Cannot add items to Powershell array - arrays

Question

I'm relatively new to Powershell but haven't been able to find an answer online.
I'm trying to get the number of emails per disabled user in exchange 2010, but also need to get the user's title form AD as the organization groups users by type using the Title attribute in AD
I've written the following but I'm unable to get the data I need, it just returns Length and numbers to the CSV file e.g.
"length"
"10"
"3"
"34"
If I leave $title out of the assignment of $Disabled+= the user's name and item count is added to the csv file, but I really need the title also. Can anyone point out where I'm going wrong.
Import-Module ActiveDirectory
$i=0
$disUsers = Get-ADUser -Filter * -SearchBase "ou=User Disabled Accounts,dc=test,dc=com" -Properties SamAccountName,Title
$Disabled = #()
$disUsers | Foreach-Object{
$sam = $_.SamAccountName
$title = $_.Title
$mailDetail=Get-MailboxStatistics $sam | Select -Property DisplayName,ItemCount
$Disabled += $title, $mailDetail
$i++;
}
$Disabled | Export-Csv -Path $env:userprofile\desktop\DisabledADUserTitlewithMailbox.csv -NoTypeInformation
Working with the code provided by Steve unfortunately gives the following errors
Exception calling "Add" with "2" argument(s): "Item has already been added. Key in dictionary: 'ADCDisabledMail' Key being added: 'ADCDisabledMail'" ...
Exception calling "Add" with "2" argument(s): "Key cannot be null. Parameter name: key"...
EDIT
With help from Steven I was able to get this working with the following
'Import-Module ActiveDirectory'
$i=0
$disUsers=Get-ADUser -Filter {mailNickName -like '*'} -SearchBase "ou=User Disabled Accounts,dc=test,dc=com" -Properties SamAccountName,Title
$dis2 = $disUsers.count
$DisabledUser = #()
$disUsers | Foreach-Object{
Write-Host "Processing record $i of $dis2"
$sam = $_.SamAccountName
$title = $_.Title
$mailDetail=Get-MailboxStatistics $sam | Select-Object DisplayName, #{ Name = 'Title'; Expression = {$title}}, ItemCount
$DisabledUser+= $mailDetail
$i++;
}
$DisabledUser | Export-Csv -Path $env:userprofile\desktop\DisabledADUserTitlewithMailbox.csv -NoTypeInformation

Answer 1

It sounds like what you are really trying to do is relate data to create a small report. You are dealing with data coming from different commands so you need a property to join on. In this case I would look at the LegacyExchangeDN AD attribute and the LegacyDN property returned by Get-MailboxStatistics. The code might look something like:
$DisabledUsers = #{}
Get-ADUser -SearchBase 'ou=User Disabled Accounts,dc=test,dc=com' -Filter * -Properties 'Title','legacyExchangeDN' |
ForEach-Object{ $DisabledUsers.Add( $_.legacyExchangeDN, $_ ) }
$DisabledUsers.Values.SamAccountName |
Get-MailboxStatistics |
Select-Object DisplayName, ItemCount, #{ Name = 'Title'; Expression = { $DisabledUsers[$_.LegacyDN].Title } }
This will output something like:
DisplayName ItemCount Title
----------- --------- -----
Mr. Smith 113576 Executives
If you would rather it go directly to a CSV file simply add the Export-CSV command after the Select-Object command, like below:
$DisabledUsers = #{}
Get-ADUser -SearchBase 'ou=User Disabled Accounts,dc=test,dc=com' -Filter * -Properties 'Title','legacyExchangeDN' |
ForEach-Object{ $DisabledUsers.Add( $_.legacyExchangeDN, $_ ) }
$DisabledUsers.Values.SamAccountName |
Get-MailboxStatistics |
Select-Object DisplayName, ItemCount, #{ Name = 'Title'; Expression = { $DisabledUsers[$_.LegacyDN].Title } } |
Export-CSV -Path $env:userprofile\desktop\DisabledADUserTitlewithMailbox.csv -NoTypeInformation
I would've used Get-User from the Exchange Management Shell, however it doesn't have the LegacyExchangeDN as a returned property. It does have SamAccountName, but using it would've forced me to bridge everything through Get-Mailbox. At any rate, this is a very common technique to use a hash table to reference related values in a different collection.
I'm sure some additional work will be needed to get the report just right.
An aside, try to avoid using the += operator to append arrays. The best way to get an array is to let PowerShell provide it as I did above. However, if you can't get around it the most common alternative is an ArrayList. Like most things there are several ways to go about it below is just 1 example.
# To create:
$ArrList = [Collections.ArrayList]#()
#To Add a value:
[Void]$ArrList.Add( 'ValueOrObjectHere' )
Note: Documentation / discussion of += and ArrayList's are easy to
find with the Google machine...
Update:
Addressing Errors Noted in most recent edit:
The first error is basically impossible. Forgive me but I must assume you made some mistake to generate this error. LegacyExchangeDN should always start with '/o=...' and they key cited by the error was 'ADCDisabledMail' . Also LegacyExchangeDNs are naturally unique in Active Directory, so there's almost no chance you'd have a duplicate. As such, I made no effort, and none is warranted, to prevent such an unlikely error.
Note: If you are repeatedly testing the code you have to recreate the
hash, $DisabledUsers = #{} else the hash will exist from the
previous run and duplicate key errors are a certainty...
The second error, they 'key cannot be null' might be due to non-mailbox enabled AD accounts in the referenced OU effectively causing the LegacyExchangeDN attribute to be null for those users. Hence, null key.... You can avoid that by modifying the filter to only return mail enabled users:
$disUsers = Get-ADUser -Filter { mailNickName -like '*' } -SearchBase "ou=User Disabled Accounts,dc=test,dc=com" -Properties SamAccountName,Title
Note: For reference, mailNickName is the alias propertry typically
returned with Get-Mailbox