Public/Discovery/Compare-List.ps1
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function Compare-List { param ( [Parameter(Mandatory = $true)] [System.IO.FileInfo] $Csv1, [Parameter(Mandatory = $true)] [System.IO.FileInfo] $Csv2 ) $dataSet1 = @{} Import-Csv $Csv1 | ForEach-Object { $dataSet1.Add($_.PrimarySmtpAddress, $_) } $noSmtpFound = [System.Collections.Generic.HashSet[string]]::new() Import-Csv $Csv2 | ForEach-Object { if (-not $dataSet1.Contains($_.PrimarySmtpAddress)) { [void]$noSmtpFound.Add($_.PrimarySmtpAddress) } } $noSmtpFound } # This needs to use to hashsets instead |