Public/Discovery/Compare-List.ps1
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function Compare-List { param ( [Parameter(Mandatory)] [ValidateNotNull()] [System.IO.FileInfo] $ReferenceCsv, [Parameter(Mandatory)] [ValidateNotNull()] [System.IO.FileInfo] $DifferenceCsv, [Parameter()] [string] $FindInColumn = "UserPrincipalName" ) $dataSet1 = @{} Import-Csv $ReferenceCsv | ForEach-Object { $dataSet1.Add($_.$FindInColumn, $_) } $notFound = [System.Collections.Generic.HashSet[string]]::new() Import-Csv $DifferenceCsv | ForEach-Object { if (-not $dataSet1.Contains($_.$FindInColumn)) { [void]$notFound.Add($_.$FindInColumn) } } $notFound } # This needs to use to hashsets instead and you are doing nothing with the values of hashtable |