Hashtable with multiple values in GridView - powershell

Question

I am storing data in a hashtable with multiple values like this:
$hash = #{}
$folders = dir (...) | where (...)
foreach ($folder in $folders) {
$num1 = (...)
$num2 = (...)
$hash.Add($folder.Name,#($num1,$num2))
}
So this is a hash with an array in its value part. The array always got two items. When finished the foreach part I want to show the data with Out-GridView like this:
$hash | select -Property #{Expression={$_.Name};Label="FolderName"},
#{Expression={$_.Name[0]};Label="num1"},
#{Expression={$_.Name[1]};Label="num2"} | Out-GridView
But as you can imagine, this is not working. How can I split the stored array in the value part of my hash into two new columns to show them in overall three columns in the GridView?
Should be something like Name, Value1, Value2 ...
And then multiple items which are stored in the hashtable as multiple rows.

Answer 1

Hashtables are not lists of objects with a Name and a Value property. That's just how PowerShell displays the data structure for your convenience. For processing a hashtable the way you tried you need an enumerator to produce such objects:
$hash.GetEnumerator() |
Select-Object #{n='FolderName';e={$_.Name}},
#{n='num1';e={$_.Value[0]}},
#{n='num2';e={$_.Value[1]}} |
Out-GridView
Or you can enumerate the keys of the hashtable, use them as the current objects in the pipeline, and look up the values by the respective key and index:
$hash.Keys |
Select-Object #{n='FolderName';e={$_}},
#{n='num1';e={$hash[$_][0]}},
#{n='num2';e={$hash[$_][1]}} |
Out-GridView
If you don't know the number of array elements beforehand you need an inner loop for processing the nested arrays, e.g. like this:
$hash.Keys | ForEach-Object {
$o = New-Object -Type PSObject -Property #{ 'FolderName' = $_ }
$a = $hash[$_]
for ($i = 1; $i -le $a.Count; $i++) {
$o | Add-Member -Type NoteProperty -Name "num$i" -Value $a[$i-1]
}
$o
} | Out-GridView
If you have a variable number of array elements, beware that PowerShell determines by the first object which properties will be displayed.