Powershell - Checking Security Group Members against another list - powershell

Question

A bit of context, I am trying to get a list of users from a security group, then check if any of those users do not have an assigned XenDesktop.
Please forgive me, I only started using Powershell yesterday so my formatting is off. It first grabs the users from the AD group then checks if that user has an assigned desktop, which works but I what I can't seem to get working is that if the user is found in that list, I want it to move onto the next username, instead it continues to check against every machine and then onto the final bits of code.
$checkusernames = Get-ADGroupMember "***AD security Group***" | Select SamAccountName
$desktops = get-brokerdesktop -DesktopGroupName Personal_WIN8 | Select MachineName, #{Name='AssociatedUserNames';Expression={[string]::join(“;”, ($_.AssociatedUserNames))}}
foreach ($username in $checkusernames.SamAccountName) {
foreach ($desktop in $desktops) {
If ($desktop.AssociatedUserNames -like "*$username*") {
write-host $username "is assigned to" $desktop.machinename
}
write-host $username "is not assigned to a desktop"
}
Write-host $username "is not assigned to anything"
pause
}

Answer 1

If you want to exit from a ForEach loop early you can do so with the Break keyword. For example:
$checkusernames = Get-ADGroupMember "***AD security Group***" | Select SamAccountName
$desktops = get-brokerdesktop -DesktopGroupName Personal_WIN8 | Select MachineName, #{Name='AssociatedUserNames';Expression={[string]::join(“;”, ($_.AssociatedUserNames))}}
foreach ($username in $checkusernames.SamAccountName) {
$machine = ''
foreach ($desktop in $desktops) {
If ($desktop.AssociatedUserNames -like "*$username*") {
$machine = $desktop.machinename
break
}
}
If ($machine) {
write-host $username "is assigned to" $desktop.machinename
} Else {
write-host $username "is not assigned to a desktop"
pause
}
}
This will stop the current cycle of the inner ForEach loop (once it has completed in it's entirety) without interrupting the ongoing cycle of the outer one.
Per the dicussion in the comments, i've also reorganised the code so that you only get a single output dependent on whether a desktop is matched to a user or not and it only pauses if it does not find a match.