基于Lumisoft.NET组件，使用IMAP协议收取邮件

        /// <summary>
        ///收取邮件操作/// </summary>
        public voidReceive()

        {using (var client = newIMAP_Client())

            {//创建日志处理
                client.Logger = newLogger();

                client.Logger.WriteLog+= new EventHandler<WriteLogEventArgs>(WriteLog);//响应记录显示//使用账号密码，连接服务器
client.Connect(server, port, useSsl);//登录获取授权操作
client.Login(username, password);//var identity = client.AuthenticatedUserIdentity;//获取各个邮箱目录的概要信息
                client.GetFolders(null).ToList().ForEach(f =>{



                    Console.WriteLine(f.FolderName);var s =client.FolderStatus(f.FolderName);

                    s.ToList().ForEach(sIt=>{

                        Console.WriteLine("总数:{0},未读:{1},最近{2}", sIt.MessagesCount, sIt.MessagesCount, sIt.UnseenCount);

                    });



                });

    //选择邮箱
    client.SelectFolder("INBOX");//首先确定取第x到第n封邮件，"1:*"表示第1封到最后一封
    var seqSet = IMAP_t_SeqSet.Parse("1:*");var items = newIMAP_t_Fetch_i[]

    {new IMAP_t_Fetch_i_Envelope(),  //邮件的标题、正文等信息
        new IMAP_t_Fetch_i_Uid(),       //返回邮件的UID号，UID号是唯一标识邮件的一个号码
        new IMAP_t_Fetch_i_Flags(),     //此邮件的标志，应该是已读未读标志
        new IMAP_t_Fetch_i_InternalDate(),//貌似是收到的日期
        new IMAP_t_Fetch_i_Rfc822()     //Rfc822是标准的邮件数据流，可以通过Lumisoft.Net.Mail.Mail_Message对象解析出邮件的所有信息
    };

    //Fetch 第一个参数false时seqSet有效
    client.Fetch(false, seqSet, items, (s, e) =>{//处理邮件的匿名函数内容
    });

   var email = e.Value asIMAP_r_u_Fetch;if (email.Rfc822 != null)

    {

        email.Rfc822.Stream.Position= 0;var mime_message =Mail_Message.ParseFromStream(email.Rfc822.Stream);

        email.Rfc822.Stream.Close();

    receiveInfo.ReceivedDate = DateTime.Now;//接收本地时间
    receiveInfo.Company_ID = this.companyId;

    receiveInfo.User_ID= this.userId;

    receiveInfo.Email= this.email;//接收Email账号
    receiveInfo.MailConfig_ID = this.mailConfig_ID;//接收Email账号的配置记录ID//每封Email会有一个在Pop3服务器范围内唯一的Id,检查这个Id是否存在就可以知道以前有没有接收过这封邮件
    receiveInfo.MailUid =email.UID.UID.ToString();try{//可能会出现【LumiSoft.Net.ParseException: Header field 'Date' parsing failed】异常错误。
        receiveInfo.SendDate =mime_message.Date;

    }catch(Exception ex)

    {

        receiveInfo.SendDate= Convert.ToDateTime("1900-1-1");//错误赋值一个日期
        error = string.Format("转换邮件的Date出错:账号{0} 邮件标题：{1}", username, mime_message.Subject);

        LogTextHelper.Error(error, ex);

    }//可能出现乱码问题，通过函数进行转换
    receiveInfo.Title = mime_message.Subject;//DecodeString(mime_header.Subject);
receiveInfo.MailBody=mime_message.BodyText;try{if (!string.IsNullOrEmpty(mime_message.BodyHtmlText))

        {

            receiveInfo.MailBody=mime_message.BodyHtmlText;

        }

    }catch{//屏蔽编码出现错误的问题，错误在BodyText存在而BodyHtmlText不存在的时候，访问BodyHtmlText会出现
    }

    #region 写入邮件信息到数据库
    int mailId = -1;try{

        mailId= BLLFactory<MailReceive>.Instance.Insert2(receiveInfo);

    }catch(Exception ex)

    {

        error= string.Format("写入邮件信息到数据库出错:账号{0}  邮件标题：{1}", username, mime_message.Subject);

        LogTextHelper.Error(error, ex);

    }if (mailId <= 0) return; //如果邮件没有保存，不要保存附件
    #endregion

    #region 邮件附件内容
    foreach (var entity in mime_message.GetAttachments(true, true))

    {string fileName = "";#region 判断是普通附件还是嵌入的内容附件
        if (entity.ContentDisposition != null &&entity.ContentDisposition.DispositionType==MIME_DispositionTypes.Attachment)

        {

            Console.WriteLine("Attachment:" +entity.ContentDisposition.Param_FileName);

            fileName=entity.ContentDisposition.Param_FileName;

        }else{string cid = entity.ContentID.Substring(1, entity.ContentID.Length - 2);if (entity.ContentType.Param_Name != null &&mime_message.BodyHtmlText.Contains(string.Format("cid:{0}", cid)))

            {

                Console.WriteLine("Embeded image:" +cid);

                fileName=cid;

            }else{

                Console.WriteLine("Unknown attachment.");

            }

        }

 var byteObj = entity.Body as MIME_b_SinglepartBase;

File.WriteAllBytes(filename, byteObj.Data);