How to change the loop Powershell content from the csv file automatically?

Question

I want to change the loop PowerShell content from the CSV file automatically, is there someone know how to achieve the goal?

I want to run the loop PowerShell as below,I export the AD Group Members UPN with CSV file like One@contoso.com. I want to change the Userlist with the UPN automatically because there have more than 1000 members in the group and I have to change the upn from one@contoso.com to 'one@contoso.com' ,it's easy to make a miss, is there has a smart way can achieve the goal,thanks.

Export-ADGroupmember UPN:

Get-ADGroupmember -identity adgroup | % { get-aduser $_.samaccountname | select userprincipalname } | export-csv upn.csv -notypeinformation 

Loop PowerShell:

Loop PowerShell:
$UserList = @(
    'One@contoso.com'
    'Two@contoso.com'
    'Three@contoso.com'
    'Four@contoso.com'
    'Five@contoso.com'
    )

foreach ($UL_Item in $UserList)
    {
    $ARAGU_Params = @{
        TenantName = "contoso"
        HostPoolName = "contosoHostPool"
        AppGroupName = "Desktop Application Group"
        UserPrincipalName = $UL_Item
        }
    Add-RdsAppGroupUser @ARAGU_Params
}

Answer 1

You cant change content in your $UserList .More precisely, it is possible but affect the performance since You will need to read from the file and break it into segments. The best way is to download all users at once.You can do it like this:

$UserList=Get-ADGroupmember -identity adgroup | % { get-aduser $_.samaccountname | select userprincipalname } 
foreach ($UL_Item in $UserList)
    {
    $ARAGU_Params = @{
        TenantName = "contoso"
        HostPoolName = "contosoHostPool"
        AppGroupName = "Desktop Application Group"
        UserPrincipalName = $UL_Item.userprincipalname
        }
    Add-RdsAppGroupUser @ARAGU_Params
}