大括号在 PowerShell 变量声明中是否意味着什么? [英] Do curly braces mean anything in PowerShell variable declaration?

问题描述

我遇到过这样声明的变量(或参数):

I have come across variables (or parameters) being declared like this:

${var_name} = "Hello world!"

据我所知，这与以下内容没有什么不同:

As far as I can tell, this is no different to the following:

$var_name = "Hello world!"

我想知道第一个示例中的 {} 大括号是否有任何作用或含义.它们会改变变量的行为吗?

I am wondering if the {} braces in the first example do or mean anything. Do they change the behaviour of the variable?

推荐答案

PowerShell 变量名称中的大括号允许在变量名称中使用任意字符.如果变量名中没有病态"字符，则不需要大括号，没有任何作用.

Curly braces in PowerShell variable names allow for arbitrary characters in the name of the variable. If there are no "pathological" characters in the variable name, then the braces are not needed and have no effect.

您会发现生成的"代码有时会使用花括号，因为它们保证变量名有效.

You'll find that "generated" code will sometimes use curly braces because they guarantee that the variable name is valid.

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