Question

这是我的PowerShell脚本：

$dir = ([io.fileinfo]$MyInvocation.MyCommand.Definition).DirectoryName

Get-ChildItem -Path .\ -Filter *.png -Recurse -File | Where-Object {$_.Name -match ".+[\]]+.png"} | ForEach-Object {
    echo $_.FullName $(Test-Path $_.FullName)
    Remove-Item $_
    echo $_.FullName $(Test-Path $_.FullName)
}

echos提供实际的文件名，但Test-Path解析为False，并且不会删除任何内容。

Answer 1

Because your paths contain ] which is interpreted by the -Path parameter (which you're using implicitly) as part of a pattern.

您应该使用-LiteralPath参数：

$dir = ([io.fileinfo]$MyInvocation.MyCommand.Definition).DirectoryName

Get-ChildItem -Path .\ -Filter *.png -Recurse -File | Where-Object {$_.Name -match ".+[\]]+.png"} | ForEach-Object {
    echo $_.FullName $(Test-Path -LiteralPath $_.FullName)
    Remove-Item -LiteralPath $_
    echo $_.FullName $(Test-Path -LiteralPath $_.FullName)
}

请注意，如果您改为从Get-ChildItem传送原始对象，它将自动绑定到-LiteralPath ，这是需要考虑的事项：

$dir = ([io.fileinfo]$MyInvocation.MyCommand.Definition).DirectoryName

Get-ChildItem -Path .\ -Filter *.png -Recurse -File | Where-Object {$_.Name -match ".+[\]]+.png"} | ForEach-Object {
    echo $_.FullName $($_ | Test-Path)
    $_ | Remove-Item
    echo $_.FullName $($_ | Test-Path)
}

证明这一点：

$dir = ([io.fileinfo]$MyInvocation.MyCommand.Definition).DirectoryName

$fileSample = Get-ChildItem -Path .\ -Filter *.png -Recurse -File | 
    Where-Object {$_.Name -match ".+[\]]+.png"} | 
    Select-Object -First 1


Trace-Command -Name ParameterBinding -Expression { 
    $fileSample.FullName | Test-Path 
} -PSHost  # $fileSample.FullName is a string, still binds to Path

Trace-Command -Name ParameterBinding -Expression { 
    $fileSample | Test-Path 
} -PSHost  # binds to LiteralPath

删除项目不删除文件

1 个答案: