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;
}
}
}