裁判在函数的变量参数不 [英] ref for variables not parameters in functions

问题描述

假设我有一个人类，并有以下几点：

Suppose I have a Person class and have the following:

Person A = new Person("Tom");
Person B = A;

有没有办法我可以改变它，这样如果我给你一个新的人到 B ， B =新的Person（哈利）， A 将指的是同一个实例吗？我知道你能做到这一点在 REF在函数参数赋值。

Is there a way I can change it so that if I assign a new Person to B, B = new Person("Harry"), A would be referring to the same instance too? I know you can do that in a ref parameter assignment in a function.

推荐答案

你想要的功能被称为REF当地人，它是不是在C＃的支持。

The feature you want is called "ref locals" and it is not supported in C#.

在CLR确实支持生成包括裁判本地人的代码，和几个几年前，我写了C＃的实验版本，有你想要的功能，只是为了看看它是否会工作。你可以这样做：

The CLR does support generating code that contains ref locals, and a few years ago I wrote an experimental version of C# that had the feature you want, just to see if it would work. You could do something like:

Person a = whatever;
ref Person b = ref a;

，然后像你说的，更改为B将改变一的内容。这两个变量成为相同的存储位置的别名。

and then as you say, changes to "b" would change the contents of "a". The two variables become aliases for the same storage location.

虽然是一个不错的功能和运作良好，我们决定不采取它为C＃。这是可能的，它仍然可能发生在语言的假想未来版本，但我也不会得到所有兴奋的期待;它可能不会发生。

Though it was a nice little feature and worked well, we decided to not take it for C#. It's possible that it could still happen in a hypothetical future version of the language, but I would not get all excited about it in expectation; it will probably not happen.

（请记住，所有Eric的有关未来的任何微软产品的假想版本思索的是仅供娱乐。）

(Remember, all of Eric's musings about hypothetical future versions of any Microsoft product are For Entertainment Purposes Only.)

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