如何将目录对象转换为字符串-Powershell

Question

我有一个从一些注册表查询中检索到的路径数组。到目前为止，它们仍作为目录对象返回，但我需要将它们转换为字符串数组。在PS中，最有效的方法是什么？

代码：

$found_paths = @();
$uninstall_keys = getRegistrySubkeys "HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsCurrentVersionUninstall" '\Office[d+.*]';
if ($uninstall_keys -ne $null) 
{
foreach ($key in $uninstall_keys)
{
$product_name = getRegistryValue $key "DisplayName";
$version = getRegistryValue $key "DisplayVersion";
$base_install_path = getRegistryValue $key "InstallLocation"; 
$full_install_path = Get-ChildItem -Directory -LiteralPath $base_install_path | Where-Object Name -match '^Officed{1,2}D?' | Select-Object FullName;
$found_paths += ,$full_install_path
}
}
write-output $found_paths; 

输出：

FullName                                          
--------                                          
C:Program FilesMicrosoft Office ServersOFFICE15
C:Program FilesMicrosoft OfficeOffice15        

期望输出：

C:Program FilesMicrosoft Office ServersOFFICE15
C:Program FilesMicrosoft OfficeOffice15  

Answer 1

最有效的方法是使用成员访问枚举((...).PropName(：

$full_install_path = (
Get-ChildItem -Directory -LiteralPath $base_install_path | Where-Object Name -match '^Officed{1,2}D?'
).FullName

注意：听起来您的命令可能只返回了一个目录信息对象，但这种方法也适用于多个组。

需要处理的对象越多，与Select-Object-ExpandProperty解决方案相比，成员访问枚举的速度优势就越大(见下文(。

---

至于您尝试了什么：

... | Select-Object FullName

不返回输入对象的.FullName属性的值，而是返回具有包含该值的.FullName属性的[pscustomobject]实例。要仅获取值，您需要使用... | Select-Object -ExpandProperty FullName

$found_paths += , $full_install_path

您的意思可能是$found_paths += $full_install_path-不需要首先在RHS上构造数组(使用,(。

事实上，如果这样做，并且$full_install_path恰好包含多个元素，则会得到嵌套的数组。

后退一步：让PowerShell自动为您收集数组中循环语句的输出要高效得多：

$uninstall_keys = getRegistrySubkeys "HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsCurrentVersionUninstall" '\Office[d+.*]'
if ($null -ne $uninstall_keys) 
{
# Collect the `foreach` loop's outputs in an array.
[array] $found_paths = foreach ($key in $uninstall_keys)
{
$product_name = getRegistryValue $key "DisplayName"
$version = getRegistryValue $key "DisplayVersion"
$base_install_path = getRegistryValue $key "InstallLocation"
# Get and output the full path.
(Get-ChildItem -Directory -LiteralPath $base_install_path | Where-Object Name -match '^Officed{1,2}D?').FullName
}
}
$found_paths # output (implicit equivalent of Write-Output $found_paths