Question

我正在尝试比较使用Get-ChildItem cmdlet获得的两个列表。

我了解了Compare-Object cmdlet，但是在这种情况下，我更喜欢使用foreach，因为它可以访问$file变量。

$StartingFolderPath = "C:\---\StartingFolder"
$EndingFolderPath = "C:\---\EndingFolder"


$AllStartingFiles = Get-ChildItem $StartingFolderPath 
$AllEndingFiles = Get-ChildItem $EndingFolderPath

Write-Host "First folder content:"$AllStartingFiles 
Write-Host "Second folder content:" $AllEndingFiles  


foreach($file in $AllEndingFiles){

    write-Host "Element :" $file.Name

    $result = $AllStartingFiles.Contains($file.Name)
    write-host $result

    if($AllStartingFiles.Contains($file.Name)){
    Write-Host  "You are here"
    Write-Host $file.Name
    }    
}

但是看来我无法传递if控件if($AllStartingFiles.Contains($file.Name))，该控件返回false。

输出

First folder content: 1_one.txt 2_two.txt 3_three.txt 5_five.txt
Second folder content: 1_one.txt 2_two.txt 3_three.txt 4_four.txt 5_five.txt 
6_six.txt
Element : 1_one.txt
False
Element : 2_two.txt
False
Element : 3_three.txt
False
Element : 4_four.txt
False
Element : 5_five.txt
False
Element : 6_six.txt
False

我也尝试过使用-Contains运算符，但没有任何运气。

Answer 1

您在此期间未解决Name属性

$result = $AllStartingFiles.Contains($file.Name)

正确的方法是：

$result = $AllStartingFiles.Name.Contains($file.Name)

即使只是不想使用Compare-Object也是如此，因为您担心会丢失文件属性，而事实并非如此。

Compare-Object -ReferenceObject $AllEndingFiles -DifferenceObject $AllStartingFiles -IncludeEqual -ExcludeDifferent | Select-Object -ExpandProperty InputObject

这将为您提供同时出现在列表和属性中的所有文件。

Answer 2

我不知道不使用比较对象的原因：

> tree /F
├───first
│       1_one.txt
│       2_two.txt
│       3_three.txt
│       5_five.txt
│
└───second
        1_one.txt
        2_two.txt
        3_three.txt
        4_four.txt
        5_five.txt

> compare (gci .\first\) (gci .\second\)

InputObject SideIndicator
----------- -------------
4_four.txt  =>

Powershell比较两个List与foreach

2 个答案: