PowerShell脚本ErrorActionPreference

Question

为什么从PowerShell作为脚本运行以下代码中的try / catch语句不起作用？如果我在运行脚本之前将$ ErrorActionPreference设置为'Stop'，则按预期运行，但是如果将其设置为'Continue'，则好像脚本中的$ ErrorActionPreference ='Stop'行无效。我输入了两个DC都不存在的用户的姓氏和名字。

$UserCredential = Get-Credential -Credential
$ExchangeSession = New-PSSession -ConfigurationName Microsoft.Exchange - 
ConnectionUri 'serveromitted' -Authentication Kerberos -Credential 
$UserCredential
$dcs = 'dc1','dc2'
$ErrorCount = 0
$firstname = Read-Host -Prompt 'Enter First Name'
$lastname = Read-Host -Prompt 'Enter Last Name'
$alias = $firstname.substring(0,1).tolower()+$lastname.tolower()
$primarysmtpaddress = $alias+'@domain.com'
import-pssession $ExchangeSession
$ErrorActionPreference = 'Stop'


foreach ($dc in $dcs)
{
    try {
    Get-Recipient -DomainController $dc -Identity $PrimarySmtpAddress -erroraction stop
    }   
catch {
            $MailboxError = $_.Exception.Message
            $MailboxErrorRegex = "^The operation couldn't be performed because object '.*' couldn't be found on '.*'\.$"
            if ($MailboxError -match $MailboxErrorRegex) 
            {
                $ErrorCount++
            }
        }
$ErrorCount
}

在此先感谢您的帮助。