
-
Jon Skeet - < sk *** @ pobox.com>
http://www.pobox.com/~skeet
如果回复小组，请不要给我发邮件
Yes. Suppose you derive from another class, which at the time of
writing doesn''t have a member called Foo. You include one, and it
becomes part of your public interface. Now, later the base class gains
a member called Foo - you have three choices:
1) Hide the base member using "new"
2) Rename your member
3) Only use the old version of the class
2 and 3 may well not be viable options, leaving the first one. It''s
always an unfortunate situation to find yourself in, but that''s why
it''s there.
--
Jon Skeet - <sk***@pobox.com>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too
假设我设计了自己的消息框表单，并实现了我自己的Show（）方法。我
不要让他们使用底座所以我用new来说我隐藏底座和
使用我自己的。
" Ola约翰森" < ol*@whoa.nu>在留言中写道
news：uQ ************** @ TK2MSFTNGP12.phx.gbl ...
Say I design my own messagebox form, and implement my own Show() method. I
dont want them to use the base so I use new to say im hiding the base and
using my own.
"Ola Johansson" <ol*@whoa.nu> wrote in message
news:uQ**************@TK2MSFTNGP12.phx.gbl...
任何人都可以向我解释一个meningfull使用新的关键字（VB中的阴影
）。
我想我理解它是如何工作的但我无法弄清楚为什么你会使用它。为什么要在派生的
类中声明一个变量，其名称与基类中的名称相同但具有不同的含义？
任何人都可以想到一个场景这个？
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Can anyone explain to me a meningfull use of the "new" keyword (Shadows
in VB).
I think i understand how it works fully but i cant figure out why you
would use it. Why would you want to declare a variable in a derived
class with the same name as in the base class but with a diffrent
meaning?
Anyone can think of a scenario for this?
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Don''t just participate in USENET...get rewarded for it!
< di ********@discussion.microsoft.com>写道：
<di********@discussion.microsoft.com> wrote:
假设我设计了自己的消息框表单，并实现了我自己的Show（）方法。我不希望他们使用底座所以我使用new来说我隐藏底座和
使用我自己的。
Say I design my own messagebox form, and implement my own Show() method. I
dont want them to use the base so I use new to say im hiding the base and
using my own.
我建议*不*那样做。 IMO，有意识地隐藏会员，这不是一个坏主意。我只想给会员一个
不同的名字。否则用户可能会感到困惑，并相信他们会打电话给原来的。
-
Jon Skeet - < sk *** @ pobox.com>
http：// www。 pobox.com/~skeet
如果回复小组，请不要给我发邮件
I would suggest *not* doing that. Hiding members deliberately when
there''s no need to is a bad idea, IMO. I would just give the member a
different name. Otherwise users may well get confused and believe
they''re calling the original one.
--
Jon Skeet - <sk***@pobox.com>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too
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