将文件夹名称添加到数组中的路径

Question

我希望使用 foreach 语句将文件夹名称添加到（相对）路径数组的开头，但它没有对数组进行任何更改（也没有错误）

注意：这更多的是出于教育目的，而不是功能性的，因为我使用我已经注释掉的 for 循环工作，但我有兴趣了解 foreach 语句的工作原理

$myFiles = @(
    "blah1\blah2\file1.txt"
    "blah3\blah4\file2.txt"
    "blah5\blah6\file3.txt"
)

$checkoutFolder = "folder1"

#for ($h = 0; $h -lt $myFiles.Length; $h++) {
#$myFiles[$h] = $checkoutFolder + "\" + $myFiles[$h]
#}

foreach ($path in $myFiles) {
$path = $checkoutFolder + "\" + $path
}

$myFiles

我也试过使用缓冲区变量，例如

$buffer = $checkoutFolder + "\" + $path
$path = $buffer

但结果相同，即输出：

blah1\blah2\file1.txt
blah3\blah4\file2.txt
blah5\blah6\file3.txt

Answer 1

最好开始使用 Join-Path cmdlet，以避免创建省略或加倍反斜杠的路径。

像这样就可以了：

$checkoutFolder = "folder1"
$myFiles = "blah1\blah2\file1.txt", "blah3\blah4\file2.txt", "blah5\blah6\file3.txt" | ForEach-Object {
    Join-Path -Path $checkoutFolder -ChildPath $_
}

$myFiles

输出：

folder1\blah1\blah2\file1.txt
folder1\blah3\blah4\file2.txt
folder1\blah5\blah6\file3.txt

Answer 2

我想到了两个办法：

使用旧数组的修改数据创建新数组

$myFiles = @(
            "blah1\blah2\file1.txt"
            "blah3\blah4\file2.txt"
            "blah5\blah6\file3.txt"
            )
$checkoutFolder = "folder1"

#Create new array $myFilesnew
$myFilesnew = @()
#For each line in in old array
foreach ($file in $myFiles)
{
#Create new row from modied row $file of $myFiles array
$row = $checkoutFolder+"\"+$file
#Add row $row to a new array $myFilesnew
$myFilesnew+=$row
}

$myFilesnew

修改现有数组的每一行：

$myFiles = @(
            "blah1\blah2\file1.txt"
            "blah3\blah4\file2.txt"
            "blah5\blah6\file3.txt"
            )
$checkoutFolder = "folder1"

$i=0
while($i-lt $myFiles.Count)
    {
     #Get $i row $myFiles[$i] from aray, perform insert of modified data, write data back to $myFiles[$i] row of the array
     $myfiles[$i]=$myFiles[$i].Insert(0,$checkoutFolder+"\");
     #Add +1 to $i
     $i++

        }
$myFiles

Answer 3

您可以将每个字符串的正则表达式开头替换为文件夹名称。这也是生成计算机名的有用习惯用法。

'blah1\blah2\file1.txt','blah3\blah4\file2.txt','blah5\blah6\file3.txt' -replace '^','folder1\'

folder1\blah1\blah2\file1.txt
folder1\blah3\blah4\file2.txt
folder1\blah5\blah6\file3.txt

将文件夹名称添加到数组中的路径

Prepend folder name to paths in an array

windows

powershell

filenames

string-concatenation

prepend