Report confusion. without += Trying to deal with $null - powershell

Question

I run an all users command for calendar delegation. I then report. The issue is how do I include someone that has no calendar delegation ? (Code Below)
In this line If ($null -ne $DelegateCal) I make sure someone has calendar delegation then build the object.
If I don't use += I am not sure how to build the object when I add a Else for the $null
<#All Google Calendar delegate report#>
# filename function
Import-Module C:\tasks\Modules\MRNAP\MRNAP.psm1
$AllGoogleUsers = gam print users fields suspended | ConvertFrom-Csv | Where-Object { $_.suspended -eq $False } | Select-Object -ExpandProperty PrimaryEmail
ForEach ($UserEmail in $AllGoogleUsers) {
$DelegateCal = gam calendar $UserEmail print acls | convertfrom-csv | Where-Object { $_.'scope.type' -eq 'user' -and $_.'Scope.value' -ne $UserEmail } -ErrorAction SilentlyContinue
If ($null -ne $DelegateCal) {
$CalendarDelegateList = foreach ($line in $DelegateCal) {
[PSCustomObject]#{
Owner = $line.calendarId
Type = 'Calendar'
Delegate = $line.'scope.value'
Role = $line.role
}
}
}
}
$CalendarDelegateList = $CalendarDelegateList | Sort-Object -Property Owner
$filename = MRNAP -ReportName WhoIsCalendarDelegated -Move
$CalendarDelegateLis | Export-Csv $filename -NoTypeInformation | Format-Table text-align=left -AutoSize
This is how I would do it with +=
$AllGoogleUsers = gam print users fields suspended | ConvertFrom-Csv | Where-Object { $_.suspended -eq $False } | Select-Object -ExpandProperty PrimaryEmail
ForEach ($UserEmail in $AllGoogleUsers) {
$DelegateCal = gam calendar $UserEmail print acls | convertfrom-csv | Where-Object { $_.'scope.type' -eq 'user' -and $_.'Scope.value' -ne $UserEmail } -ErrorAction SilentlyContinue
If ($null -ne $DelegateCal) {
foreach ($line in $DelegateCal) {
$CalendarDelegateList += [PSCustomObject]#{
Owner = $UserEmail
Type = 'Calendar'
Delegate = $line.'scope.value'
Role = $line.role
}
}
}
Else {
$CalendarDelegateList += [PSCustomObject]#{
Owner = $UserEmail
Type = 'Calendar'
Delegate = 'None'
Role = 'None'
}
}
}

Answer 1

It is always preferable to let PowerShell collect statement output in an array for you rather than building a list of outputs manually - both for concision and performance; see this answer for more information.
This even works with nested foreach loops, as in your case.
Applied to your scenario (abridged):
[array] $CalendarDelegateList =
foreach ($UserEmail in $AllGoogleUsers) {
$DelegateCal = gam calendar $UserEmail print acls | ConvertFrom-Csv | Where-Object { $_.'scope.type' -eq 'user' -and $_.'Scope.value' -ne $UserEmail } -ErrorAction SilentlyContinue
If ($null -ne $DelegateCal) {
foreach ($line in $DelegateCal) {
# Construct *and ouput* a [pscustomobject] instance.
[PSCustomObject]#{
Owner = $UserEmail
# ...
}
}
}
Else {
[PSCustomObject]#{
Owner = $UserEmail
# ...
}
}
}
All [pscustomobject] instances (implicitly) output from inside the foreach loop (whether directly or from the nested one) are automatically collected in variable $CalendarDelegateList.
Note:
With two or more output objects from the loop, the $CalendarDelegateList variable receives a regular PowerShell array (of type [object[]]).
The [array] type constraint (short for: [object[]]) additionally ensures that the result is an array even if the loop outputs only one object.