PowerShell/GetEnumerator [英] PowerShell/GetEnumerator

问题描述

我有一个简单的问题:

为什么下面的程序不能写入整个数组 $ lines ?它永远循环.我真的很困惑.

Why the program below does not write the whole array $lines? It is looping forever. I am really confused..

function Get-Current ($enumerator) {
    $line = $enumerator.Current
    return $line
}

$lines = @('a', 'b', 'c')
$enumerator = $lines.GetEnumerator()
$enumerator.Reset()

while ($enumerator.MoveNext()) {
    $line = Get-Current $enumerator
    "$line"     
}

推荐答案

似乎表达式:

$enumerator

展开整个枚举数.例如:

unwinds the entire enumerator. For e.g.:

PS C:\> $lines = @('a', 'b', 'c')
PS C:\> $enumerator = $lines.GetEnumerator()
PS C:\> $enumerator.Reset()
PS C:\> $enumerator
a
b
c

因此，当您尝试将表达式传递给函数时，它将变为无效.我能想到的唯一解决方法是像这样将其作为PSObject传递:

So, when you try to pass your expression to the function, it is rendered invalid. The only workaround I can think of is to pass it as a PSObject like so:

function Get-Current ($val) {
    $val.Value.Current
}

$lines = @('a', 'b', 'c')
$enumerator = $lines.GetEnumerator()
$enumerator.Reset()

while ($enumerator.MoveNext()) {
    $line = Get-Current $(get-variable -name enumerator)
    $line
}

这篇关于PowerShell/GetEnumerator的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！