Try-Catch-最终无法在 PowerShell 脚本中使用 Send-Mailmessage

Question

我在帐户过期通知电子邮件中使用 try-catch-finally 块，并且不考虑 finally 块中的 if 条件：

    Write-Host $sName " : Selected to receive email: password will expire in "$days
         if (($emailaddress) -ne $null) {
             try {
                    Send-Mailmessage -smtpServer $SMTPServer -from $MailSender -to $emailaddress -subject $subject2 -body $EmailBody -bodyasHTML -priority High -Encoding $textEncoding -ErrorAction Stop 
                } 
                catch {
                    write-host "Error: Could not send email to $recipient via $smtpServer"
                    $sent = "Send fail"
                    $countfailed++
                } 
                finally {
                    if ($error.Count -eq 0) {
                        write-host "Sent email for $sName to $emailaddress"
                        $countsent0++
                        }
                }
        } else {
                Write-Host "$dName ($sName) has no email address."
                $sent = "No"
                $countnotsent++
            }

期望 $countsent0 增加并且 $sent 设置为适当的消息。 catch 块有效（$countfailed 递增并且 $sent 设置为“发送失败”）。 finally 块之后的最后一个 else 语句也有效（如果帐户没有电子邮件地址 $countnotsent 递增并且 $sent 设置为“否”）。

Answer 1

• 自动

  $Error

  变量是迄今为止在整个会话中发生的所有错误的运行日志，因此除非您事先运行

  $Error.Clear()

  ，否则您可能会得到

  if ($error.Count -eq 0) { ... }

  的误报

• 但是，由于您可能不想删除整个会话的此日志，因此请考虑使用简单的布尔变量来指示是否捕获了错误。

一个简化的例子：

$countsent0 = 0
$ok = $false  # Helper Boolean variable.
try {
  1 / 0  # Simulate an error that can be caught.
  $ok = $true # At the end of this block, signal that no error occurred.
}
catch {
  Write-Warning 'oops!'
}
finally {
  if ($ok) { $countsent0++; Write-Host 'All''s well'. }
}

"`$countsent0: $countsent0"

但是，鉴于您的

catch

块不会中止执行，您甚至不需要

finally

块：

$countsent0 = 0
try {
  1 / 0  # Simulate an error that can be caught.
  # Getting here implies success.
  $countsent0++ 
}
catch {
  Write-Warning 'oops!'
}

"`$countsent0: $countsent0"

Answer 2

try 
        {                                   
            Send-MailMessage           
        }
              
        catch [System.Net.Mail.SmtpException] {
            
            Write-Host $_.Exception.Message           
            
          
        }