MVCMailer SendAsync和删除附件

Question

我无法让MVCMailer在异步发送电子邮件后删除附件。

我不知道如何处理消息以释放附加到消息附件的进程。

按照here的说明...

    private IUserMailer userMailer = new UserMailer();

    public IUserMailer UserMailer
    {
        get { return this.userMailer; }
        set { this.userMailer = value; }
    }


      using (SmtpClientWrapper client = new SmtpClientWrapper())
        {
            client.SendCompleted += (sender, e) =>
            {
                if (e.Error != null || e.Cancelled)
                {
                    // Handle Error
                }

                //Use e.UserState

                //?? How can I use the userstate?? There are no
                // instructions??

                // Delete the saved attachments now. 
                // This will not work since the mailmessage process 
                // is still attached.
                Parallel.ForEach(imageList, image =>
                {

                    if (System.IO.File.Exists(image))
                    {
                        System.IO.File.Delete(image);
                    }

                });

            };

            // SendAsync() extension method: using Mvc.Mailer
            // farm is my model imageList is a list of file locations for the 
            // uploaded attachments
          UserMailer.Submission(farm, imageList).SendAsync("user state object",
                                                            client);
        }

Answer 1

您可以运行将SmtpClientWrapper从using语句中分离出来，并在清理附件之前手动对其调用dispose。

Answer 2

要展示我成功的解决方案是什么：

        MailMessage message = UserMailer.Submission(farm, imageList);

        SmtpClientWrapper client = new SmtpClientWrapper();

        client.SendCompleted += (sender, e) =>
        {
            if (e.Error != null || e.Cancelled)
            {
                // Handle Error
            }

            if (message != null)
            {
                message.Attachments.Dispose();
                message.Dispose();

                // Delete the saved attachments now
                Parallel.ForEach(imageList, image =>
                {

                    if (System.IO.File.Exists(image))
                    {
                        System.IO.File.Delete(image);
                    }

                });

            }

            client.Dispose();

        };

        // SendAsync() extension method: using Mvc.Mailer
        message.SendAsync("farm message", client);