Book-PowerShell-Samples

0.2

Chapter4/4.6_AdvancedFunctions/4.6.6_Validattion/ValidateNotNullOrEmpty.ps1

                                function Get-DirectorySize {

    [CmdletBinding()]

    param(

      [parameter(Mandatory = $true, ValueFromPipeline = $true, ValueFromPipelineByPropertyName = $true)]

      [Alias("Path", "PSPath")]

      [ValidateNotNullOrEmpty()]

      [string[]]$LiteralPath,

      [parameter(ValueFromPipelineByPropertyName = $true)]

      [int]$OverSize

    )

  }