发送附件邮件

            string MailFrom = "******";
            string MailPWD = "*****";
            string MailFName = "******";
            string MailTo = "****";
            string MailCc = "****";
            string MailSubject = "邮件激活";
            string MailContent = "在返回给拟稿人的时候，只要你把拟稿人的部门id去掉就会问题再现了。G_pnodes";
            string Mailattachment = "C:\Documents and Settings\Administrator\桌面\NET资料\TabPublc\TabPublc\OnLoad\demo要求.docx";

            if (EmailClass.EmailClass.SendEmail(MailFrom, MailPWD, MailFName, MailTo, MailSubject, MailContent, Mailattachment, MailCc))
            { 
            
            }

 　　　　/// <summary>
        /// 发送邮件
        /// </summary>
        /// <param name="mailFrom">登陆用户名</param>
        /// <param name="mailPWD">登陆密码</param>
        /// <param name="mailFName">发送者用户名</param>
        /// <param name="mailTo">接收邮件的地址</param>
        /// <param name="mailSubject">邮箱标题</param>
        /// <param name="mailContent">邮箱内容</param>
        /// <param name="mailAttachment">附件路径，多附件路径中间必须用","隔开</param>
        /// <param name="mailCc">抄送的邮箱地址，多接收地址中间必须用","隔开</param>
        /// <returns>返回发送邮箱的结果</returns> 
        public static bool SendEmail(string mailFrom, string mailPWD, string mailFName, string mailTo, string mailSubject, string mailContent, string mailAttachment = "", string mailCc = "")
        {
            // 设置发送方的邮件信息,例如使用网易的smtp
            //string mailFrom = "fjptwwf@163.com"; //登陆用户名
            //string mailPWD = "**18";//授权密码   163邮箱必须用授权密码

            #region SMTP服务器
            string _smtp=mailFrom.Split('@')[1].Split('.')[0].ToUpper();
            switch (_smtp)
            {
                case "QQ"://QQ邮箱
                    _smtp = "smtp.qq.com";
                    break;
                case "163"://网易163邮箱
                    _smtp = "smtp.163.com";
                    break;
                case "SINA"://新浪邮箱
                    _smtp = "smtp.sina.com.cn";
                    break;
                case "SOHU"://搜狐邮箱
                    _smtp = "smtp.sohu.com";
                    break;
                case "126"://126邮箱
                    _smtp = "smtp.126.com";
                    break;
                case "188"://188邮箱
                    _smtp = "smtp.188.com";
                    break;
            }
            #endregion

            // 邮件服务设置
            SmtpClient smtpClient=new SmtpClient();
            smtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;//指定电子邮件发送方式
            smtpClient.Host = _smtp; //指定SMTP服务器
            smtpClient.Credentials = new System.Net.NetworkCredential(mailFrom, mailPWD);//用户名和密码
            smtpClient.EnableSsl = true;

            // 发送邮件设置        
            MailMessage mailMessage = new MailMessage();
            mailMessage.From = new MailAddress(mailFrom, mailFName);
            mailMessage.To.Add(mailTo);//收件人地址，多接收地址中间必须用","隔开
            mailMessage.Subject = mailSubject;//主题
            mailMessage.Body = mailContent;//内容
            mailMessage.CC.Add(new MailAddress(mailCc)); //抄送邮箱地址，多接收地址中间必须用","隔开
            mailMessage.BodyEncoding = System.Text.Encoding.UTF8;//正文编码
            //mailMessage.BodyEncoding = System.Text.Encoding.GetEncoding("gb2312");
            mailMessage.IsBodyHtml = true;//设置为HTML格式
            mailMessage.Priority = MailPriority.Normal;//优先级

            if (mailAttachment != "")
                mailMessage.Attachments.Add(new Attachment(mailAttachment));
            try
            {
                smtpClient.Send(mailMessage); // 发送邮件
                return true;
            }
            catch (SmtpException ex)
            {
                return false;
            }
        }