58 lines
2.2 KiB
C#
58 lines
2.2 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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using TravelCompanyFileImplement.Models;
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using System.Xml.Linq;
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using System.ComponentModel;
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namespace TravelCompanyFileImplement
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{
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public class DataFileSingleton
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{
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private static DataFileSingleton? instance;
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private readonly string ConditionFileName = "Condition.xml";
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private readonly string OrderFileName = "Order.xml";
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private readonly string ProductFileName = "Product.xml";
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public List<Condition> Conditions { get; private set; }
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public List<Order> Orders { get; private set; }
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public List<Travel> Travels { get; private set; }
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public static DataFileSingleton GetInstance()
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{
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if (instance == null)
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{
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instance = new DataFileSingleton();
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}
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return instance;
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}
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public void SaveConditions() => SaveData(Conditions, ConditionFileName,"Conditions", x => x.GetXElement);
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public void SaveTravels() => SaveData(Travels, ProductFileName, "Travels", x => x.GetXElement);
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public void SaveOrders() => SaveData(Orders, OrderFileName, "Orders", x => x.GetXElement);
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private DataFileSingleton()
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{
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Conditions = LoadData(ConditionFileName, "Condition", x => Condition.Create(x)!)!;
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Travels = LoadData(ProductFileName, "Travel", x => Travel.Create(x)!)!;
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Orders = LoadData(OrderFileName, "Order", x => Order.Create(x)!)!;
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}
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private static List<T>? LoadData<T>(string filename, string xmlNodeName,
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Func<XElement, T> selectFunction)
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{
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if (File.Exists(filename))
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{
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return
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XDocument.Load(filename)?.Root?.Elements(xmlNodeName)?.Select(selectFunction)?.ToList();
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}
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return new List<T>();
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}
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private static void SaveData<T>(List<T> data, string filename, string xmlNodeName, Func<T, XElement> selectFunction)
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{
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if (data != null)
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{
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new XDocument(new XElement(xmlNodeName,
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data.Select(selectFunction).ToArray())).Save(filename);
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}
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}
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}
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}
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