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In short, how to convert this

$al = New-Object System.Collections.ArrayList

$al+=[PSCustomObject]@{prop1="value1"; prop2="value2"}
$al+=[PSCustomObject]@{prop1="value11"; prop3="value33"}
$al+=[PSCustomObject]@{prop4="value444"}

Into this

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1 Answer 1

Reset to default
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Use the psobject hidden memberset to discover all the property names before exporting:

$propertyNames = $al |ForEach-Object {
  # Discover all the object's properties
  $_.psobject.Properties |ForEach-Object {
    # Get each property name
    $_.Name
  }
} |Sort-Object -Unique

# Now the CSV will have a column for every single unique property name
$al |Select-Object $propertyNames |Export-Csv -Path $Path1 -NoTypeInformation
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