File.Delete()的解决

 1 public bool SendMail()

 2         {

 3             MailMessage myEmail = new MailMessage();

 4             myEmail.From = new MailAddress(fromMail.Text.Trim());

 5             myEmail.To.Add(toMail.Text.Trim());

 6             myEmail.Subject = subject.Text.Trim();

 7             myEmail.IsBodyHtml = format.SelectedItem.Value == "0" ? false : true;

 8             //附件  

 9             string ServerFileName = "";

10             if (this.upfile.PostedFile.ContentLength != 0)

11             {

12                 string upFileName = this.upfile.PostedFile.FileName;

13                 string[] strTemp = upFileName.Split('.');

14                 string upFileExp = strTemp[strTemp.Length - 1].ToString();

15                 ServerFileName = Server.MapPath(@"/upload/" + DateTime.Now.ToString("yyyyMMddHHmmss") + "." + upFileExp);

16                 this.upfile.PostedFile.SaveAs(ServerFileName);

17                 myEmail.Attachments.Add(new Attachment(ServerFileName));

18 

19             }

20 

21             myEmail.Body = body.Text.Trim();

22             myEmail.BodyEncoding = Encoding.UTF8;

23             myEmail.Priority = MailPriority.High;

24             SmtpClient smtp = new SmtpClient();

25             smtp.Credentials = new NetworkCredential("[email protected]", "12619890219");

26             smtp.Port = 25;

27             smtp.Host = "smtp.126.com";

28             smtp.EnableSsl = false;

29             try

30             {

31                 smtp.Send(myEmail);

32                 myEmail.Dispose();

33                 File.Delete(ServerFileName);

34             }

35             catch (Exception e)

36             {

37                 myEmail.Dispose();

38                 File.Delete(ServerFileName);

39                 throw;

40             }

41             return true;

42         }

需要释放资源。http://bbs.csdn.net/topics/390074326