我在验证脚本中的文件输入时遇到一些问题。使用以下函数

Function pathtest {
    [CmdletBinding()]
    param (
        [ValidateScript({
                if (-Not ($_ | Test-Path -PathType Leaf) ) {
                    throw "The Path argument must be a file. Folder paths are not allowed."
                }
                return $true
            })]
        [System.IO.FileInfo]$Path
    )

    Write-Host ("Output file: {0}" -f $Path.FullName)
}

然后用这两个输入文件调用函数

pathtest -Path c:\temp\test.txt
pathtest -Path c:\temp\test.csv

第一个命令（test.txt）返回路径，但第二个命令（test.csv）返回错误：

PS C:\> pathtest c:\it\test.txt
Output file: c:\it\test.txt
PS C:\> pathtest c:\it\test.csv
pathtest : Cannot validate argument on parameter 'Path'. The Path argument must be a file. Folder paths are not
allowed.
At line:1 char:10
+ pathtest c:\it\test.csv
+          ~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidData: (:) [pathtest], ParameterBindingValidationException
    + FullyQualifiedErrorId : ParameterArgumentValidationError,pathtest

型
知道这是怎么回事吗？