将for循环的变量插入另一个变量名 [英] Inserting for loop's variable into another variable names

问题描述

我正在尝试简化同事使用的Windows接口脚本，在该脚本中他使用了很多if循环，我认为可以使用for循环进一步缩短这些循环.

I'm trying to simplify a Windows interface script that my colleague did in which he used a lot of if-loops which I think can be further shortened using for-loops.

基本上，我们有几台计算机，每台计算机的范围为4-12，我们为每个管理员提供一个界面来还原其各自的快照.

Basically we have a couple sets of computers that ranged from 4 - 12 per set & we provide each admin an interface to revert their respective snapshots.

我正在用for循环中的$ i值替换每个变量中的数字.

I'm looking to replace the number in each variable with the $i value from the for-loop.

我尝试使用数组&哈希表，但根据我收集的数据，它们更适合存储值&而不是包含其他变量的公式.

I've tried using arrays & hashtables but based on what I've gathered, they're much more suitable in storing values & not formulas that included other variables.

if($ComputerNumber -eq 4) {
   $checkBoxComputer1LocX = $leftMargin
   $checkBoxComputer1LocY = [int]$labelSubHeaderLocY + [int]$buttonHeight + [int]$padding

   $checkBoxComputer2LocX = $leftMargin
   $checkBoxComputer2LocY = [int]$labelSubHeaderLocY + [int]$buttonHeight + [int]$padding + (1 * ([int]$checkBoxHeight + [int]$padding))

   $checkBoxComputer3LocX = $leftMargin
   $checkBoxComputer3LocY = [int]$labelSubHeaderLocY + [int]$buttonHeight + [int]$padding + (2 * ([int]$checkBoxHeight + [int]$padding))

   $checkBoxComputer4LocX = $leftMargin
   $checkBoxComputer4LocY = [int]$labelSubHeaderLocY + [int]$buttonHeight + [int]$padding + (3 * ([int]$checkBoxHeight + [int]$padding))
}

这是我要实现的目标:

for($i=1; $i -le $ComputerNumber; i++) {
   $checkBoxComputer$iLocX = $leftMargin
   $checkBOxComputer$iLocY = [int]$labelSubHeaderLocY + [int]$buttonHeight + [int]$padding + (($i - 0) * ([int]$checkBoxHeight + [int]padding))
}

推荐答案

使用变量间接寻址(通过存储在另一个变量中的名称来引用变量)进行赋值 ，使用Set-Variable (对于检索，您将使用Get-Variable):

To use variable indirection (referring to a variable via its name stored in another variable) for assignment, use Set-Variable (for retrieval, you'd use Get-Variable):

for($i=1; $i -le $ComputerNumber; i++) {
  Set-Variable -Name checkBoxComputer${i}LocX -Value $leftMargin
  Set-Variable -Name checkBoxComputer${i}LocY -Value ([int]$labelSubHeaderLocY + [int]$buttonHeight + [int]$padding + (($i - 0) * ([int]$checkBoxHeight + [int]padding)))
}

请注意，变量$i的名称是如何用{...}(${i})括起来的，以便清楚地对其进行描述，从而不会将后续字符视为名称的一部分.

Note how the name of variable $i is enclosed in {...} (${i}) in order to unambiguously delineate it, so that the subsequent characters aren't considered part of the name.

但是，您绝对可以使用 arrays 和自定义对象代替单个变量，这是更可取的:

However, you can definitely use arrays and custom objects instead of individual variables, which is preferable:

[array] $checkBoxes = for($i=1; $i -le $ComputerNumber; i++) {
  [pscustomobject] @{ 
     LocX = $leftMargin
     LocY= [int]$labelSubHeaderLocY + [int]$buttonHeight + [int]$padding + (($i - 0) * ([int]$checkBoxHeight + [int]padding))
  }
}

上面的代码创建了一个(基于0-索引的)自定义对象数组，每个对象都有一个.LocX和.LocY属性，因此，例如，您可以访问第一个复选框的.LocX值，如下所示:如下:

The above creates a (0-index-based) array of custom objects that each have a .LocX and .LocY property, so that, for instance, you can access the first checkbox's .LocX value as follows:

$checkBoxes[0].LocX

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