在 PowerShell 循环中获取当前项目的索引 [英] Get index of current item in a PowerShell loop

问题描述

给定 PowerShell 中的项目列表，如何从循环中找到当前项目的索引?

Given a list of items in PowerShell, how do I find the index of the current item from within a loop?

例如:

$letters = { 'A', 'B', 'C' }

$letters | % {
  # Can I easily get the index of $_ here?
}

所有这一切的目标是我想使用 Format-Table 并添加一个带有当前项索引的初始列.通过这种方式，人们可以交互地选择要选择的项目.

The goal of all of this is that I want to output a collection using Format-Table and add an initial column with the index of the current item. This way people can interactively choose an item to select.

推荐答案

我不确定自动"变量是否可行.你总是可以为自己声明一个并增加它:

I am not sure it's possible with an "automatic" variable. You can always declare one for yourself and increment it:

$letters = { 'A', 'B', 'C' }
$letters | % {$counter = 0}{...;$counter++}

或者使用 for 循环代替...

Or use a for loop instead...

for ($counter=0; $counter -lt $letters.Length; $counter++){...}

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