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User mentioned (1): @sirtao&#039;s
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I accept @sirtao's answer.

Meanwhile I was working on .Net in powershell to do this properly

$aoo = New-Object System.Collections.Hashtable[] $idRange.Count
foreach ($i in $idRange) {
    $i = $aoo.IndexOf($uid)
    $aoo[$i] = New-Object System.Collections.Hashtable
}

this way I can add/set/update properties like this for case in my question

foreach ($id in $idRange) {
    $i = $idRange.IndexOf($id)
    $aoo[$i]['id'] = $id
}

or add/set/update just one parameter (for what I need)

$aoo[2]['x'] = 7

79077802