将附件添加到电子邮件asp.net mvc 4

Question

我在我的网站上有反馈表格，我的表格中有<input type="file">，所以有时需要将附件添加到电子邮件中。
我在表单创建<input type="file">

@Html.TextBoxFor(model => model.ProjectInformation, null, new { type = "file", @class = "input-file" }) 

然后在我的控制器创建电子邮件，尝试添加附件

[HttpPost] 
    public ActionResult Feedback(FeedbackForm Model) 
    { 
     System.Net.Mail.MailMessage msg = new System.Net.Mail.MailMessage(); 
     msg.BodyEncoding = Encoding.UTF8; 

     msg.From = new MailAddress("test@mail.ru", @Resources.Global.Feedback_Email_Title); 
     msg.To.Add("tayna-anita@mail.ru"); 

     string message = @Resources.Global.Feedback_Name + ": " + Model.Name + "\n" 
         + @Resources.Global.Feedback_Email + ": " + Model.Email + "\n" 
         + @Resources.Global.Feedback_Phone + ": " + Model.Phone + "\n" 
         + @Resources.Global.Feedback_Company + ": " + Model.Company + "\n\n" 
         + Model.AdditionalInformation; 
     msg.Body = message; 
     msg.IsBodyHtml = false; 

     //Attachment 
     if (Model.ProjectInformation != null) 
     { 
      HttpPostedFileBase attFile = Model.ProjectInformation; 
      int attachFileLength = attFile.ContentLength; 
      if (attachFileLength > 0) 
      { 
       string strFileName = Path.GetFileName(Model.ProjectInformation.FileName); 
       Model.ProjectInformation.SaveAs(Server.MapPath(strFileName)); 
       Attachment attach = new Attachment(Server.MapPath(strFileName));     
       msg.Attachments.Add(attach); 
       string attach1 = strFileName; 
      } 
     } 

     SmtpClient client = new SmtpClient("smtp.mail.ru", 25); 
     client.UseDefaultCredentials = false; 
     client.EnableSsl = false; 

     try 
     { 
      client.Send(msg); 
     } 

     catch (Exception ex) 
     { 
     } 

     FeedbackForm tempForm = new FeedbackForm(); 
     return View(tempForm); 
    } 

，但我想我需要发送后删除附件，我尝试添加代码这里

 try 
     { 
      client.Send(msg); 
      if (attach1 != null) 
      File.Delete(Server.MapPath(attach1)); 
     } 

，但我得到了一些错误

和

我应该怎么做才能解决这个问题？

Answer 1

你应该声明一个变量之前if (Model.ProjectInformation != null)

事情是这样的：

string attach1; 
    if (Model.ProjectInformation != null) 
    { 
     . . . 
     if (attachFileLength > 0) 
     { 
      . . . 
      attach1 = strFileName; 
     } 
    }