ref和out之间的区别？ [英] Difference between ref and out?

问题描述

我一直在使用ref关键字作为将字符串传递给方法的方式，因为

引用，所以在方法中我不必手动返回

修改后的版本传递给方法的内容，我只需要为ref''d参数赋予一个新值

。但是，我已经了解到''out''

关键字似乎做了这样的事情。


我有点困惑;对于我的意图，''ref''和

''out'之间的实际区别是什么？


谢谢，

Jon

I''ve been using the ref keyword as a way of passing strings to methods as
references so that in the method I don''t have to manually return the
modified "version" of what was passed into the method, I just have to assign
a new value to the ref''d argument. However, I''ve learned that the ''out''
keyword seems to do something just like this.

I''m kind of confused; what''s the practical difference between ''ref'' and
''out'' for my intents?

Thanks,
Jon

推荐答案

Jon Davis写道：

Jon Davis wrote:

我有点困惑;对于我的意图，'ref''
和'out'之间的实际区别是什么？

I''m kind of confused; what''s the practical difference between ''ref''
and ''out'' for my intents?

A" ref"在调用函数之前，参数需要初始化; out

不会。

以下内容无法编译：


string a;

f（ref a）;

以下将编译：

string a;

g（out a）;

-

问候

Jochen

A "ref" parameters need initialization BEFORE you call the function; "out"
does not.
The following will not compile:

string a;
f(ref a);
The following will compile:
string a;
g(out a);
--
Greetings
Jochen

必须初始化要作为ref参数发送的变量。

它的目的是在传递方法中进行更改。


作为out参数发送的变量不需要初始化

在传递给方法之前，因为它必须在该方法中分配。

它不是要更改，而是要分配（或重新分配）

的传递方式。


-

问候，

DennisJDMyrén

Oslo Kodebureau

" Jon Davis" < jo*@REMOVE.ME.jondavis.net>在消息中写道

news：e

A variable to be sent as ref parameter must be initialized.
It is intended to be changed in the method to which it is passed.

A variable to be sent as out parameter dont need to be initialized
before being passed to a method, because it must be assigned in that method.
It is not intended to be changed, but intended to be assigned(or reassigned)
in the method to which it is passed.

--
Regards,
Dennis JD Myrén
Oslo Kodebureau
"Jon Davis" <jo*@REMOVE.ME.jondavis.net> wrote in message
news:e

************** @ tk2msftngp13.phx.gbl ...

**************@tk2msftngp13.phx.gbl...

我一直在使用ref关键字作为一种方法将字符串传递给方法作为
引用，这样在方法中我不必手动返回
修改后的 ;版本"传递给方法的内容，我只需要
为ref''d参数分配一个新值。但是，我已经知道''out''
关键字似乎就是这样做的。

我有点困惑;对于我的意图，''ref''和
''out'之间的实际区别是什么？

谢谢，
Jon

I''ve been using the ref keyword as a way of passing strings to methods as
references so that in the method I don''t have to manually return the
modified "version" of what was passed into the method, I just have to assign a new value to the ref''d argument. However, I''ve learned that the ''out''
keyword seems to do something just like this.

I''m kind of confused; what''s the practical difference between ''ref'' and
''out'' for my intents?

Thanks,
Jon

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