Array causing 'system.outofmemoryexception' - arrays

Question

I am running the below script and it is causing exception of type 'system.outofmemoryexception' was thrown
I believe that it is due to the #Results array growing past the 2gb allocated to windows shell. Is there possibly a way to iterate through the results, or am I stuck with allocating more memory (which could ultimately be a lot...)?
$Path = "path to output"
### Get all PF
$publicFolders = Get-PublicFolder "Public Folder Name" -Recurse -resultsize unlimited | Select-Object *
### Array to contain results
$results = #()
###Begin looping through each PF and grab each user/group with AccessRights to that folder
$final = ForEach($pf in $publicFolders){
$perms = Get-PublicFolderClientPermission -Identity $pf.Identity | Where-Object {$_.User -notmatch "Default|Anonymous|S-X-X-XX"}
Foreach($perm in $perms){
$temp = [PSCustomObject]#{
MailFolderName = $pf.Identity
UserWithPerms = $perm.User
AccessRights = $perm | Select-Object -ExpandProperty AccessRights
}
$results += $temp
}
}
$final | Export-Csv $path -NoTypeInformation
Am I barking up the wrong tree?
Thanks in advance.

Answer 1

Use the ForEach-Object cmdlet instead of a foreach(){} loop statement for the outer loop - this way you can start piping the output to Export-Csv immediately instead of buffering it in an array:
$publicFolders |ForEach-Object {
$pf = $_
$perms = Get-PublicFolderClientPermission -Identity $pf.Identity | Where-Object {$_.User -notmatch "Default|Anonymous|S-X-X-XX"}
Foreach($perm in $perms){
[PSCustomObject]#{
MailFolderName = $pf.Identity
UserWithPerms = $perm.User
AccessRights = $perm | Select-Object -ExpandProperty AccessRights
}
}
} | Export-Csv $path -NoTypeInformation
Alternatively, flush the partial set of results to file after enumerating the permissions for each folder:
ForEach($pf in $publicFolders){
$perms = Get-PublicFolderClientPermission -Identity $pf.Identity | Where-Object {$_.User -notmatch "Default|Anonymous|S-X-X-XX"}
$results = Foreach($perm in $perms){
[PSCustomObject]#{
MailFolderName = $pf.Identity
UserWithPerms = $perm.User
AccessRights = $perm | Select-Object -ExpandProperty AccessRights
}
}
# flush the buffer before moving to the next set of permissions
$results |Export-Csv $path -NoTypeInformation -Append
}