Adding data to a PowerShell array / Add-Member

Question

I am trying to write a PowerShell script that will compile together a list of groups in Active Directory along with the members of each group. My ultimate goal is to export this out to a CSV files, so I want the final PowerShell multi-dimensional array to have the following format:

GroupName           GroupMember
Domain Admins       Henry Doe
Domain Admins       Melody Doe
Domain Names        Doe Ray Me
Domain Users        John Doe
Domain Users        Jane Doe
(etc…)

I am using the following code to try and do this:

[array]$arrGroupMemberList = New-Object PSObject
Add-Member -InputObject $arrGroupMemberList -membertype NoteProperty -Name 'GroupName' -Value ""
Add-Member -InputObject $arrGroupMemberList -membertype NoteProperty -Name 'GroupMember' -Value ""
[array]$arrGroupMemberList = @()

[array]$arrGroupNameObjects = Get-ADGroup -Filter * | Where-Object {$_.Name -Like "Domain*"}

If ($arrGroupNameObjects.Count -ge 1)
    {
    ## Cycle thru each group name and get the members
    $arrGroupNameObjects | ForEach-Object {
        [string]$strTempGroupName = $_.Name
        $arrGroupMemberObjects = Get-ADGroupMember $strTempGroupName -Recursive
        If ($arrGroupMemberObjects.Count -ge 1)
            {
            ## Cycle thru the group members and compile into the final array
            $arrGroupMemberObjects | ForEach-Object {
                $arrGroupMemberList += $strTempGroupName, $_.Name
            }
            }
    }
    }

My problem is, I keep ending up with the following as my array:

Domain Admins
Henry Doe
Domain Admins
Melody Doe
Domain Names
Doe Ray Me
Domain Users
John Doe
Domain Users
Jane Doe

I've tried a few different ways and I've searched but haven’t found the answer anywhere. I’m sure that it is something simple, but what am I doing wrong? Can I create a multi-dimensional array with the necessary data like I am trying to do? If I use the following instead:

            ## Cycle thru the group members and compile into the final array
            $arrGroupMemberObjects | ForEach-Object {
                $arrGroupMemberList[$intIndex].GroupName = $strTempGroupName
                $arrGroupMemberList[$intIndex].GroupMember = $_.Name
                $intIndex++

I end up with errors like:

Property 'GroupMember' cannot be found on this object; make sure it exists and is settable.
Property 'GroupName' cannot be found on this object; make sure it exists and is settable.

Thanks

**UPDATE**

I may have found out where my problem is, it may be when I am adding the array members. At the end of my PowerShell script, I am adding the following line of code:

$arrGroupMemberList | Get-Member

There are no properties, my elements are not there, even though I added them with Add-Member cmdlet earlier in the script. Am I using the Add-Member cmdlet properly?

Answer 1

I figured out what I was doing wrong - I was using Add-Member incorrectly. I was trying to use Add-Member to add members to a collection, and it doesn't seem to work that way. Something that simple but I really didn't see it discussed anywhere. So I found some examples and did the trial-and-error thing and got it to work. So I wanted to post an update back here in case anyone else has the same issue. The following code works just like I want it to (and will create an array with a list of groups from Active Directory along with the group members in each group):

[array]$arrGroupNameObjects = Get-ADGroup -Filter * | Where-Object {$_.Name -Like "Domain*"}

If ($arrGroupNameObjects.Count -ge 1)
    {
    ## Cycle thru each group name and get the members
    $arrGroupNameObjects | ForEach-Object {
        [string]$strTempGroupName = $_.Name
        $arrGroupMemberObjects = Get-ADGroupMember $strTempGroupName -Recursive
        If ($arrGroupMemberObjects.Count -ge 1)
            {
            ## Cycle thru the group members and compile into the final array
            $arrGroupMemberObjects | ForEach-Object {
                $objGroupMember = New-Object PSObject
                Add-Member -InputObject $objGroupMember -membertype NoteProperty -Name 'GroupName' -Value $strTempGroupName
                Add-Member -InputObject $objGroupMember -membertype NoteProperty -Name 'GroupMemberName' -Value $_.Name
                [array]$arrGroupMemberList += $objGroupMember
            }
            }
    }
    }

Answer 2

Looks like you need to use the following line to add rows to your table (two dimensional array).

$arrGroupMemberList += ,($strTempGroupName, $_.Name)

http://blogs.msdn.com/b/powershell/archive/2007/01/23/array-literals-in-powershell.aspx