63 lines
2.2 KiB
C#
63 lines
2.2 KiB
C#
|
using GiftShopFileImplement.Models;
|
|||
|
|
using System;
|
|||
|
|
using System.Collections.Generic;
|
|||
|
|
using System.Linq;
|
|||
|
|
using System.Text;
|
|||
|
|
using System.Threading.Tasks;
|
|||
|
|
using System.Xml.Linq;
|
|||
|
|
|
|||
|
|
namespace GiftShopFileImplement
|
|||
|
|
{
|
|||
|
|
public class DataFileSingleton
|
|||
|
|
{
|
|||
|
|
private static DataFileSingleton? instance;
|
|||
|
|
private readonly string ComponentFileName = "Component.xml";
|
|||
|
|
private readonly string OrderFileName = "Order.xml";
|
|||
|
|
private readonly string GiftFileName = "Gift.xml";
|
|||
|
|
public List<Component> Components { get; private set; }
|
|||
|
|
public List<Order> Orders { get; private set; }
|
|||
|
|
public List<Gift> Gifts { get; private set; }
|
|||
|
|
public static DataFileSingleton GetInstance()
|
|||
|
|
{
|
|||
|
|
if (instance == null)
|
|||
|
|
{
|
|||
|
|
instance = new DataFileSingleton();
|
|||
|
|
}
|
|||
|
|
return instance;
|
|||
|
|
}
|
|||
|
|
public void SaveComponents() => SaveData(Components, ComponentFileName,
|
|||
|
|
"Components", x => x.GetXElement);
|
|||
|
|
public void SaveGifts() => SaveData(Gifts, GiftFileName,
|
|||
|
|
"Gifts", x => x.GetXElement);
|
|||
|
|
public void SaveOrders() => SaveData(Orders, OrderFileName, "Orders", x
|
|||
|
|
=> x.GetXElement);
|
|||
|
|
private DataFileSingleton()
|
|||
|
|
{
|
|||
|
|
Components = LoadData(ComponentFileName, "Component", x =>
|
|||
|
|
Component.Create(x)!)!;
|
|||
|
|
Gifts = LoadData(GiftFileName, "Gift", x =>
|
|||
|
|
Gift.Create(x)!)!;
|
|||
|
|
Orders = LoadData(OrderFileName, "Order", x => Order.Create(x)!)!;
|
|||
|
|
}
|
|||
|
|
private static List<T>? LoadData<T>(string filename, string xmlNodeName,
|
|||
|
|
Func<XElement, T> selectFunction)
|
|||
|
|
{
|
|||
|
|
if (File.Exists(filename))
|
|||
|
|
{
|
|||
|
|
return
|
|||
|
|
XDocument.Load(filename)?.Root?.Elements(xmlNodeName)?.Select(selectFunction)?.ToList();
|
|||
|
|
}
|
|||
|
|
return new List<T>();
|
|||
|
|
}
|
|||
|
|
private static void SaveData<T>(List<T> data, string filename, string
|
|||
|
|
xmlNodeName, Func<T, XElement> selectFunction)
|
|||
|
|
{
|
|||
|
|
if (data != null)
|
|||
|
|
{
|
|||
|
|
new XDocument(new XElement(xmlNodeName,
|
|||
|
|
data.Select(selectFunction).ToArray())).Save(filename);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
}
|