将参数传递给要用于Test-Path -include选项的powershell脚本吗？

Question

这是我第一次问一个问题，请耐心等待。 我通过编写一些基本的维护脚本来自学Powershell。 我的问题是关于我正在编写的清理脚本，该脚本接受用于确定目标目录和要删除文件的参数。

问题：

该脚本接受用于文件扩展名列表的可选参数，以在处理文件删除时查找。 我试图在实际运行删除之前测试文件是否存在。 我将test-path与–include参数一起使用，以在ValidateScript块中运行检查。 如果我传递单个文件扩展名或不传递任何文件扩展名，它都可以工作，但是当我尝试传递多个文件扩展名时，它将失败。

我已经尝试在脚本中的代码上使用以下变体：

[ValidateScript({ Test-Path $targetDirChk  -include $_ })]

[ValidateScript({ Test-Path $targetDirChk  -include "$_" })]

[ValidateScript({ Test-Path $targetDirChk  -include ‘$_’ })]

对于以上每种可能性，我都使用以下多种扩展名文件列表的变种从命令行运行了脚本：

& G:\batch\DeleteFilesByDate.ps1 30 G:\log  *.log,*.ext

& G:\batch\DeleteFilesByDate.ps1 30 G:\log  “*.log, *.ext”

& G:\batch\DeleteFilesByDate.ps1 30 G:\log  ‘*.log, *.ext’

错误消息的示例：

chkParams : Cannot validate argument on parameter 'includeList'. The " Test-Path $targetDirChk -include "$_" " validation script for the argument with value "*.log, *.ext" did not return true. Determine why the validation script failed and then try the command again.
At G:\batch\DeleteFilesByDate.ps1:81 char:10
+ chkParams <<<<  @args
    + CategoryInfo          : InvalidData: (:) [chkParams], ParameterBindingValidationException
    + FullyQualifiedErrorId : ParameterArgumentValidationError,chkParams

完整脚本如下。 我尚未添加实际的代码来删除文件，因为我仍在努力接受和验证传入的参数。

我已经搜索了google和stackoverflow，但没有找到解决此特定问题的方法。 我假设我在代码中做错了什么，或者有一种更好的方法来完成我想做的事情。

注意：我应该提到，我也尝试过在脚本外部运行带有多个文件扩展名的test-path，没有问题：

PS G:\batch\powershell> test-path G:\log\* -include *.log

True

PS G:\batch\powershell> test-path G:\log\* -include *.log, *.ext

True

脚本：

# Check that the proper number of arguments have been supplied and if not provide usage statement.
# The first two arguments are required and the third is optional.
if ($args.Length -lt 2 -or $args.Length -gt 3 ){
    #Get the name of the script currently executing.
    $ScriptName = $MyInvocation.MyCommand.Name
    $ScriptInstruction = @"

    usage: $ScriptName <Number of Days> <Directory> [File Extensions]

    This script deletes files from a given directory based on the file date.

    Required Paramaters:

    <Number of Days>:   
    This is an integer representing the number of days worth of files 
    that should be kept. Anything older than <Number of Days> will be deleted.

    <Directory>:        
    This is the full path to the target folder.

    Optional Paramaters:

    [File Extensions]   
    This is the set of file extensions that will be targeted for processing. 
    If nothing is passed all files will be processed.
"@  
    write-output $ScriptInstruction
    break
}
#Function to validate arguments passed in.
function chkParams()
{
    Param(
    [Parameter(Mandatory=$true,
        HelpMessage="Enter a valid number of days between 1 and 999")]

    #Ensure the value passed is between 1 and 999.
    #[ValidatePattern({^[1-9][0-9]{0,2}$})]
    [ValidateRange(1,999)]
    [Int]
    $numberOfDays,

    [Parameter(Mandatory=$true,
        HelpMessage="Enter a valid target directory.")]
    #Check that the target directory exists.
    [ValidateScript({Test-Path $_ -PathType 'Container'})] 
    [String]
    $targetDirectory,   

    [Parameter(Mandatory=$false,
        HelpMessage="Enter the list of file extensions.")]  
    #If the parameter is passed, check that files with the passed extension(s) exist.   
    [ValidateScript({ Test-Path $targetDirChk -include "$_" })]
    [String]
    $includeList
    )
    #If no extensions are passed check to see if any files exist in the directory.
    if (! $includeList ){
        $testResult = Test-path $targetDirChk
        if (! $testResult ){
            write-output "No files found in $targetDirectory"
            exit
        }
    } 
}
#
if ($args[1].EndsWith('\')){
    $targetDirChk = $args[1] + '*'
} else {
    $targetDirChk = $args[1] + '\*'
}       
chkParams @args

Answer 1

-Include Test-Path上的-Include是一个string[] 。 您可能想镜像该定义：

[ValidateScript({ Test-Path $targetDirChk -include $_ })]
[String[]]
$includeList

并在其中放置"" ，因为它们将强制参数为字符串，从而尝试匹配看起来像`foo.log blah.ext的文件。

您还必须在调用函数时在该参数周围加上括号或删除空格。