这是我第一次提出问题，所以请多多包涵。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，它接受参数来确定要删除的目标目录和文件。
问题：
该脚本接受一个可选参数，用于处理文件删除时要查找的文件扩展名列表。我正在尝试在实际运行删除之前测试文件是否存在。我使用带有 –include 参数的 test-path 在 ValidateScript 块中运行检查。如果我传入一个文件扩展名或没有文件扩展名，它会起作用，但是当我尝试传入多个文件扩展名时，它会失败。
我尝试在脚本内的代码上使用以下变体：
[ValidateScript({ Test-Path $targetDirChk -include $_ })]
[ValidateScript({ Test-Path $targetDirChk -include "$_" })]
[ValidateScript({ Test-Path $targetDirChk -include ‘$_’ })]
对于上述每种可能性，我已经使用以下变体从命令行运行了多扩展名文件列表的脚本：
& 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’
错误信息示例：
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
完整的脚本如下。我还没有添加删除文件的实际代码，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，但我还没有找到解决这个特定问题的方法。我假设我的代码有问题，或者有更好的方法来完成我想做的事情。
注意：我应该提到，我还尝试在脚本之外运行具有多个文件扩展名的测试路径，没有任何问题：
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