PowerShell New Pipline variable with String/ArrayValue in "{}" - arrays

Question

I need a solution to create an array in a certain format.
Background I export a SharePoint list and get my fields from an XML file.
The command (via PnP) to export is as follows:
$AllSPListItems = Get-PnPListItem $SharePointListName
$ItemsSelection = #{ L = "ID"; E = { $_["ID"] } },#{ L = "SP_SiteURL"; E = { $_["SP_SiteURL"] } }
$AllSPListItems | Select $ItemsSelection | Export-Csv -Path "C:\Temp\XYZ.csv"
That works, but here's what I want:
$ItemsSelection = #{ L = "$FieldDisplayName[0]"; E = { $_[$FieldURLName[0]] } },#{ L = "$FieldDisplayName[1]"; E = { $_[$FieldURLName[1]] } } }
I get the $FieldDisplayName and $FieldURLName variables from my XML.
Unfortunately I only get the following output:
#{ L = "ID"; E = { $_[$FieldURLName[0]] } },#{ L = "SP_SiteURL"; E = { $_[$FieldURLName[1]] } } }
Name Value
---- -----
E $FieldURLName[0]
L ID
E $FieldURLName[1]
L SP_SiteURL
So how can I get the value of "E", not the text?
The variables does not resolves.
Thanks a lot!

Answer 1

So how can I get the value of "E", not the text?
You get the text of the E scriptblock because it hasn't executed yet - that only happens once you use it with Select-Object.
To get the correct label names, remove the " quotes around the label expression:
$ItemsSelection = #{ L = $FieldDisplayName[0]; E = { $_[$FieldURLName[0]] } },#{ L = $FieldDisplayName[1]; E = { $_[$FieldURLName[1]] } } }
$AllSPListItems | Select $ItemsSelection | Export-Csv -Path "C:\Temp\XYZ.csv"

Answer 2

Ok i have a solution, is unattractive but apparently there is no other possibility.
I use the switch Case:
switch ($FieldDisplayName.Length){
1 {$items | Select #{ L = $FieldDisplayName[0]; E = { $_[$FieldURLName[0]] } } | Export-Csv -Path "C:\install\ExportV1.csv"}
2 {$items | Select #{ L = $FieldDisplayName[0]; E = { $_[$FieldURLName[0]] } },#{ L = $FieldDisplayName[1]; E = { $_[$FieldURLName[1]] } } | Export-Csv -Path "C:\install\ExportV1.csv"}
}