List<string> list = new List<string>();
            list = File.ReadAllLines(@"C:\Windows\Eado.ini").ToList().Where(x => !string.IsNullOrEmpty(x)).ToList();
            List<string> listdns = new List<string>(); //0,5,10
            List<string> listNICKNAME = new List<string>(); //1,6,11
            List<string> listFIRSTNAME = new List<string>();  //2,7,12
            List<string> listLASTNAME = new List<string>();   //3,8,13
            List<string> listSINGILECONNECTION = new List<string>(); //4,9,14 
            for (int i = 0; i < list.Count; i++)//等差数列算法
            {
                if (i % 5 == 0) listdns.Add(list[i].Replace("[","").Replace("]","").Trim());
                else if (i % 5 == 1) listNICKNAME.Add(list[i].Replace("NICKNAME", "").Replace("=", "").Trim());
                else if (i  % 5 == 2) listFIRSTNAME.Add(list[i].Replace("FIRSTNAME", "").Replace("=", "").Trim());
                else if (i  % 5 == 3) listLASTNAME.Add(list[i].Replace("LASTNAME", "").Replace("=", "").Trim());
                else if (i % 5 == 4) listSINGILECONNECTION.Add(list[i].Replace("SINGILECONNECTION", "").Replace("=", "").Trim());
            }
            List<FileModel> listFile = new List<FileModel>();
            for (int i = 0; i < listdns.Count; i++)
            {
                listFile.Add(new FileModel() {
                    dns = listdns[i],NICKNAME =listNICKNAME[i],FIRSTNAME=listNICKNAME[i], LASTNAME=listLASTNAME[i],
                    SINGILECONNECTION =listSINGILECONNECTION[i] });
            }
            return listFile.Where(x => x.dns.ToUpper().Equals("DEFAULT")).ToList().FirstOrDefault().NICKNAME;