已经引用变量时使用'ref' [英] Using 'ref' when already reference variable

问题描述

如果对象已经是引用变量，将对象传递给带有'ref''

关键字的方法会有什么危害吗？如果没有，是否有任何好处？

Is there any harm in passing an object into a method with the ''ref''
keyword if the object is already a reference variable? If not, is
there any benefit?

推荐答案

Doug写道：

如果对象已经是引用变量，将对象传递给带有'ref''
关键字的方法有什么危害吗？如果没有，是否有任何好处？

Is there any harm in passing an object into a method with the ''ref''
keyword if the object is already a reference variable? If not, is
there any benefit?

这是对象的默认值。

That is the default for objects.

对对象使用''ref''意味着该方法可以改变指向哪个对象
。所以，是的 - 使用''ref''会有一些伤害，当你没有
想让方法改变指向哪个对象时。

但你可能没有选择 - 如果方法有''ref''参数，你必须

在参数上使用''ref''关键字（在C＃中） 。

-

David Anton
www.tangiblesoftwaresolutions.com

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" Doug"写道：

Using ''ref'' for an object means that the method may change which object is
being pointed to. So, yes - there is some harm in using ''ref'' when you don''t
want to allow the method to change which object is being pointed to.

But you may not have a choice - if the method has a ''ref'' param, you must
use the ''ref'' keyword on the argument (in C#).
--
David Anton
www.tangiblesoftwaresolutions.com
Instant C#: VB.NET to C# Converter
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"Doug" wrote:

如果对象已经是引用变量，将对象传递给带有'ref''
关键字的方法会有什么危害吗？如果没有，是否有任何好处？

Is there any harm in passing an object into a method with the ''ref''
keyword if the object is already a reference variable? If not, is
there any benefit?

" John A. Bailo" < JA ***** @ texeme.com>写道：

"John A. Bailo" <ja*****@texeme.com> wrote:

如果对象已经使用''ref''
关键字将对象传递给方法有什么危害吗参考变量？如果没有，是否有任何好处？

Is there any harm in passing an object into a method with the ''ref''
keyword if the object is already a reference variable? If not, is
there any benefit?

这是对象的默认设置。

That is the default for objects.

其实是默认的（对于一切）是* by-value *传递。见

< http://www.yoda.arachsys.com/csharp/parameters.html> ;.

Actually the default (for everything) is *by-value* passing. See
<http://www.yoda.arachsys.com/csharp/parameters.html>.

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