PowerShell 中的嵌套 ForEach() [英] Nested ForEach() in PowerShell

问题描述

我在 Powershell 中遇到嵌套 ForEach 循环的一些问题.首先，我需要遍历列表 1.对于列表 1 中的每个对象，我需要遍历列表 2.当我在列表 2 中找到相似的对象时，我想转到列表 1 中的下一个对象.

I'm having some troubles with nested ForEach loops in Powershell. First, I need to iterate through list 1. For every object in list 1, I need to iterate through list 2. When I found the resembling object in list 2, I want to go to the next object in list 1.

我试过中断，我试过继续，但它对我不起作用.

I've tried break, i've tried continue, but it won't work for me.

Function checkLists() {
  ForEach ($objectA in $listA) {
    ForEach ($objectB in $listB) {
       if ($objectA -eq $objectB) {
           // Do something 
           // goto next object in list A and find the next equal object
       }
    }
  }
}

a) PowerShell 中的 break/continue 究竟有什么作用?

a) What does a break/continue exactly do in PowerShell?

b) 我应该如何解决我的问题"?

b) How exaclty should I conquer my 'problem'?

推荐答案

使用 get-help about_break 中描述的标签:

Use a label as described in get-help about_break:

A Break statement can include a label. If you use the Break keyword with
a label, Windows PowerShell exits the labeled loop instead of exiting the
current loop

就这样，

foreach ($objectA in @("a", "e", "i")) {
    "objectA: $objectA"
    :outer
    foreach ($objectB in @("a", "b", "c", "d", "e")) {
       if ($objectB -eq $objectA) {
           "hit! $objectB"
           break :outer
       } else { "miss! $objectB" }
    }
}

#Output:
objectA: a
hit! a
objectA: e
miss! a
miss! b
miss! c
miss! d
hit! e
objectA: i
miss! a
miss! b
miss! c
miss! d
miss! e

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