/// <summary>
        /// 发送邮件
        /// </summary>
        /// <param name="server">SMTP服务器的主机名</param>
        /// <param name="sender">发送邮件账号</param>
        /// <param name="recipient">接收邮件</param>
        /// <param name="subject">邮件主题</param>
        /// <param name="body">邮件正文</param>
        /// <param name="isBodyHtml">是否支持html</param>
        /// <param name="encoding">编码格式</param>
        /// <param name="isAuthentication"></param>
        /// <param name="files">附件地址</param>
        public static void Send(string server, string sender, string recipient, string subject,
    string body, bool isBodyHtml, Encoding encoding, bool isAuthentication, params string[] files)
        {
            var smtpClient = new SmtpClient(server);
            var message = new MailMessage(sender, recipient)
            {
                IsBodyHtml = isBodyHtml,
                SubjectEncoding = encoding,
                BodyEncoding = encoding,
                Subject = subject,
                Body = body
            };
            message.Attachments.Clear();
            if (files != null && files.Length != 0)
            {
                foreach (var t in files)
                {
                    var attach = new Attachment(t);
                    message.Attachments.Add(attach);
                }
            }
            if (isAuthentication)
            {
                smtpClient.Credentials = new NetworkCredential(SmtpConfig.Create().SmtpSetting.User,
                    SmtpConfig.Create().SmtpSetting.Password);
            }
            smtpClient.Send(message);
        }