C#发邮件类-带附件功能

//======================================================================
//
//        系统名称: 站内短信系统
//        命名空间名称: ST.SiteMessages
//        文件名: sm_Email.cs
//        创建者: 章 sontin[#]qq.com
//        创建时间: 2010-10-18 16:06:48
//        电子邮件:
//        备注：邮件发送类,使用是务必在web.config设置发送方属性节点
//
//======================================================================
using System;
using System.Net;
using System.Net.Mail;
using System.Configuration;
using System.Collections;
//using System.Net.Mime;  //发送附件使用,MediaTypeNames对象

namespace ST.SiteMessages
{
    /// <summary>
    /// 功能：邮件发送类
    /// 创建人： 章
    /// 创建时间： 2010-10-18 16:13
    /// 修改人：
    /// 修改时间：
    /// 修改内容：
    /// </summary>
    public class sm_Email
    {
        /// <summary>
        /// 判断是否正确的邮箱格式
        /// </summary>
        /// <param name="str_Email">邮箱地址</param>
        /// <returns>bool</returns>
        public static bool IsEmail(string str_Email)
        {
            return System.Text.RegularExpressions.Regex.IsMatch(str_Email, @"^([\w-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([\w-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$");
        }
        /// <summary>
        /// 发送邮件,只发送一个邮箱。返回string[发送完成 或 错误信息]
        /// </summary>
        /// <param name="mailTo">收信人地址</param>
        /// <param name="subject">邮件标题</param>
        /// <param name="body">邮件内容</param>
        /// <param name="bodyHTML">内容格式:false为Text,true为Html</param>
        /// <param name="priority">优先级:0为低,1为中,2为高</param>
        /// <returns>string</returns>
        public static string SendEmail(string mailTo, string subject, string body, bool bodyHTML, int priority)
        {
            if (!IsEmail(mailTo))
            {
                return "邮箱地址格式不正确。";
            }
            ArrayList toEmail = new ArrayList();
            toEmail.Add(mailTo);
            return sm_Email.SendEmail(toEmail, subject, body, bodyHTML, priority);
        }

        /// <summary>
        /// 发送邮件,同时发送多个邮箱。返回string[发送完成 或 错误信息]
        /// </summary>
        /// <param name="mailTo">收信人地址ArrayList数组</param>
        /// <param name="subject">邮件标题</param>
        /// <param name="body">邮件内容</param>
        /// <param name="bodyHTML">内容格式:false为Text,true为Html</param>
        /// <param name="priority">优先级:0为低,1为中,2为高</param>
        /// <returns>string</returns>
        public static string SendEmail(System.Collections.ArrayList mailTo, string subject, string body, bool bodyHTML, int priority)
        {
            string errEmail = "";

            string smtp = ConfigurationManager.AppSettings["SM_Email_Smtp"].ToString();         //发信人所用邮箱的服务器
            string mailUser = ConfigurationManager.AppSettings["SM_Email_UserName"].ToString();     //发件人的用户名
            string mailPwd = ConfigurationManager.AppSettings["SM_Email_PassWord"].ToString();      //发件人的密码

            string mailTrueName = ConfigurationManager.AppSettings["SM_Email_TrueName"].ToString(); //发件人的姓名
            string mailForm = ConfigurationManager.AppSettings["SM_Email_FromAddress"].ToString();     //发件人的邮箱

            System.Net.Mail.MailMessage msg = new System.Net.Mail.MailMessage();
            foreach (object item in mailTo)
            {
                if (!IsEmail(item.ToString()))
                {
                    errEmail += item.ToString() + "<br />";
                }
                else
                {
                    msg.To.Add(item.ToString());
                }
            }

            msg.From = new MailAddress(mailForm, mailTrueName, System.Text.Encoding.UTF8);
            /* 上面3个参数分别是发件人地址（可以随便写），发件人姓名，编码*/
            msg.Subject = subject;
            msg.SubjectEncoding = System.Text.Encoding.UTF8;
            msg.Body = body;
            msg.BodyEncoding = System.Text.Encoding.UTF8;
            msg.IsBodyHtml = bodyHTML;  //是否是HTML邮件
            //邮件优先级
            if (priority == 0)
                msg.Priority = MailPriority.Low;
            else if (priority == 1)
                msg.Priority = MailPriority.Normal;
            else
                msg.Priority = MailPriority.High;
              

            //string file = @"E:\1.txt";
            //Attachment data = new Attachment(file, MediaTypeNames.Application.Octet);
            //msg.Attachments.Add(data);

            //创建Smtp Mail对象
            SmtpClient smtpClient = new SmtpClient();
            smtpClient.UseDefaultCredentials = false;   //要在下一行之前,否则无法登录服务器
            smtpClient.Credentials = new NetworkCredential(mailUser, mailPwd);
            smtpClient.Port = 25;
            smtpClient.Host = smtp;
            smtpClient.EnableSsl = false;
            smtpClient.DeliveryMethod = SmtpDeliveryMethod.Network; //指定如何处理待发的邮件

            //smtpClient.SendCompleted += new SendCompletedEventHandler(SendMailCompleted);
            try
            {
                //smtpClient.SendAsync(msg, msg);
                smtpClient.Send(msg);
                string rval = "发送完成";
                if (errEmail != "")
                    rval += "<hr /><strong>以下邮箱地址格式有问题：</strong><br />" + errEmail;
                return rval;
            }
            catch (SmtpException ex)
            {
                return ex.ToString();
            }
        }

        #region ==异步方法==
        //private static void SendMailCompleted(object sender, System.ComponentModel.AsyncCompletedEventArgs e)
        //{
        //    MailMessage mailMsg = (MailMessage)e.UserState;
        //    string subject = mailMsg.Subject;
        //    if (e.Cancelled) // 邮件被取消
        //    {
        //        return subject + " 被取消。";
        //    }

        //    if (e.Error != null)
        //    {
        //       return "错误：" + e.Error.ToString();
        //    }
        //    else
        //    {
        //        return "发送完成。[邮件已发出，请检查是否有退信。]";
        //    }
        //}
        #endregion
    }
}