PowerShell将数组赋值给变量时丢失换行符的解决方法

编写的PowerShell代码意图通过注释$PreReqFailx变量来动态展示对应问题列表，但将数组$Issues拼接至$PreReqFails变量后，所有问题被合并为一行，无法保留原数组的换行格式。

原代码问题点 #

直接将数组与字符串拼接时，PowerShell会默认使用空格作为分隔符连接数组元素，导致所有问题内容挤在一行。

修改方案 #

使用-join操作符，显式指定用换行符（rn）连接数组中的每个元素，替换原拼接逻辑：

修改后的完整代码 #

$PreReqFail1 = "- Your computer is not in the office"
$PreReqFail2 = "- Your computer does not have its power cable plugged in"
$PreReqFail3 = "- Your computer does not have a network cable plugged in"

# 简化判断逻辑：检查是否存在非空的前置条件失败项
$PreReqFail = @($PreReqFail1, $PreReqFail2, $PreReqFail3) | Where-Object { -not [string]::IsNullOrEmpty($_) }
if ($PreReqFail) {
    $Issues = $PreReqFail  # 直接复用过滤后的非空元素数组
    $Issues
    # 用换行符连接数组元素后再拼接
    $PreReqFails = "The following conditions have not been met:`r`n`r`n" + ($Issues -join "`r`n")
    $PreReqFails
}

# 清理变量
$Issues = $null
$PreReqFail = $null
$PreReqFail1 = $null
$PreReqFail2 = $null
$PreReqFail3 = $null
$PreReqFails = $null

关键修改说明 #

原代码中$PreReqFails = "The following conditions have not been met:rnrn" + $Issues改为：

$PreReqFails = "The following conditions have not been met:`r`n`r`n" + ($Issues -join "`r`n")

通过$Issues -join "rn"将数组中的每个元素用换行符连接成单个字符串，确保每个问题单独占一行。

优化说明 #

同时简化了$PreReqFail的判断逻辑：通过过滤数组中的非空元素，直接判断是否存在需要展示的问题，避免重复的if判断。

预期输出 #

The following conditions have not been met:

- Your computer is not in the office
- Your computer does not have its power cable plugged in
- Your computer does not have a network cable plugged in

内容的提问来源于stack exchange，提问作者JAG