Searching a powershell array containing active directory users - arrays

Question

I'm having an issue trying to find the index number of an item in an array that contains Active directory users.
I create the array as follows:
$outarray = #()
$outarray = get-aduser -Filter * -Properties LastLogon | select "Name","SAMAccountName","LastLogon" | sort samaccountname
Now i have the users in an array, and i can prove it using standard variable queries
$outarray[0]
$outarray[1]
Returns exactly what i expect.
BUT
I completely fail to search for the index of a name or SAMAccountName in the array, as they are properties of the array.
$index = [array]::IndexOf($outarray.samaccountname, "testuser")
returns -1 (not found) or 0 only if testuser is the FIRST user in the array.
I cannot find any other user index in the array.
My goal after getting the index is to use it to update the property for lastlogon. This works if i do it manually
e.g.
$outarray[123].lastlogon = 12345678
The only way i can make this work is to manually build the array initially, one entry at a time instead of filling directly
foreach ($user in $outArray)
{
$myobj = #()
$myobj = "" | Select "Name","SAMAccountName","LastLogon"
#fill the object
$myobj.Name = $user.name
$myobj.SAMAccountName = $user.samaccountname
$myobj.LastLogon = $user.LastLogon
#Add the object to the array
$userarray += $myobj
}
$userarray[[array]::IndexOf($userarray.samaccountname, "testuser")].LastLogon = 12345678
Then the search works. I assume this has to do with property types, but im completely out my depth by this stage.
Thanks in advance for any help, I'm no expert on powershell arrays, they confuse me! :)

Answer 1

I think you're looking at this the wrong way. Instead of finding the index of a specific item and then access that item by its index you could do it the PoSh way by filtering the array for the item you want to update, like this:
$userarray | ? {
$_.SamAccountName -eq 'testuser'
} | % {
$_.LastLogon = 12345678
}
or like this:
$acct = $userarray | ? { $_.SamAccountName -eq 'testuser' } | select -First 1
$acct.LastLogon = 12345678