删除powershell脚本中的某些文件

Question

I have a powershell script that goes through a directory and deletes files that are older than 18 months. Most of the files follow the following naming convention:

20140628

However, some of the files do not. I am trying to make the script ignore these files and just delete the files that follow the naming convention. For some reason, though, the script below is doing the exact opposite of that and deleting the files that do not follow the naming convention and leaving the ones that do. How would I modify the script to fit my needs? Any help would be greatly appreciated.

$targetdirectory = "\\DPR320-W12-1600\PRTG"
$CleanupList = Get-ChildItem $targetdirectory\test
$Threshold = (get-date).AddMonths(-18)
$culture = [Globalization.CultureInfo]::InvariantCulture

foreach ($DirName in $CleanupList)
{
try {
  [datetime]::ParseExact($DirName.BaseName, 'yyyyMMdd', $culture)
  Remove-Item $DirName.FullName -Force -Recurse
} 

catch {

  continue
}

}

Answer 1

$targetDirectory = "\\DPR320-W12-1600\PRTG"
$cleanupList = Get-ChildItem $(Join-Path $targetdirectory "test")
$threshold = (Get-Date).AddMonths(-18)
$culture = [Globalization.CultureInfo]::InvariantCulture

foreach ($dirName in $cleanupList) {
    try {
        $dateFromName = [datetime]::ParseExact($dirName.BaseName, "yyyyMMdd", $culture)

        if($dateFromName -le $threshold) {
            Remove-Item $dirName.FullName -Force -Recurse
        }
    } catch {
        Continue
    }
}

If parsing as a date fails, an error will be thrown and file will not be deleted.

I'm not even sure Continue is needed here, but you cannot remove the catch block.