#region 邮件帮助类    //+-------------------------------------------------------------------+    //+ FileName:         MailHelper.cs    //+ File Created:   2016-9-12    //+-------------------------------------------------------------------+    //+ Purpose:        邮件帮助类    //+-------------------------------------------------------------------+    //+-------------------------------------------------------------------+    //+ UpdateHistory:  修改的内容     //+-------------------------------------------------------------------+    /// <summary>    /// 邮件帮助类    /// </summary>    public static class SendMailHelper    {        /// <summary>        /// 发送邮件        /// </summary>        /// <param name="request">邮件内容对象</param>        /// <returns>发送邮件所遇到的异常</returns>        public static string SendMail(MailRequest request)        {            try            {                MailMessage mail = new MailMessage();                if (string.IsNullOrEmpty(request.From))                {                    request.From = WebConfigurationManager.AppSettings["DefaultMailFrom"];                }                mail.From = new MailAddress(request.From);                PaserMailAddress(request.To, mail.To);                PaserMailAddress(request.CC, mail.CC);                PaserMailAddress(request.Bcc, mail.Bcc);                mail.Subject = request.Subject;                mail.SubjectEncoding = System.Text.Encoding.UTF8;                mail.Body = request.Body;                mail.ReplyTo = new MailAddress(request.From);                mail.IsBodyHtml = true;                if (request.Attachments != null && request.Attachments.Length > 0)                {                    for (int i = 0; i < request.Attachments.Length; i++)                    {                        Attachment mailAttach = new Attachment(ByteArrayToStream(request.Attachments[i].FileData), request.Attachments[i].FileName);                        mail.Attachments.Add(mailAttach);                    }                }                if (string.IsNullOrEmpty(WebConfigurationManager.AppSettings["SMTPSERVER"]))                {                    throw new ApplicationException("邮件服务无效");                }                //Smtp Server                SmtpClient mailClient = new SmtpClient(WebConfigurationManager.AppSettings["SMTPSERVER"]);                if (!string.IsNullOrEmpty(WebConfigurationManager.AppSettings["SMTPSERVERPORT"]))                {                    //端口号                    try                    {                        mailClient.Port = Int32.Parse(WebConfigurationManager.AppSettings["SMTPSERVERPORT"]);                    }                    catch                    {                        return "SMTP服务器端口设置错误，端口必须设置为数值型";                    }                }                if (!string.IsNullOrEmpty(WebConfigurationManager.AppSettings["MAILUSER"]))                {                    mailClient.Credentials = new System.Net.NetworkCredential(WebConfigurationManager.AppSettings["MAILUSER"], WebConfigurationManager.AppSettings["MAILUSERPW"]);                    mailClient.DeliveryMethod = SmtpDeliveryMethod.Network;                }                else                {                    mailClient.Credentials = CredentialCache.DefaultNetworkCredentials;                }                mailClient.Send(mail);                mail.Dispose();                return string.Empty;            }            catch (SmtpFailedRecipientsException e)            {                Logger.Write("无法发送邮件到所有邮件地址");                Logger.Write(e);                return e.Message;            }            catch (SmtpFailedRecipientException e)            {                Logger.Write("无法发送邮件到个别邮件地址");                Logger.Write(e);                return e.Message;            }            catch (SmtpException e)            {                Logger.Write("发送邮件时的Smtp异常");                Logger.Write(e);                return e.Message;            }            catch (Exception e)            {                Logger.Write("发送邮件时的异常");                Logger.Write(e);                return e.Message;            }        }        /// <summary>        /// 解析分解邮件地址        /// </summary>        /// <param name="mailAddress">邮件地址</param>        /// <param name="mailCollection">邮件对象</param>        private static void PaserMailAddress(string mailAddress, MailAddressCollection mailCollection)        {            if (string.IsNullOrEmpty(mailAddress))            {                return;            }            char[] separator = new char[2] { ‘,‘, ‘;‘ };            string[] addressArray = mailAddress.Split(separator);            foreach (string address in addressArray)            {                if (address.Trim() == string.Empty)                {                    continue;                }                mailCollection.Add(new MailAddress(address));            }        }        /// <summary>        /// 字节数组转换为流        /// </summary>        /// <param name="byteArray">字节数组</param>        /// <returns>Stream</returns>        private static Stream ByteArrayToStream(byte[] byteArray)        {            MemoryStream mstream = new MemoryStream(byteArray);            return mstream;        }    }    #endregion

using System;using System.Reflection;using System.Net.Mail;using System.Web.Configuration;using System.Net;using System.IO;

 <add key="SMTPSERVER" value=http://www.mamicode.com/"邮件服务器"/> <add key="MAILUSER" value=http://www.mamicode.com/"账号"/> <add key="MAILUSERPW" value=http://www.mamicode.com/"密码"/>