在 Powershell 中更新变量内的变量 [英] Updating variables within variables in Powershell

问题描述

我对 Powershell 了解不多，但我尝试学习.你能帮我理解和解决我想做什么吗:

I don't know much about Powershell but I try to learn. Can you help me to understand and solve what I want to do:

$string1=""

$complicatedString1 = "This is a complicated $string1"
$complicatedString2 = "$complicatedString1 too"

$string1 = "Test"

$complicatedString1 -> Should state now: This is a complicated Test
$complicatedString2 -> Should state now: This is a complicated Test too.

$string1 = "question"

$complicatedString1 -> Should state now: This is a complicated question
$complicatedString2 -> Should state now: This is a complicated question too.

and so on.

这个想法听起来很简单:我想定义用作模板但内容可变的字符串.在这种情况下，我想操作 $string1 并更新 $complicatedstring 1 和 2，以便 $string1 的任何更改都反映在这些字符串中.

The idea sounds simple: I want to define strings that serve as templates, but with variable content. In this case I want to manipulate $string1 and update $complicatedstring 1 and 2 so that any change of $string1 gets reflected in those strings.

$string1 会频繁更改，目前我不知道如何将更改后的值放入这些字符串中.基本上只是等待更改的占位符.

$string1 would change frequently and at the moment I have no approach how get the changed values into those strings. Basically the're just placeholders to wait for being changed.

推荐答案

我不太确定，但我认为您的问题是关于使用模板字符串，您可以使用新的字符串插入进行更改.

I'm not quite sure, but I think your question is about using template strings you can alter using new strings-to-insert.

我认为最优雅的方法是使用 PowerShell -f 格式运算符，如下所示:

The most elegant way to do that I think is by making use of the PowerShell -f format operator like this:

# the template strings
$complicatedString1 = "This is a complicated {0}"
$complicatedString2 = "{0} too"

# use the template strings to return new strings
$string1 = $complicatedString1 -f "Test"                # --> "This is a complicated Test"
$string2 = $complicatedString2 -f $string1              # --> "This is a complicated Test too"

$string1 = $complicatedString1 -f "question"            # --> "This is a complicated question"
$string2 = $complicatedString2 -f $string1              # --> "This is a complicated question too"

如果您愿意，也可以使用字符串 object 本身的 Format 方法:

You can also use the Format method of the string object itself if you like:

$string1 = [string]::Format($complicatedString1, "Test")
$string2 = [string]::Format($complicatedString2, $string1)

这会给你完全相同的结果

which will give you the exact same results

• PowerShell -f 运算符
• String.Format

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