exception - 简单的 Try/catch 不起作用

Question

这是我的代码，非常简单:

$TargetFolder = 'M:\'

try{

$Getfolderlist = Get-ChildItem $TargetFolder -Recurse | ? { $_.PSIsContainer -and $_.Name -eq 'old' }

}catch {

Write-Host "Error ! :) "    

}

它不起作用，我收到一个 powershell 异常:

Get-ChildItem : Cannot find drive. A drive with the name 'M' does not exist.
At C:\ef-scripts\PurgeDeliveryZip\purge_delivery_zip.ps1:23 char:18
+ $Getfolderlist = Get-ChildItem $TargetFolder -Recurse | ? { $_.PSIsContainer -an ...
+                  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (M:String) [Get-ChildItem], DriveNotFoundException
    + FullyQualifiedErrorId : DriveNotFound,Microsoft.PowerShell.Commands.GetChildItemCommand

感谢您的帮助。

Answer 1

您需要将 -ErrorAction 设置为 Stop。这样catch block 就得到了异常。在这里阅读有关 try catch 用法的信息:http://technet.microsoft.com/en-us/library/hh847793.aspx

此外，您可能想阅读有关 PowerShell 和 ErrorAction 中的终止错误的信息。通用参数有帮助。

$TargetFolder = 'M:\'

try{
$Getfolderlist = Get-ChildItem $TargetFolder -Recurse -Ea Stop | ? { $_.PSIsContainer -and $_.Name -eq 'old' }
}
catch {
Write-Host "Error ! :) "    
}