MVCMailer SendAsync 和删除附件

Posted 2023-03-15

【中文标题】MVCMailer SendAsync 和删除附件

【英文标题】：MVCMailer SendAsync and deleting attachments

【发布时间】：2011-10-25 10:36:51

【问题描述】：

异步发送电子邮件后，我无法让 MVCMailer 删除附件。

我不知道如何处理邮件以释放附加到邮件附件的进程。

按照说明here....

    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);
        

【参考方案1】：

您可以将 SmtpClientWrapper 从 using 语句中中断，并在清理附件之前手动调用 dispose。

【讨论】：

我添加自己的答案只是为了展示我写的内容，但由于它基于此建议，我将其标记为正确答案。

【参考方案2】：

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);