C# 发送邮件通知

web.config
   <!-- 配置发邮件：邮件访问登录地址-->
    <add key="HttpsUrl" value="http://localhost:3334/Frame/Login.aspx" />
    <add key="IsSendMail" value="" />
  <!--qq邮箱-->
    <add key="MailUser" value="xxcc@qq.com" />
    <add key="MailName" value="邮件通知" />
    <add key="MailHost" value="smtp.qq.com" />
    <add key="HostPort" value="" />
 <!-- qq邮箱码-->
     <add key="MailPwd" value="测试自己邮箱密码" /> 

  公共方法 ConfigHelper

  public class ConfigHelper
    {
        /// <summary>
        /// 根据Key取Value值
        /// </summary>
        /// <param name="key"></param>
        public static string GetValue(string key)
        {
            return ConfigurationManager.AppSettings[key].ToString().Trim();
        }

        /// <summary>
        /// 根据Key修改Value
        /// </summary>
        /// <param name="key">要修改的Key</param>
        /// <param name="value">要修改为的值</param>
        public static void SetValue(string key, string value)
        {
            System.Xml.XmlDocument xDoc = new System.Xml.XmlDocument();
            xDoc.Load(HttpContext.Current.Server.MapPath("/XmlConfig/Config.xml"));
            System.Xml.XmlNode xNode;
            System.Xml.XmlElement xElem1;
            System.Xml.XmlElement xElem2;
            xNode = xDoc.SelectSingleNode("//appSettings");

            xElem1 = (System.Xml.XmlElement)xNode.SelectSingleNode("//add[@key='" + key + "']");
            if (xElem1 != null) xElem1.SetAttribute("value", value);
            else
            {
                xElem2 = xDoc.CreateElement("add");
                xElem2.SetAttribute("key", key);
                xElem2.SetAttribute("value", value);
                xNode.AppendChild(xElem2);
            }
            xDoc.Save(HttpContext.Current.Server.MapPath("/XmlConfig/Config.xml"));
        }

        /// <summary>
        /// 修改web.config的配置值
        /// </summary>
        /// <param name="key"></param>
        /// <param name="value"></param>
        public static void SetWebConfigValue(string key, string value) {
            Configuration objConfig = WebConfigurationManager.OpenWebConfiguration("~");

              AppSettingsSection objAppSettings = (AppSettingsSection)objConfig.GetSection("appSettings");
              if (objAppSettings != null) {
                  //删除name，然后添加新值
                  objAppSettings.Settings.Remove(key);
                  objAppSettings.Settings.Add(key, value);

                  //保存配置文件
                  objConfig.Save();
              }

        }
    }

   发送邮件
    /// <summary>
    /// 发送邮件
    /// </summary>
    public class SMTPManager
    {
        public static string MailUser = ConfigHelper.GetValue("MailUser");
        public static string MailName = ConfigHelper.GetValue("MailName");
        public static string MailHost = ConfigHelper.GetValue("MailHost");
        public static string MailPwd = ConfigHelper.GetValue("MailPwd");
        public static string IsSendMail = ConfigHelper.GetValue("IsSendMail");
        public static string HostPort = ConfigHelper.GetValue("HostPort");
        public static string EnableSsl = ConfigHelper.GetValue("EnableSsl");
        /// <summary>
        /// 发送邮件
        /// </summary>
        /// <param name="  sender">发送人、支持发送多个人每个地址用 ; 号隔开</param>
        /// <param name="Name">名称</param>
        /// <param name="Describe">内容</param>
        /// <param name="File_Path">附件</param>
        /// <returns></returns>
        public static bool MailSending(string Sender, string Name, string Describe, string File_Path)
        {
            if(IsSendMail !="")
            {
                return false;
            }
            try
            {
                MailAddress from = new MailAddress(MailUser, MailName); //邮件的发件人
                MailMessage mail = new MailMessage();

                //设置邮件图片
                AlternateView htmlBody = AlternateView.CreateAlternateViewFromString(Describe, null, "text/html");
                LinkedResource lrImage = new LinkedResource(AppDomain.CurrentDomain.BaseDirectory + "/Themes/Images/"+ConfigHelper.GetValue("EmailPhoto"), "image/gif");
                lrImage.ContentId = "webimg"; //此处的ContentId 对应 htmlBodyContent 内容中的 cid: ，如果设置不正确，请不会显示图片
                htmlBody.LinkedResources.Add(lrImage);
                mail.AlternateViews.Add(htmlBody);

                //设置邮件的标题
                mail.Subject = Name;//任务名称

                //设置邮件的发件人
                //Pass:如果不想显示自己的邮箱地址，这里可以填符合mail格式的任意名称，真正发mail的用户不在这里设定，这个仅仅只做显示用
                mail.From = from;

                //设置邮件的收件人
                string address = "";
                string displayName = "";
                /**/
                /*  这里这样写是因为可能发给多个联系人，每个地址用 ; 号隔开
                一般从地址簿中直接选择联系人的时候格式都会是 ：用户名1 < mail1 >; 用户名2 < mail 2>;
                因此就有了下面一段逻辑不太好的代码
                如果永远都只需要发给一个收件人那么就简单了 mail.To.Add("收件人mail");
                */
                string[] mailNames = (Sender + ";").Split(';');
                foreach (string name in mailNames)
                {
                    if (name != string.Empty)
                    {
                        if (name.IndexOf('<') > )
                        {
                            displayName = name.Substring(, name.IndexOf('<'));
                            address = name.Substring(name.IndexOf('<') + ).Replace('>', ' ');
                        }
                        else
                        {
                            displayName = string.Empty;
                            address = name.Substring(name.IndexOf('<') + ).Replace('>', ' ');
                        }
                        mail.To.Add(new MailAddress(address, displayName));
                    }
                }

                //设置邮件的抄送收件人
                //这个就简单多了，如果不想快点下岗重要文件还是CC一份给领导比较好
                //mail.CC.Add(new MailAddress("Manage@hotmail.com", "尊敬的领导");

                //设置邮件的内容
                mail.Body = FormatDescribe(Describe);
                //设置邮件的格式
                mail.BodyEncoding = System.Text.Encoding.UTF8;
                mail.IsBodyHtml = true;
                //设置邮件的发送级别
                mail.Priority = MailPriority.Normal;

                //设置邮件的附件，将在客户端选择的附件先上传到服务器保存一个，然后加入到mail中
                if (File_Path != "")
                {
                    mail.Attachments.Add(new Attachment(File_Path));
                    mail.DeliveryNotificationOptions = DeliveryNotificationOptions.OnSuccess;
                } SmtpClient client = new SmtpClient();
                //设置用于 SMTP 事务的主机的名称，填IP地址也可以了
                client.Host = MailHost;
                //设置用于 SMTP 事务的端口，默认的是 25
                client.Port = int.Parse(HostPort);
                client.EnableSsl = EnableSsl == "" ? true : false;
                client.UseDefaultCredentials = false;
                //这里才是真正的邮箱登陆名和密码， 用户名为 MailUser  密码是 MailPwd
                string strMailPwd = MailPwd;
                client.Credentials = new System.Net.NetworkCredential(MailUser, strMailPwd.Trim());
                client.DeliveryMethod = SmtpDeliveryMethod.Network;

                ////如果发送失败，SMTP 服务器将发送 失败邮件
                mail.DeliveryNotificationOptions = DeliveryNotificationOptions.OnFailure;

                //都定义完了，正式发送了
                client.Send(mail);
                return true;
            }
            catch (Exception ex)
            {
                 throw new Exception(ex.Message);
            }
        }

        /// <summary>
        /// 格式化邮件内容
        /// </summary>
        /// <param name="Describe"></param>
        /// <returns></returns>
        public static string FormatDescribe(string Describe)
        {
            StringBuilder sb = new StringBuilder();
            sb.Append("<table cellSpacing=0 cellPadding=0 width=100% border=1>");

            sb.Append("<tr>");
            sb.Append("<td bgColor=#ffffff colSpan=4 height=25>【管理系统】</td>");
            sb.Append("</tr>");

            sb.Append("<TR>");
            sb.Append("<TD align=right width=9% bgColor=#eef7ff height=25>主 题</TD>");
            sb.Append("<TD id=title bgColor=#ffffff colSpan=3><FONT face=宋体>");
            sb.Append("管理邮件通知");
            sb.Append("</FONT></TD>");
            sb.Append("</TR>");

            sb.Append("<TR>");
            sb.Append("<TD align=right width=9% bgColor=#eef7ff height=250>内容</TD>");
            sb.Append("<TD id=title bgColor=#ffffff colSpan=3><FONT face=宋体>");
            sb.Append(Describe);
            sb.Append("</FONT></TD>");
            sb.Append("</TR>");
            sb.Append("</table>");

            return sb.ToString();
        }

        /// <summary>
        /// 发送电子邮件
        /// </summary>
        /// <param name="smtpserver">SMTP服务器</param>
        /// <param name="userName">登录帐号</param>
        /// <param name="pwd">登录密码</param>
        /// <param name="nickName">发件人昵称</param>
        /// <param name="strfrom">发件人</param>
        /// <param name="strto">收件人</param>
        /// <param name="subj">主题</param>
        /// <param name="bodys">内容</param>
        public static void SendMail(string smtpserver, string userName, string pwd, string nickName, string strfrom, string strto, string subj, string bodys)
        {
            try
            {
                SmtpClient _smtpClient = new SmtpClient();
                _smtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;//指定电子邮件发送方式
                _smtpClient.Host = smtpserver;//指定SMTP服务器
                _smtpClient.Credentials = new System.Net.NetworkCredential(userName, pwd);//用户名和密码

                //MailMessage _mailMessage = new MailMessage(strfrom, strto);
                MailAddress _from = new MailAddress(strfrom, nickName);
                MailAddress _to = new MailAddress(strto);
                MailMessage _mailMessage = new MailMessage(_from, _to);
                _mailMessage.Subject = subj;//主题
                _mailMessage.Body = bodys;//内容
                _mailMessage.BodyEncoding = System.Text.Encoding.Default;//正文编码
                _mailMessage.IsBodyHtml = true;//设置为HTML格式
                _mailMessage.Priority = MailPriority.Normal;//优先级
                _smtpClient.Send(_mailMessage);
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message);
            }
        }

}