PowerShell – System.Collections.ArrayList – Add versus AddRange


Recently, I converted a small Powershell code from using Array to ArrayList.

Upon the conversion, the Out-Gridview no longer displayed the actual contents of the collection, but the collection’s metadata.



Here is a sample of what is displayed:-

Image -01

Textual -01

  1. Columns
    • Length
    • LongLength
    • Rank
    • IsReadOnly
    • IsFixedSized
    • IsSynchronized
    • Count


Sample Code


    Establishes and enforces coding rules in expressions, scripts, and script blocks.
Set-StrictMode -Version latest

#$arrayNumbered = @();
$arrayNumberedAdd = New-Object -TypeName "System.Collections.ArrayList";

$arrayNumberedAddRange = New-Object -TypeName "System.Collections.ArrayList";

$arrayNumbered1To4 = 1..4
$arrayNumbered13To17 = 13..17

#Add Arrays using Add
$null = $arrayNumberedAdd.Add($arrayNumbered1To4 );
$null = $arrayNumberedAdd.Add($arrayNumbered13To17 );

#Add Arrays using AddRange
$null = $arrayNumberedAddRange.AddRange($arrayNumbered1To4 );
$null = $arrayNumberedAddRange.AddRange($arrayNumbered13To17 );
$arrayNumbered1To4 | Out-Gridview  -wait
$arrayNumbered13To17 | Out-Gridview  -wait

$arrayNumberedAdd | Out-Gridview  -wait

$arrayNumberedAddRange | Out-Gridview  -wait


Output – $arrayNumber1To4

Output – $arrayNumber13To17

Output – $arrayNumberedAdd

Output – $arrayNumberedAddRange



  1. Output – $arrayNumber1To4
    • Raw Data
  2. Output – $arrayNumber13To17
    • Raw Data
  3. Output – $arrayNumberAdd
    • Result of adding using Add
  4. Output – $arrayNumberAddRange
    • Result of adding using AddRange


Source Code



Powershell – Collection – System.Collections.ArrayList – Add Versus AddRange


  1. Microsoft
    • Docs > PowerShell > Scripting > Reference > Microsoft.PowerShell.Utility


If you find that when you employ Out-Grid your data is displayed summarized and not as individual items, please go back and review how you are populating your collections.

That is are you using Add or AddRange?



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