无法发送 powershell 电子邮件 - 您不能在空值表达式上调用方法答案

【问题标题】：Cannot send powershell email - You cannot call a method on a null-valued expression无法发送 powershell 电子邮件 - 您不能在空值表达式上调用方法
【发布时间】：2015-08-29 00:49:09
【问题描述】：

我在我的本地机器上运行它，但是当我在另一台机器上尝试它时，它在同一个地方有相同的文件等，它失败并出现这个错误。

function email 
{
  $emailSmtpServer = "smtp-mail.outlook.com"
  $emailSmtpServerPort = "587"
  $emailSmtpUser = "USERNAME"
  $emailSmtpPass = "PASSWORD"
  $attachment = "C:\BackupLog.log"
  $emailMessage.Attachments.Add($attachment)
  $emailMessage = New-Object System.Net.Mail.MailMessage
  $emailMessage.From = "myemail@hotmail.co.uk"
  $emailMessage.To.Add( "myemail@civil.lmco.com" )
  $emailMessage.Subject = "Database Issues"
  $emailMessage.IsBodyHtml = $true
  $emailMessage.Body = "Test"

  $SMTPClient = New-Object System.Net.Mail.SmtpClient( $emailSmtpServer ,$emailSmtpServerPort )
  $SMTPClient.EnableSsl = $true
  $SMTPClient.Credentials = New-Object System.Net.NetworkCredential( $emailSmtpUser , $emailSmtpPass );

  $SMTPClient.Send( $emailMessage )
}

这是输出

PS C:\Users\XXLOCKRG1> email
You cannot call a method on a null-valued expression
At C:\database_backups\powershell scripts\functions\email.ps1:8 char:34
+ $emailMessage.Attachments.Add <<<< ($attachment)
+ CategoryInfo          : InvalidOperation: (Add:String) [], RuntimeException
+ FullyQualifiedErrorId : InvokeMethodOnNull

【问题讨论】：

标签： powershell

【解决方案1】：

你有两行代码顺序错误：

$emailMessage.Attachments.Add($attachment) # $emailMessage isn't instantiated yet
$emailMessage = New-Object System.Net.Mail.MailMessage

应该是：

$emailMessage = New-Object System.Net.Mail.MailMessage
$emailMessage.Attachments.Add($attachment)

您需要先实例化您的对象，然后才能引用其成员。

【讨论】：

【解决方案2】：

您正试图在实际创建 $emailMessage 对象之前为其添加附件。

$emailMessage.Attachments.Add($attachment)  #<---This is causing the error
$emailMessage = New-Object System.Net.Mail.MailMessage

只需重新排列行，将 New-Object 行放在 .Attachments.Add() 行之前。

话虽如此，您是否尝试过使用 Send-MailMessage cmdlet？它随 PowerShell 3.0 一起提供，比使用旧的 SMTP 对象容易得多。

【讨论】：