快速确定用户帐户是否是AD组成员的最佳方法？

$username = "user123"
$groupname = "group123"
$domain = "example.com"

$adsi = [ADSI]"WinNT://$domain/$groupname,group"
$members = @($adsi.psbase.Invoke("Members"))

foreach ($member in $members) {
    $membername = $member.GetType().InvokeMember("Name", 'GetProperty', $null, $member, $null)
    if ($membername -eq $username) {
        Write-Host "$username is a member of $groupname"
        break
    }
}