DS7/DSWeb/Areas/MvcShipping/DAL/BillCheckOut/BillCheckOutDAL.cs

using System;
using System.Data;
using System.Collections.Generic;
using System.Text;
using DSWeb.Common.DB;
using System.Linq;
using DSWeb.MvcShipping.Helper;
using DSWeb.Common.Helper;
using DSWeb.Areas.CommMng.Models;
using static DSWeb.Areas.CommMng.DAL.BasicDataRefDAL;
using DSWeb.EntityDA;
using Microsoft.Practices.EnterpriseLibrary.Data;
using DSWeb.Areas.CommMng.DAL;
using HcUtility.Comm;
using System.Web.Mvc;
using DSWeb.MvcShipping.DAL.DsSendmail;
using iTextSharp.text.pdf;
using iTextSharp.text;
using System.IO;
using sun.swing;
using DSWeb.Areas.Import.DAL.ReceiptDoc;
using DSWeb.Areas.SysMng.DAL.SysUser;
using Renci.SshNet.Common;
using DSWeb.MvcShipping.DAL.MsSeaeOrderDAL;
using System.Data.Entity.Migrations;
using Aspose.Words.Saving;
using System.Web;
using DSWeb.MvcShipping.DAL.MsSysBillNoSet;
using DSWeb.Areas.MvcShipping.Helper;
using MailKit.Security;
using MimeKit;
using System.Net.Mime;
using Aspose.Cells.Charts;
using System.Net.Mail;
using DSWeb.Areas.MvcShipping.DAL.MsOp_BLISSUE;
using System.Web.UI.WebControls;

namespace DSWeb.MvcShipping.DAL.BillCheckOut
{
    public class BillCheckOutDAL
    {


        public static List<BillCheckOut_md> GetDataList(int start, int limit, string sort, string strCondition,string userid,string username, string companyid, ref int count)
        {
            var rangstr = GetRangDAStr("index", userid, username, companyid);

            var strSql = new StringBuilder();
            strSql.Append(" select * from ");
            strSql.Append(" BillCheckOut where 1=1 ");

            var sortstring = DatasetSort.Getsortstring(sort);


            PagedQuaryParam pp = new PagedQuaryParam();

            pp.strSql = strSql.ToString();
            pp.start = start;
            pp.limit = limit;
            pp.strCondition = strCondition;
            pp.defaultsortstr = "CREATETIME desc";
            pp.sortstring = sortstring;
            pp.rangestr = rangstr;

            var result = PagedQuaryStr(pp);

            count = PagedCount(pp);

            return SetData(result);
        }

        public static List<VW_BillCheckOut_Detail_md> GetBodyList(string LINKGID)
        {
            var cdc = new CommonDataContext();


            var dataList = cdc.VW_BillCheckOut_Detail.Where(x=>x.LINKGID== LINKGID).ToList();

            //var count = dataList.Count();

            //var list = dataList.Skip(start).Take(limit).ToList();

            return dataList;
        }

        public static string GetRangDAStr(string tb, string userid, string username, string companyid)
        {
            string str = "";
            var strSql = new StringBuilder();
            strSql.Append("SELECT ");
            strSql.Append(" VISIBLERANGE,OPERATERANGE,AUTHORITYID,VSSQL ");
            strSql.Append("  from VW_User_Authority ");
            strSql.Append("  where [NAME]='modBillCheckOut' and USERID='" + userid + "' and ISDELETE=0");

            string visiblerange = "4";
            string operaterange = "4";
            string AUTHORITYID = "";
            string VSSQL = "";

            Database db = DatabaseFactory.CreateDatabase();


            using (IDataReader reader = db.ExecuteReader(CommandType.Text, strSql.ToString()))
            {

                while (reader.Read())
                {
                    visiblerange = Convert.ToString(reader["VISIBLERANGE"]);
                    operaterange = Convert.ToString(reader["OPERATERANGE"]);
                    AUTHORITYID = Convert.ToString(reader["AUTHORITYID"]);
                    VSSQL = Convert.ToString(reader["VSSQL"]);
                    break;
                }
                reader.Close();
            }
            if (visiblerange == "4")
            {
                str = "1=2";
            }
            else if (visiblerange == "3")
            {

                str = " (INPUTBY='" + username + "' OR SENDER='" + username + "' OR CHECKOUTUSER='" + username + "' )";

            }
            else if (visiblerange == "2")
            {
                if (tb == "index")
                {
                    var rangeDa = new RangeDA();
                    var deptid = rangeDa.GetDEPTGID(userid);

                    str = $" exists(select 1 from vw_user where deptgid='{deptid}' and SHOWNAME in(INPUTBY,SENDER,CHECKOUTUSER)) ";

                }
                else
                {
                    str = " (UPPER(CORPID)='" + companyid + "' or SALECORPID='" + companyid + "') ";
                }

            }
            else if (visiblerange == "5")
            {
                if (tb == "index")
                {
                    var userstr = new StringBuilder();
                    userstr.Append(" select COMPANYID from user_authority_range_company where userid='" + userid + "' and AUTHORITYID='" + AUTHORITYID + "' and VISIBLERANGE=1");
                    Database userdb = DatabaseFactory.CreateDatabase();
                    using (IDataReader reader = userdb.ExecuteReader(CommandType.Text, userstr.ToString()))
                    {
                        str = "";
                        while (reader.Read())
                        {
                            if (str == "")
                            {
                                str = " (CORPID='" + Convert.ToString(reader["COMPANYID"]) + "' or SALECORPID='" + Convert.ToString(reader["COMPANYID"]) + "' ";
                            }
                            else
                            {
                                str = str + " or CORPID='" + Convert.ToString(reader["COMPANYID"]) + "' or SALECORPID='" + Convert.ToString(reader["COMPANYID"]) + "'";
                            };
                        }
                        str = str + ")";
                        reader.Close();
                    }
                }
                else
                {
                    str = " (UPPER(CORPID)='" + companyid + "' or SALECORPID='" + companyid + "') ";
                }

            }
            else if (visiblerange == "6")
            {
                if (tb == "index")
                {
                    
                    str = " EXISTS (select 1 from user_authority_range_op P left join [user] u on (u.GID=P.OPID) where (INPUTBY=U.SHOWNAME OR SENDER=U.SHOWNAME OR CHECKOUTUSER=U.SHOWNAME )  AND  P.userid='" + userid + "' and P.AUTHORITYID='" + AUTHORITYID + "' and P.VISIBLERANGE=1) ";



                }
                else
                {
                    str = " (UPPER(CORPID)='" + companyid + "' or SALECORPID='" + companyid + "') ";
                }

            }
            else if (visiblerange == "1")
            {
                str = " (UPPER(B.Corpid)='" + companyid + "' or B.SALECORPID='" + companyid + "') ";
            }
            VSSQL = VSSQL.Trim();
            if (!string.IsNullOrEmpty(VSSQL))
            {

                if (!string.IsNullOrEmpty(str))
                {
                    str = str + " and (" + VSSQL + ") ";
                }
                else
                {
                    str = " (" + VSSQL + ") ";
                }

            }

            return str;
        }

        private static List<BillCheckOut_md> SetData(StringBuilder strSql, bool isNoForward = false)
        {
            var headList = new List<BillCheckOut_md>();
            Database db = DatabaseFactory.CreateDatabase();
            using (IDataReader reader = db.ExecuteReader(CommandType.Text, strSql.ToString()))
            {
                while (reader.Read())
                {
                    BillCheckOut_md data = new BillCheckOut_md();
                    #region Set DB data to Object


                    data.GID = Convert.ToString(reader["GID"]);
                    data.CHECKOUTNO = Convert.ToString(reader["CHECKOUTNO"]);
                    data.CUSTOMERNAME = Convert.ToString(reader["CUSTOMERNAME"]);
                    data.CORPID = Convert.ToString(reader["CORPID"]);
                    data.SALECORPID = Convert.ToString(reader["SALECORPID"]);
                    data.INPUTBY = Convert.ToString(reader["INPUTBY"]);
                    if (reader["CREATETIME"] != DBNull.Value)
                        data.CREATETIME = Convert.ToDateTime(reader["CREATETIME"]);
                    data.MODIFIER = Convert.ToString(reader["MODIFIER"]);
                    if (reader["MODIFYTIME"] != DBNull.Value)
                        data.MODIFYTIME = Convert.ToDateTime(reader["MODIFYTIME"]);
                    //if (reader["SENDED"] != DBNull.Value)
                    //    data.SENDED = Convert.ToBoolean(reader["SENDED"]);
                    data.SENDED =(bool) getValue(reader, "SENDED");
                    data.SENDER = Convert.ToString(reader["SENDER"]);
                    if (reader["SENDTIME"] != DBNull.Value)
                        data.SENDTIME = Convert.ToDateTime(reader["SENDTIME"]);
                    data.RECEIVER = Convert.ToString(reader["RECEIVER"]);
                    data.RECEIVEEMAIL = Convert.ToString(reader["RECEIVEEMAIL"]);
                    data.SENDEREMAIL = Convert.ToString(reader["SENDEREMAIL"]);
                    //if (reader["ISCHECKOUT"] != DBNull.Value)
                    //    data.ISCHECKOUT = Convert.ToBoolean(reader["ISCHECKOUT"]);
                    data.ISCHECKOUT = (bool)getValue(reader, "ISCHECKOUT");
                    if (reader["CHECKOUTTIME"] != DBNull.Value)
                        data.CHECKOUTTIME = Convert.ToDateTime(reader["CHECKOUTTIME"]);

                    data.CHECKOUTUSER = Convert.ToString(reader["CHECKOUTUSER"]);
                    data.MAILPDFURL = Convert.ToString(reader["MAILPDFURL"]);
                    data.SIGNPDFURL = Convert.ToString(reader["SIGNPDFURL"]);
                    #endregion
                    headList.Add(data);
                }
                reader.Close();
            }
            return headList;
        }

        public static DBResult DoSave(string opstatus, string data, string SHOWNAME, string companyid) {

            var result = new DBResult();
            try {
                var cdc = new CommonDataContext();
                var headData = JsonConvert.Deserialize<BillCheckOut_md>(data);

                if (headData == null) headData=new BillCheckOut_md();

                if (headData.SENDED == null) headData.SENDED = false;
                if (headData.ISCHECKOUT == null) headData.ISCHECKOUT = false;

                if (opstatus == "add")
                {
                    headData.GID = Guid.NewGuid().ToString();
                    headData.INPUTBY = SHOWNAME;
                    headData.CORPID= companyid;

                    var billnoset = MsSysBillNoSetDAL.GetData("OPLBNAME='签单管理'", companyid);
                    if (billnoset.BILLTYPE != "")
                        headData.CHECKOUTNO = MsSysBillNoSetDAL.GetBillNo(billnoset, headData.INPUTBY.ToString().Trim(), headData.INPUTBY.ToString().Trim());
                    else {
                        result.SetErrorInfo("未配置命名规则【签单管理】");
                        return result;
                    }
                    //headData.CHECKOUTNO = PubSysDAL.GetBillNo("0311");
                    cdc.BillCheckOut.Add(headData);
                }
                else if (opstatus == "edit")
                {
                    var oldheaddata = cdc.BillCheckOut.First(x => x.GID == headData.GID);
                    oldheaddata = AutoMapperHelper.MapTo<BillCheckOut_md, BillCheckOut_md>(headData);
                    cdc.BillCheckOut.AddOrUpdate(oldheaddata);
                }

                //设定sended ischange默认值
                

                cdc.SaveChanges();
                headData = cdc.BillCheckOut.FirstOrDefault(x => x.GID == headData.GID);

                result.OK("保存成功", headData);
            } catch (Exception e) { 
            
                result.SetErrorInfo(e.Message); 
            }
            return result;
        }

        #region 通知签单
        /// <summary>
        /// 向客户发出签单条
        /// </summary>
        /// <param name="BSNOs"></param>
        /// <returns></returns>
        public static DBResult NoticeCustomerToCheckOut(string BSNOs,string path,string username)
        {
            var result = new DBResult();

            var gidList= BSNOs.Split(',').ToList();

            var cdc = new CommonDataContext();

            var headList = cdc.BillCheckOut.Where(x => gidList.Contains(x.GID)).ToList();

            foreach (var item in headList) {

                var cansend = CanSend(item);
                if (!cansend.Success) return cansend;
                
            }

            var customernames = headList.Select(s => s.CUSTOMERNAME).ToList();
            var 客户账期和欠费 = cdc.V_CUSTOMER_NODR.Where(x => customernames.Contains(x.CUSTOMERNAME)).ToList();

            DBResult 判断能否发邮件(BillCheckOut_md head) {
                var _result = new DBResult();

                var 客户info = cdc.info_client.FirstOrDefault(x => x.SHORTNAME == head.CUSTOMERNAME);

                if (客户info.ISSP == true) {
                    return _result.OK();
                }
                
                if (客户账期和欠费.Exists(x => x.CUSTOMERNAME == head.CUSTOMERNAME))
                {
                    
                    var zq= 客户账期和欠费.First(x => x.CUSTOMERNAME == head.CUSTOMERNAME);

                    var bsnolist = cdc.BillCheckOut_Detail.Where(x => x.LINKGID == head.GID).Select(s => s.BSNO).ToList();
                    var billgainList = cdc.v_op_bill_gain.Where(x => bsnolist.Contains(x.PARENTID)).ToList();

                    if (zq.ACCTYPE == "票结")
                    {//看这些业务欠费没有

                        if (billgainList.Exists(x => x.TTLNODR > 0))
                        {

                            var 特放通过 = true;
                            foreach (var item in billgainList.Where(x => x.TTLNODR > 0))
                            {

                                var _r = BasicDataRefDAL.特放审批通过(item.BSNO);

                                if (!_r.Success)
                                {
                                    _result.SetErrorInfo(item.MBLNO);
                                    _result.setMessage2(item.BSNO);
                                    特放通过 = false;
                                    //break;
                                }
                            }
                            if (特放通过) return _result.OK();

                            return _result;
                        }
                        else {
                            return _result.OK();
                        }
                    }
                    else
                    //if (zq.ACCTYPE == "月结")
                    {
                        if (zq.CQTTLNODR > 0)
                        {

                            var 特放通过 = true;
                            foreach (var item in billgainList)
                            {

                                var _r = BasicDataRefDAL.特放审批通过(item.BSNO);

                                if (!_r.Success)
                                {
                                    _result.SetErrorInfo(item.MBLNO);
                                    _result.setMessage2(item.BSNO);
                                    特放通过 = false;
                                }
                            }
                            if (特放通过) return _result.OK();

                            return _result;
                        }
                        else {
                            return _result.OK();
                        }
                    }
                    return _result;
                }
                else {
                    //_result = false;
                    _result.SetErrorInfo("");
                }
                return _result;
            }
            var nosendCust = new List<string>();

            var cansendemail = new DBResult();
            foreach (var item in headList)
            {
                //20230608 判断客户是否欠费
                //如月结 看是否有超期欠费
                //如票结 看是否该票欠费

                //如有 则不发邮件
                cansendemail = 判断能否发邮件(item);
                if (!cansendemail.Success) {
                    if (nosendCust.Exists(x => x == item.CUSTOMERNAME))
                    {

                    }
                    else {
                        nosendCust.Add(item.CUSTOMERNAME);
                    }
                }

                var _r= DoSendMail(item,path, cansendemail.Success);
                if (_r.Success)
                {
                    item.SENDED = cansendemail.Success;
                    item.SENDTIME = DateTime.Now;
                    item.SENDER = username;
                }
                else {
                    return _r;
                }
            }
            cdc.SaveChanges();
            result.OK("生成和发送签单条成功。");
            if (nosendCust!=null && nosendCust.Count>0) {
                var custstr = string.Join( ",",nosendCust);
                result.Message=$"以下客户由于欠费原因没有发送邮件【{custstr}】，业务号【{cansendemail.Message}】，要填写特殊放单申请吗？";
                result.Data = cansendemail.Message2;
            }
            return result;
        }

        public static DBResult SaveSignPdf(string GID, string Base64Str, string path, string username) { 
            var result = new DBResult();

            try
            {
                var cdc = new CommonDataContext();

                var head = cdc.BillCheckOut.FirstOrDefault(x => x.GID == GID);

                byte[] bytes = Convert.FromBase64String(Base64Str);

                string location = path+"/"+ head.CHECKOUTNO + "_Sign.pdf";

                head.SIGNPDFURL = location;

                if (File.Exists(location))
                {
                    File.Delete(location);
                }

                System.IO.FileStream stream = new FileStream(location, FileMode.CreateNew);
                System.IO.BinaryWriter writer = new BinaryWriter(stream);
                writer.Write(bytes, 0, bytes.Length);
                writer.Close();

                head.ISCHECKOUT = true;
                head.CHECKOUTUSER=username;
                head.CHECKOUTTIME=DateTime.Now;
                
                //head.SIGNPDFURL = location;
                cdc.BillCheckOut.AddOrUpdate(head);
                cdc.SaveChanges();

                //var BodyList = cdc.BillCheckOut_Detail.Where(x => x.LINKGID == GID).ToList();
                //var BsnoList = BodyList.Select(s => s.BSNO).ToList();
                //var condition = "b.bsno in('"+string.Join(",", BsnoList) +"')";
                //var _recordcount = 0;
                //var blissuedataList  = MsOp_BLISSUEDAL.GetDataList(condition, 0, 999, out _recordcount, "");

                //var QCResult = MsOp_BLISSUEDAL.QC(blissuedataList, username, "签单条签字签出", DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"), username);
                var QCResult = DoQC(GID, username);
                result.OK(head.SIGNPDFURL);
            }
            catch (Exception e) {
                result.SetErrorInfo(e.Message);
            }

            return result;
        
        }

        public static DBResult DoQC(string GID,string username) {
            var cdc = new CommonDataContext();
            var BodyList = cdc.BillCheckOut_Detail.Where(x => x.LINKGID == GID).ToList();
            var BsnoList = BodyList.Select(s => s.BSNO).ToList();
            var condition = "b.bsno in('" + string.Join("','", BsnoList) + "')";
            var _recordcount = 0;
            var blissuedataList = MsOp_BLISSUEDAL.GetDataList(condition, 0, 999, out _recordcount, "");

            var QCResult = MsOp_BLISSUEDAL.QC(blissuedataList, username, "签单条签字签出", DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"), username);
            return QCResult;
        }
        public static DBResult CanSend(BillCheckOut_md head) { 
            var result = new DBResult();
            result.OK();
            if (string.IsNullOrWhiteSpace(head.RECEIVEEMAIL)) {
                result.SetErrorInfo("未指定收件人邮箱");
            }


            return result;
        }

        public static DBResult DoSendMail(BillCheckOut_md head, string path,bool dosend=true)
        {
            var result = new DBResult();
            //1根据业务的明细 生成一个pdf

            result=MakeCheckOutPdf( head, path);

            if (!result.Success) return result;

            var filename = result.Message;

            //2作为附件发出
            if (dosend)
            {
                result = SendCheckOutEmail(head, path);
            }


            return result;
        }

        public static DBResult MakeCheckOutPdf(BillCheckOut_md head, string path) {
            var result = new DBResult();

            //读取基本dpf 在其中增加内容
            PDFHelper ph = new PDFHelper();

            result = ph.MakePdf_BillCheckOut(head, path);

            return result;
        }

        public static DBResult SendCheckOutEmail(BillCheckOut_md head,string path)
        {
            var cdc = new CommonDataContext();
            var result = new DBResult(true, "");
            try
            {
                head = cdc.BillCheckOut.FirstOrDefault(x => x.GID == head.GID);
                var detailList = cdc.VW_BillCheckOut_Detail.Where(x => x.LINKGID == head.GID).ToList();
                var mblnoList = detailList.Select(s => s.MBLNO).ToList();
                var mblnostr = string.Join(",", mblnoList);
                if (mblnostr.Length > 50) {
                    mblnostr = mblnostr.Substring(0, 50) + "...等";
                }

                var mailtitle = mblnostr+" 领单申请";

                var Body = new StringBuilder();
                Body.Append("<html> <Body>");
                Body.Append("<br />尊敬的客户:<br />您的提单已经生成，请携带领单申请书签单，谢谢！");
                //Body.Append("<br />客户名称：" + headData.CUSTOMERNAME);
                //Body.Append("<br />揽货人" + headData.SALE);
                //Body.Append("<br />录入人" + headData.INPUTBY);
                //Body.Append("<br />港口：" + headData.DESTINATION);
                //Body.Append("<br />船期：" + headData.ETD);
                //Body.Append("<br />船公司：" + headData.CARRIER);
                //Body.Append("<br />箱量：" + headData.CNTRTOTAL);
                //Body.Append("<br />备注：" + OrderData.REMARK);
                Body.Append("</Body></html> ");
                var mailto = head.RECEIVEEMAIL;
                //var oplist = SysUserDAL.GetDataList("U.SHOWNAME='" + op + "' or U.SHOWNAME='" + headData.SALE + "' or U.SHOWNAME='" + OrderData.INPUTBY + "' ");
                //foreach (var opbs in oplist)
                //{
                //    if (opbs.EMAIL1 != "")
                //    {
                //        if (mailto == "")
                //            mailto = opbs.EMAIL1;
                //        else
                //            mailto = mailto + ";" + opbs.EMAIL1;
                //    }
                //}

                //if (mailto != "")
                //{
                //    var j = 0;
                //    var filepath = "";
                //    var doclist = ReceiptDocDAL.GetDocList("BSNO='" + headData.BSNO + "'", " MODIFIEDTIME DESC ");
                //    foreach (var doc in doclist)
                //    {
                //        if (j == 0)
                //        {
                //            filepath = doc.Driect_URL;
                //        }

                //        j = j = 1;
                //    }

                //    result = MsSeaeOrderDAL.SendMailWithFile(mailtitle, Body.ToString(), filepath, mailto, Convert.ToString(Session["SHOWNAME"]));
                //}

                //20230328 首先trycatch删除 head.MAILPDFURL_*的文件
                //然后复制一个head.MAILPDFURL文件，至head.MAILPDFURL_yyyyMMddHHmm.pdf


                //DirectoryInfo direction = new DirectoryInfo(filepath);
                //var allfilename = head.MAILPDFURL.Replace(".pdf", "_*");
                //FileInfo[] files= direction.GetFiles(allfilename,SearchOption.AllDirectories);
                //if (files != null && files.Length > 0) {
                //    for (int i = 0; i < files.Length; i++)
                //    {
                //        try {
                //            File.Delete(files[i].FullName);
                //        }
                //        catch(Exception ex)
                //        {

                //        }
                //    }
                //}

                var filedic = GetLogicInfo(head.GID, "filename");
                var upddic = new Dictionary<string,string>();
                if (filedic!=null && filedic.Count>0)
                foreach (var item in filedic) {

                    if (item.Value == "1") {
                        try
                        {
                            File.Delete(path+"/" + item.Key);
                            upddic.Add(item.Key, "0");
                        }
                        catch(Exception ex)
                        {

                        }
                        
                    }
                }
                


                string sourceFile = path+"/" + head.CHECKOUTNO+".pdf";
                string filelastname = DateTime.Now.ToString("yyyyMMddHHmmss") + ".pdf";
                string destinationFile = sourceFile.Replace(".pdf","_") + filelastname ;
                //记录复制的附件到
                if (System.IO.File.Exists(sourceFile))
                {
                    // true is overwrite 
                    System.IO.File.Copy(sourceFile, destinationFile, true);
                }

                upddic.Add(head.CHECKOUTNO + "_" + filelastname , "1");

                SaveLogicInfo(head.GID, "filename", upddic);

                //var sendpath = destinationFile.Replace(path, "../../UploadFiles/MailFile");

                SendEmail se = new SendEmail(mailto, head.SENDER, "", "", mailtitle, Body.ToString(), true);
                se.Attachments(destinationFile);
                se.SetSmtp();
                

                result.OK("发送成功");
            }
            catch (Exception e)
            {
                result.Success = false;
                result.Message = e.Message;
                BasicDataRefDAL.SaveLog(e.Message, "", "签单条邮件", "发送错误");
            }


            return result;
        }


        public class BillCheckOutEmail
        {
            Multipart multipart = new Multipart("mixed");
            /// <summary>
            /// 添加文件
            /// </summary>
            /// <param name="file"></param>
            /// <param name="name"></param>
            public bool AddFile(string file, string name)
            {
                if (!System.IO.File.Exists(file))
                {
                    return false;
                }
                try
                {
                    System.IO.FileStream fs = new System.IO.FileStream(file, System.IO.FileMode.Open, System.IO.FileAccess.Read, System.IO.FileShare.ReadWrite);

                    //附件
                    var attimg = new MimePart(MediaTypeNames.Application.Octet)
                    {
                        Content = new MimeContent(fs, ContentEncoding.Default),
                        ContentDisposition = new MimeKit.ContentDisposition(MimeKit.ContentDisposition.Attachment),
                        ContentTransferEncoding = ContentEncoding.Default,
                        FileName = name,
                        IsAttachment = true,
                    };
                    multipart.Add(attimg);
                    return true;
                }
                catch (Exception ex)
                {
                    return false;
                }
            }

            /// <summary>
            /// 发送
            /// </summary>
            /// <param name="subject">主题</param>
            /// <param name="from">发送人</param>
            /// <param name="to">接收人</param>
            /// <param name="html">邮件内容支持html</param>
            /// <returns></returns>
            public string Send(string subject, string from, string to, string html)
            {
                using (var smtp = new MailKit.Net.Smtp.SmtpClient())
                {
                    MimeMessage mail = new MimeMessage();
                    mail.From.Add(new MailboxAddress("Yuan天空", from));
                    mail.To.Add(new MailboxAddress(to, to));
                    mail.Subject = subject;
                    if (string.IsNullOrEmpty(html))
                    {
                        return "发送内容不能为空";
                    }

                    var Html = new TextPart(MimeKit.Text.TextFormat.Html)
                    {
                        Text = html
                    };
                    multipart.Add(Html);
                    mail.Body = multipart;

                    smtp.ServerCertificateValidationCallback = (s, c, h, e) => true;
                    //连接邮箱服务器 
                    //!!!需要注意的是阿里云服务器默认是禁止25端口的,安全组添加也不行需要提交阿里云审核才能开通 ,  这里使用587端口是可以发送的(服务器实测发送延迟很高 ,本地调试发送挺快, 不知道是不是服务器配置比较低的原因)
                    smtp.Connect("smtp.qq.com", 587, SecureSocketOptions.None);
                    //登录认证 qq邮箱账号和授权密钥
                    smtp.Authenticate("xxxx@qq.com", "xxxx");
                    smtp.Timeout = 600000;
                    string res = "";
                    smtp.Send(mail);
                    smtp.Disconnect(true);
                    return res;
                }
            }
        }
        #endregion
    }
}