Aspose.Email.Imap 使用

Apsose.Mail.Imap方式收取邮件

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目前为止找到的比较好用的邮件组件，支持对exhcange服务器上的邮件阅读状态的保存

 public class ImapStyle
    {
        /// <summary>
        /// 存储单个账户的邮件信息
        /// </summary>
        private List<MailInLocal> AllMail = new List<MailInLocal>();
        /// <summary>
        /// 归档根目录
        /// </summary>
        private const string InbOx = "INBOX";
        /// <summary>
        /// 
        /// </summary>
        /// <param name="serverAddr">服务器地址</param>
        /// <param name="port">端口</param>
        /// <param name="mailAddr">邮件帐号地址</param>
        /// <param name="pswd">邮件帐号密码</param>
        /// <param name="laseAchineTime">上次归档时间</param>
        public void GetEmails(string serverAddr, int port, string mailAddr, string pswd, DateTime laseAchineTime)
        {
            try
            {
                AllMail.Clear();
                using (var client = new ImapClient())
                {
                    //port = 993;
                    client.Port = port;
                    client.Host = serverAddr;
                    client.Username = mailAddr;
                    client.Password = pswd;
                    //client.SecurityMode = ImapSslSecurityMode.Implicit;
                    //client.EnableSsl = true;

                    client.Connect();
                    client.Login();
                    client.SelectFolder(InbOx);
                    LoadMails(client, InbOx, laseAchineTime);
                    var folders = client.ListFolders(InbOx);
                    Utility.WriteLog(string.Format("收件箱下的子目录数:{0} ", folders.Count));
                    foreach (var folder in folders)
                    {
                        LoadMails(client, folder.Name, laseAchineTime);
                    }
                }
            }
            catch (Exception e)
            {
                Utility.WriteLog(string.Format("归档邮箱:{0}失败，异常信息:{1} ", mailAddr, e));
            }
        }


        /// <summary>
        /// load账户邮件信息
        /// </summary>
        /// <param name="client">imapclient</param>
        /// <param name="folderName">收件箱里文件夹名称</param>
        /// <param name="laseAchineTime">上次归档时间</param>
        private void LoadMails(ImapClient client, string folderName, DateTime laseAchineTime)
        {
            client.SelectFolder(folderName);

            var list = client.ListMessages();
            var ls = list.OrderByDescending(mail => mail.Date);


            Utility.WriteLog(string.Format("开始归档目录:{0},当前目录总的邮件数目:{1}", folderName, list.Count));
            foreach (var eachItem in ls)
            {
                #region exchnage,支持 阅读状态
                var isRead = client.ListMessage(eachItem.UniqueId).IsRead;
                var msg = client.FetchMessage(eachItem.UniqueId);

                if (!isRead)
                    client.ChangeMessageFlags(eachItem.UniqueId, ImapMessageFlags.Recent);
                #endregion

                #region 163等，不维持阅读状态
                // var msg = client.FetchMessage(eachItem.UniqueId);
                #endregion


                var to = msg.To.Aggregate("", (current, item) => current + (item.Address + ";"));

                var cc = "";
                if (msg.CC != null)
                    cc = msg.CC.Aggregate(cc, (current, item) => current + (item.Address + ";"));

                var mail = new MailInLocal
                {
                    MailId = msg.MessageId,
                    Refrence = FilterReferences(msg.Headers.Get("References")),
                    From = msg.From.DisplayName,
                    FormAddr = msg.From.Address,
                    ToRecipients = to,
                    CcRecipients = cc,
                    MailSubject = msg.Subject
                };

                mail.MailSubject = FilterString(mail.MailSubject);
                mail.SendTime = msg.Date.AddHours(8);//utc 时间 +8
                Utility.WriteLog(string.Format("文件夹 {0} 下符的邮件:{1}，发送时间:{2} ,是否归档：{3} ", folderName, mail.MailSubject, mail.SendTime, mail.SendTime >= laseAchineTime));
                //上次归档前的不再归档
                if (mail.SendTime < laseAchineTime)
                    return;

                var id = mail.MailId == null ? "" : mail.MailId.Replace("<", "").Replace(">", "").Split('@')[0];
                var path = AppDomain.CurrentDomain.BaseDirectory + "MailArchiveTemp\\" + mail.MailSubject + id + ".eml";

                Utility.WriteLog(string.Format("文件夹 {0} 下符符合条件的邮件:{1} ", folderName, path));
                var dir = Path.GetDirectoryName(path);

                if (!Directory.Exists(dir))
                {
                    Directory.CreateDirectory(dir);
                }
                if (!File.Exists(path))
                    msg.Save(path);
                mail.MailPath = path;
                AllMail.Add(mail);
            }
        }

        /// <summary>
        /// 按照时间先后顺序排序
        /// </summary>
        /// <returns></returns>
        public List<MailInLocal> MailListInOrder()
        {
            var reult = from item in AllMail orderby item.SendTime select item;
            return reult.ToList();
        }

        /// <summary>
        /// 过滤命名规则不允许的字符
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        private static string FilterString(string str)
        {
            return str
                 .Replace("\\", "")
                 .Replace("/", "")
                 .Replace(":", "")
                .Replace("?", "")
                .Replace("\"", "")
                .Replace("=", "")
                .Replace("<", "")
                .Replace(">", "")
                .Replace("*", "")
                 .Replace("：", "")
                .Replace("|", "").Trim()
                ;
        }

        /// <summary>
        /// 过滤邮件的引用id，只保留原始引用
        /// </summary>
        /// <param name="refStr">引用字符串</param>
        /// <returns></returns>
        private static string FilterReferences(string refStr)
        {
            if (string.IsNullOrEmpty(refStr))
                return refStr;

            return refStr.Split(',')[0];
        }
    }