MailMessage 带附件发邮件-Firefox中文显示正常，网页打开邮件中文名附件乱码

悬赏园豆：20 [待解决问题]

  //attachment = new Attachment(path, MediaTypeNames.Application.Octet);
                        //attachment.Name = System.IO.Path.GetFileName(path); 
                        //attachment.NameEncoding = Encoding.GetEncoding("gb2312");//
                        //attachment.TransferEncoding = System.Net.Mime.TransferEncoding.Base64;
                        //attachment.ContentDisposition.Inline = true; 
                        //attachment.ContentDisposition.DispositionType = System.Net.Mime.DispositionTypeNames.Inline;

                        string extName = Path.GetExtension(fileName);
                        if (extName == ".zip" || extName == ".rar")
                        {
                            attachment = new System.Net.Mail.Attachment(new FileStream(path, FileMode.Open, FileAccess.Read), fileName, MediaTypeNames.Application.Zip);
                        }
                        else
                        {
                            attachment = new System.Net.Mail.Attachment(new FileStream(path, FileMode.Open, FileAccess.Read), fileName, MediaTypeNames.Application.Octet);
                        }
                        //string cid = attachment.ContentId;//关键性的地方，这里得到一个id数值 
                        //ContentDisposition disposition = attachment.ContentDisposition;
                        //disposition.CreationDate = System.IO.File.GetCreationTime(path);
                        //disposition.ModificationDate = System.IO.File.GetLastWriteTime(path);
                        //disposition.ReadDate = System.IO.File.GetLastAccessTime(path);
                        mailMessage.Attachments.Add(attachment);