Powershell 测量对象导致ForEach对象循环内的变量不正确

在下面的代码中，我得到了运行时循环中$oldest.Minimum的结果“Microsoft.PowerShell.Commands.GenericObjectMeasureInfo.Minimum”

$oldest=（获取ChildItem-路径“$|”-名称|度量对象-最小值）

循环后，$oldest.Minimum返回循环中最后一个对象的正确值。 此外，如果我只运行

getchilditem-Path“$|”-Name | measureobject-Minimum

，我将在循环中获得正确的输出

任何帮助都将不胜感激

守则：

$folders= @()
Get-Content -Path .\folders.txt | ForEach-Object{
echo "path is $_"
$oldest = (Get-ChildItem -Path "$_" -Name | Measure-Object -Minimum)
echo "oldest folder is $oldest.Minimum"
$folders += "$_\$oldest.Minimum"
}
echo $oldest.Minimum
$minMin =($folders | Measure-Object -Minimum)
echo $minMin.Minimum

结果是：

path is C:\Local Files\Script testing\Dates\1
oldest folder is Microsoft.PowerShell.Commands.GenericObjectMeasureInfo.Minimum
path is C:\Local Files\Script testing\Dates\2
oldest folder is Microsoft.PowerShell.Commands.GenericObjectMeasureInfo.Minimum
path is C:\Local Files\Script testing\Dates\3
oldest folder is Microsoft.PowerShell.Commands.GenericObjectMeasureInfo.Minimum
2019-12-10
C:\Local Files\Script testing\Dates\1\Microsoft.PowerShell.Commands.GenericObjectMeasureInfo.Minimum

在循环中使用

Get ChildItem-Path“$|”-Name | Measure Object-Minimum

，而不是存储到变量

path is C:\Local Files\Script testing\Dates\1


Count    : 5
Average  :
Sum      :
Maximum  :
Minimum  : 2019-12-18
Property :

oldest folder is Microsoft.PowerShell.Commands.GenericObjectMeasureInfo.Minimum
path is C:\Local Files\Script testing\Dates\2
Count    : 5
Average  :
Sum      :
Maximum  :
Minimum  : 2019-12-18
Property :

oldest folder is Microsoft.PowerShell.Commands.GenericObjectMeasureInfo.Minimum
path is C:\Local Files\Script testing\Dates\3
Count    : 5
Average  :
Sum      :
Maximum  :
Minimum  : 2019-12-10
Property :

预期产出：

path is C:\Local Files\Script testing\Dates\1
oldest folder is 2019-12-18
path is C:\Local Files\Script testing\Dates\2
oldest folder is 2019-12-18
path is C:\Local Files\Script testing\Dates\3
oldest folder is 2019-12-10
2019-12-10
C:\Local Files\Script testing\Dates\1\2019-12-10

---

在foreach循环中，当您回显“最早的文件夹是

$variable.property

”语句时，您正在打印

$variable

，但不打印

属性。这是因为
.property
被认为是字符串的一部分

如果需要打印带引号字符串中变量的属性，则必须使用$（）将其覆盖，使其成为需要计算的参数。这样就解决了问题

Get-Content -Path .\folders.txt | ForEach-Object{
  echo "path is $_"
  $oldest = (Get-ChildItem -Path "$_" -Name | Measure-Object -Minimum)
  echo "oldest folder is $($oldest.Minimum)"
  $folders += "$_\$($oldest.Minimum)"
}

谢谢，这正是我需要的。