XML新增、修改、选择

using System;

using System.Linq;

using System.Xml.Linq;

using DFS.Kiosk.Provider.Simulator.Common.Utilities;

using DFS.Kiosk.Provider.Simulators.Utilities;



namespace DFS.Kiosk.Provider.Simulator.Common.Data

{

    public static class DataAccessor

    {

        private static readonly object ReadWriteLock = new object();



        private static XDocument _doc;



        private const string XmlFileName = "Data/ValidTickets.xml";



        private static XDocument Doc

        {

            get { return _doc ?? (_doc = XDocument.Load(XmlFileName)); }

        }



        public static string ReadTicket(string ticketNumber, TicketStatus ticketstatus)

        {

            try

            {

                lock (ReadWriteLock)

                {

                    XElement element = (from elem in Doc.Elements().Descendants()

                        where elem.Value == ticketNumber && elem.Attribute("status").Value == ticketstatus.ToString()

                        select elem).FirstOrDefault();

                    return element != null ? element.Attribute("amount").Value : "0";

                }

            }

            catch (Exception ex)

            {

                Logger.WriteLogger(ex, ConstValues.MainLogFileName);

            }

            return "0";

        }



        public static string ReadKonamiTicket(string ticketNumber, TicketStatus ticketstatus)

        {

            try

            {

                lock (ReadWriteLock)

                {

                    XElement element = (from elem in Doc.Elements().Descendants()

                                        where elem.Value.Substring(2,16) == ticketNumber && elem.Attribute("status").Value == ticketstatus.ToString()

                                        select elem).FirstOrDefault();

                    return element != null ? element.Attribute("amount").Value : "0";

                }

            }

            catch (Exception ex)

            {

                Logger.WriteLogger(ex, ConstValues.MainLogFileName);

            }

            return "0";

        }



        public static string ReadTicket(string ticketNumber, string attribute)

        {

            try

            {

                lock (ReadWriteLock)

                {

                    XElement element =

                        (from elem in Doc.Elements().Descendants() where elem.Value == ticketNumber select elem)

                            .FirstOrDefault();

                    if (attribute == "status")

                    {

                        return element != null ? element.Attribute("status").Value : TicketStatus.NotFound.ToString();

                    }

                    if (attribute == "amount")

                    {

                        return element != null ? element.Attribute("amount").Value : "0";

                    }

                }

            }

            catch (Exception ex)

            {

                Logger.WriteLogger(ex, ConstValues.MainLogFileName);

            }

            return "0";

        }



        public static bool WriteTicket(string ticketNumber, TicketStatus oldStatus, TicketStatus newStatus)

        {

            try

            {

                lock (ReadWriteLock)

                {

                    XElement element = (from elem in Doc.Elements().Descendants()

                        where elem.Value == ticketNumber && elem.Attribute("status").Value == oldStatus.ToString()

                        select elem).FirstOrDefault();

                    if (element != null)

                    {

                        element.Attribute("status").Value = newStatus.ToString();

                        return true;

                    }

                    return false;

                }

            }

            catch (Exception ex)

            {

                Logger.WriteLogger(ex, ConstValues.MainLogFileName);

                return false;

            }

        }



        public static bool WriteKonamiTicket(string ticketNumber, TicketStatus oldStatus, TicketStatus newStatus)

        {

            try

            {

                lock (ReadWriteLock)

                {

                    XElement element = (from elem in Doc.Elements().Descendants()

                                        where elem.Value.Substring(2,16) == ticketNumber && elem.Attribute("status").Value == oldStatus.ToString()

                                        select elem).FirstOrDefault();

                    if (element != null)

                    {

                        element.Attribute("status").Value = newStatus.ToString();

                        return true;

                    }

                    return false;

                }

            }

            catch (Exception ex)

            {

                Logger.WriteLogger(ex, ConstValues.MainLogFileName);

                return false;

            }

        }





        /// <summary>

        ///     Creates ticket, add xml node into ValidTickets.xml file

        /// </summary>

        /// <param name="amount">The amount.</param>

        /// <returns></returns>

        public static string CreateTicket(string amount)

        {

            try

            {

                lock (ReadWriteLock)

                {

                    XElement lastTiket = Doc.Elements().Descendants().Last();

                    string number = (long.Parse(lastTiket.Value) + 1).ToString();



                    //if number.lenght<18 fill with "0" at start

                    while (number.Length < 18)

                    {

                        number = "0" + number;

                    }

                    //get 18 character in case number.lengh>18

                    string ticketNumber = number.Substring(number.Length - 18, 18);



                    //add new ticket to xdocoment

                    var newNode = new XElement("ValidVoucher",

                        new XAttribute("status", TicketStatus.pending),

                        new XAttribute("amount", amount));

                    newNode.SetValue(ticketNumber);

                    if (Doc.Root != null) Doc.Root.Add(newNode);



                    return ticketNumber;

                }

            }

            catch (Exception ex)

            {

                Logger.WriteLogger(ex, ConstValues.MainLogFileName);

                return "000000000000000000";

            }

        }



        public static bool Reset()

        {

            try

            {

                lock (ReadWriteLock)

                {

                    _doc = XDocument.Load(XmlFileName);

                }

            }

            catch (Exception ex)

            {

                Logger.WriteLogger(ex, ConstValues.MainLogFileName);

                return false;

            }

            return true;

        }

    }

}