Powershell 错误处理和日志记录

Question

我有以下 powershell 脚本，它循环浏览文件列表并重命名它们。我想介绍一些错误处理，但不知道从哪里开始。

[System.Reflection.Assembly]::LoadWithPartialName("Microsoft.SharePoint")

$Url = "https://....."
$UrlSub = "docs"
$FullPath = $Url + $UrlSub
$destinationFolder = "c:\022713\"
$sourceCsv = "c:\filename.CSV"

$Site = New-Object -TypeName Microsoft.SharePoint.SPSite $Url 
$web =  $Site.OpenWeb($UrlSub)
$fileObjects = Import-CSV $sourceCsv 

ForEach ($fileObject in $fileObjects) 
{
    $fileUrl = $fileObject.DOC_FILENAME.replace($Url,"")
    $file = $web.GetFile($FullPath)
        $binary = $file.OpenBinary()

    $dateTimeStamp = Get-Date -format s
    $newFileName = $fileObject.DocumentType + "_" + $fileObject.SAPObjectNumber + "_" + $dateTimeStamp.replace(":","").replace("-","")
    $extension = [System.IO.Path]::GetExtension($file.Name)

    $stream = New-Object System.IO.FileStream(($destinationfolder + $newFileName + $extension), [System.IO.FileMode]::Create)
    $writer = New-Object System.IO.BinaryWriter($stream)
    $writer.write($binary)
    $writer.Close()
}
$web.Dispose()

Answer 1

嗯，你在这里没有给我们太多的工作。您需要找出代码中可能出现的问题并使用 ex 处理这些问题。尝试/捕捉方块或陷阱。

例如。如果您无权创建/覆盖目标文件，您的 filestream 构造函数可能会引发异常。这是UnauthorizedAccessException 异常，定义在MSDN - FileStream Class 所以要处理它，你可以使用这个：

try {
    $stream = New-Object System.IO.FileStream($destinationfolder + $newFileName + $extension), Create
    $writer = New-Object System.IO.BinaryWriter($stream)
    $writer.write($binary)
    $writer.Close()
} catch [UnauthorizedAccessException] {
    #Handle your exception, ex. log it. Exception is stored in variable $_  and includes properties like $_.message
} catch {
    #Catch every possible terminating exception except 'UnauthorizedAccessException'
}

要检查异常的属性，请使用

(new-object UnauthorizedAccessException) | gm

或

(new-object Exception) | gm 

（无论如何，如果不是所有的属性都继承自这个一般的 expcetion，则 90%）

在 SO 或 google 上搜索以了解有关 try/catch 和陷阱的更多信息。