powershell - 在PowerShell脚本中测试路径的位置

Question

我有一个脚本，当文件即将达到其最大大小时会发送电子邮件。

问题是，当在给定路径下找不到文件时，我无法对脚本应执行的操作进行验证检查。

我知道我应该实现:

if(!(Test-Path $item.Path))
{
   "The file " + $item.Name + " is not found! <br />" 
}

但是我不知道将其准确放置在哪里(因为到处都是错误)。

代码:

我首先从配置文件中检索文件:

$list = foreach ($file in $files)
{   
    $f = Get-Item $file.Path
    New-Object -Type PSObject -Property @{

    Name = $f.Name
    Path = $file.Path
    Size = ($f.Length/$byteSize)
    }
}

然后我遍历文件列表并检查它们的大小:

foreach ($item in $list)
{
    if($item.Size -gt $item.TriggerSize -And (Test-Path $item.Path))
    {
        #Write-Host $item.Name "Warning! File has reached it's max limit ("$item.Size.ToString(".00")"), The max size is" $item.MaxSize". The trigger size is: " $item.TriggerSize "`r`n"

        $body +=

        "The file " + $item.Name + " is reaching his max size! 
        <br /> Current size: <b>"+$item.Size.ToString(".00") + " " + $byteSize.Substring(1) + "</b>"  + 
        "<br /> Maximum size: " + $item.MaxSize + " " + $byteSize.Substring(1) + "<br /><br />"
    }
}

我尝试在以下位置执行错误检查:

$list = foreach ($file in $files)
{   

  if(!(Test-Path $item.Path))
        {
           "The file " + $item.Name + " is not found! <br />" 
        }

    $f = Get-Item $file.Path
    New-Object -Type PSObject -Property @{

    Name = $f.Name
    Path = $file.Path
    Size = ($f.Length/$byteSize)
    }
}

和这里

foreach ($item in $list)
{
    if($item.Size -gt $item.TriggerSize -And (Test-Path $item.Path))
    {
        #Write-Host $item.Name "Warning! File has reached it's max limit ("$item.Size.ToString(".00")"), The max size is" $item.MaxSize". The trigger size is: " $item.TriggerSize "`r`n"

        $body +=

        "The file " + $item.Name + " is reaching his max size! 
        <br /> Current size: <b>"+$item.Size.ToString(".00") + " " + $byteSize.Substring(1) + "</b>"  + 
        "<br /> Maximum size: " + $item.MaxSize + " " + $byteSize.Substring(1) + "<br /><br />"
    }

  if(!(Test-Path $item.Path))
    {
       "The file " + $item.Name + " is not found! <br />" 
    }
}

但是我不断收到错误消息，它是在 Get-Item上找不到文件:

我故意使用错误路径编写的文件的名称:
file123.exe

错误(在 if(!(Test-Path $file.path))行:

Get-Item : Cannot find path 'file123.exe' because it does not exist.

Answer 1

您正在尝试错误处理，但是您的代码仍然将控制权传递给了主逻辑。相反，您应该开发控制流，以便仅当Get-Item返回true时才调用Test-Path。

$list = foreach ($file in $files)
{   
  if (Test-Path $file.Path) {

    $f = Get-Item $file.Path
    New-Object -Type PSObject -Property @{

      Name = $f.Name
      Path = $f.Path
      Size = ($f.Length/$byteSize)
    }
  } else {
    "The file " + $file.path + " is not found! <br />" 
  }
}

最后， 证明您的代码!您已经测试了 $item.path，但是可以访问 $file.path。给定您的foreach循环，两个地方都应该有 $file.path。