11 changed files with 591 additions and 4 deletions
--- a/Confectionery/Confectionery.sln
+++ b/Confectionery/Confectionery.sln
@ -7,11 +7,13 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Confectionery", "Confection
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "ConfectioneryDataModels", "ConfectioneryDataModels\ConfectioneryDataModels.csproj", "{22A053DC-3DC2-4375-9563-BF647A1092A4}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ConfectioneryContracts", "ConfectioneryContracts\ConfectioneryContracts.csproj", "{6C4950D1-D788-4D5A-8C15-0A376274F2DD}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "ConfectioneryContracts", "ConfectioneryContracts\ConfectioneryContracts.csproj", "{6C4950D1-D788-4D5A-8C15-0A376274F2DD}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ConfectioneryBusinessLogic", "ConfectioneryBusinessLogic\ConfectioneryBusinessLogic.csproj", "{30F4AE5A-2C90-4C7F-BBE9-2FA56BE26C63}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "ConfectioneryBusinessLogic", "ConfectioneryBusinessLogic\ConfectioneryBusinessLogic.csproj", "{30F4AE5A-2C90-4C7F-BBE9-2FA56BE26C63}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ConfectioneryListImplement", "ConfectioneryListImplement\ConfectioneryListImplement.csproj", "{85992074-656D-4F79-AB23-60DE4F9ABF30}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "ConfectioneryListImplement", "ConfectioneryListImplement\ConfectioneryListImplement.csproj", "{85992074-656D-4F79-AB23-60DE4F9ABF30}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ConfectioneryFileImplement", "ConfectioneryFileImplements\ConfectioneryFileImplement.csproj", "{48A8592F-EF58-4FC4-9C9E-B401836FF21E}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
@ -39,6 +41,10 @@ Global
 		{85992074-656D-4F79-AB23-60DE4F9ABF30}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{85992074-656D-4F79-AB23-60DE4F9ABF30}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{85992074-656D-4F79-AB23-60DE4F9ABF30}.Release|Any CPU.Build.0 = Release|Any CPU
+		{48A8592F-EF58-4FC4-9C9E-B401836FF21E}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{48A8592F-EF58-4FC4-9C9E-B401836FF21E}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{48A8592F-EF58-4FC4-9C9E-B401836FF21E}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{48A8592F-EF58-4FC4-9C9E-B401836FF21E}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
--- a/Confectionery/Confectionery/Confectionery.csproj
+++ b/Confectionery/Confectionery/Confectionery.csproj
@ -31,6 +31,7 @@
    <ProjectReference Include="..\ConfectioneryBusinessLogic\ConfectioneryBusinessLogic.csproj" />
    <ProjectReference Include="..\ConfectioneryContracts\ConfectioneryContracts.csproj" />
    <ProjectReference Include="..\ConfectioneryDataModels\ConfectioneryDataModels.csproj" />
+    <ProjectReference Include="..\ConfectioneryFileImplements\ConfectioneryFileImplement.csproj" />
    <ProjectReference Include="..\ConfectioneryListImplement\ConfectioneryListImplement.csproj" />
  </ItemGroup>

--- a/Confectionery/Confectionery/Program.cs
+++ b/Confectionery/Confectionery/Program.cs
@ -1,7 +1,7 @@
 using ConfectioneryBusinessLogic.BusinessLogics;
 using ConfectioneryContracts.BusinessLogicsContracts;
 using ConfectioneryContracts.StoragesContracts;
-using ConfectioneryListImplement.Implements;
+using ConfectioneryFileImplement.Implements;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Logging;
 using NLog.Extensions.Logging;
--- a/Confectionery/ConfectioneryFileImplements/ConfectioneryFileImplement.csproj
+++ b/Confectionery/ConfectioneryFileImplements/ConfectioneryFileImplement.csproj
@ -0,0 +1,14 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\ConfectioneryContracts\ConfectioneryContracts.csproj" />
+    <ProjectReference Include="..\ConfectioneryDataModels\ConfectioneryDataModels.csproj" />
+  </ItemGroup>
+
+</Project>
--- a/Confectionery/ConfectioneryFileImplements/DataFileSingleton.cs
+++ b/Confectionery/ConfectioneryFileImplements/DataFileSingleton.cs
@ -0,0 +1,54 @@
+using ConfectioneryFileImplement.Models;
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Xml.Linq;
+
+namespace ConfectioneryFileImplement
+{
+    public class DataFileSingleton
+    {
+        private static DataFileSingleton? instance;
+        private readonly string IngredientFileName = "Ingredient.xml";
+        private readonly string OrderFileName = "Order.xml";
+        private readonly string PastryFileName = "Pastry.xml";
+        public List<Ingredient> Ingredients { get; private set; }
+        public List<Order> Orders { get; private set; }
+        public List<Pastry> Pastries { get; private set; }
+        public static DataFileSingleton GetInstance()
+        {
+            if (instance == null)
+            {
+                instance = new DataFileSingleton();
+            }
+            return instance;
+        }
+        public void SaveIngredients() => SaveData(Ingredients, IngredientFileName, "Ingredients", x => x.GetXElement);
+        public void SavePastries() => SaveData(Pastries, PastryFileName, "Pastries", x => x.GetXElement);
+        public void SaveOrders() => SaveData(Orders, OrderFileName, "Orders", x => x.GetXElement);
+        private DataFileSingleton()
+        {
+            Ingredients = LoadData(IngredientFileName, "Ingredient", x => Ingredient.Create(x)!)!;
+            Pastries = LoadData(PastryFileName, "Pastry", x => Pastry.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);
+            }
+        }
+    }
+}
--- a/Confectionery/ConfectioneryFileImplements/Implements/IngredientStorage.cs
+++ b/Confectionery/ConfectioneryFileImplements/Implements/IngredientStorage.cs
@ -0,0 +1,86 @@
+using ConfectioneryContracts.BindingModels;
+using ConfectioneryContracts.SearchModels;
+using ConfectioneryContracts.StoragesContracts;
+using ConfectioneryContracts.ViewModels;
+using ConfectioneryFileImplement.Models;
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ConfectioneryFileImplement.Implements
+{
+    public class IngredientStorage : IIngredientStorage
+    {
+        private readonly DataFileSingleton source;
+        public IngredientStorage()
+        {
+            source = DataFileSingleton.GetInstance();
+        }
+        public List<IngredientViewModel> GetFullList()
+        {
+            return source.Ingredients
+            .Select(x => x.GetViewModel)
+            .ToList();
+        }
+        public List<IngredientViewModel> GetFilteredList(IngredientSearchModel model)
+        {
+            if (string.IsNullOrEmpty(model.IngredientName))
+            {
+                return new();
+            }
+            return source.Ingredients
+            .Where(x => x.IngredientName.Contains(model.IngredientName))
+            .Select(x => x.GetViewModel)
+            .ToList();
+        }
+        public IngredientViewModel? GetElement(IngredientSearchModel model)
+        {
+            if (string.IsNullOrEmpty(model.IngredientName) && !model.Id.HasValue)
+            {
+                return null;
+            }
+            return source.Ingredients
+            .FirstOrDefault(x => (!string.IsNullOrEmpty(model.IngredientName) && x.IngredientName == model.IngredientName) ||
+            (model.Id.HasValue && x.Id == model.Id))
+            ?.GetViewModel;
+        }
+
+        public IngredientViewModel? Insert(IngredientBindingModel model)
+        {
+            model.Id = source.Ingredients.Count > 0 ? source.Ingredients.Max(x => x.Id) + 1 : 1;
+            var newIngredient = Ingredient.Create(model);
+            if (newIngredient == null)
+            {
+                return null;
+            }
+            source.Ingredients.Add(newIngredient);
+            source.SaveIngredients();
+            return newIngredient.GetViewModel;
+        }
+        public IngredientViewModel? Update(IngredientBindingModel model)
+        {
+            var component = source.Ingredients.FirstOrDefault(x => x.Id == model.Id);
+            if (component == null)
+            {
+                return null;
+            }
+            component.Update(model);
+            source.SaveIngredients();
+            return component.GetViewModel;
+        }
+        public IngredientViewModel? Delete(IngredientBindingModel model)
+        {
+            var element = source.Ingredients.FirstOrDefault(x => x.Id == model.Id);
+            if (element != null)
+            {
+                source.Ingredients.Remove(element);
+                source.SaveIngredients();
+                return element.GetViewModel;
+            }
+            return null;
+        }
+    }
+}
--- a/Confectionery/ConfectioneryFileImplements/Implements/OrderStorage.cs
+++ b/Confectionery/ConfectioneryFileImplements/Implements/OrderStorage.cs
@ -0,0 +1,95 @@
+using ConfectioneryContracts.BindingModels;
+using ConfectioneryContracts.SearchModels;
+using ConfectioneryContracts.StoragesContracts;
+using ConfectioneryContracts.ViewModels;
+using ConfectioneryFileImplement.Models;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ConfectioneryFileImplement.Implements
+{
+    public class OrderStorage : IOrderStorage
+    {
+        private readonly DataFileSingleton source;
+        public OrderStorage()
+        {
+            source = DataFileSingleton.GetInstance();
+        }
+        public List<OrderViewModel> GetFullList()
+        {
+            return source.Orders
+            .Select(x => AccessPastryStorage(x.GetViewModel))
+            .ToList();
+        }
+
+        public List<OrderViewModel> GetFilteredList(OrderSearchModel model)
+        {
+            if (!model.Id.HasValue)
+            {
+                return new();
+            }
+            return source.Orders
+            .Where(x => x.Id == model.Id)
+            .Select(x => AccessPastryStorage(x.GetViewModel))
+            .ToList();
+        }
+
+        public OrderViewModel? GetElement(OrderSearchModel model)
+        {
+            if (!model.Id.HasValue)
+            {
+                return null;
+            }
+            return AccessPastryStorage(source.Orders
+            .FirstOrDefault(x => model.Id.HasValue && x.Id == model.Id)
+            ?.GetViewModel);
+        }
+
+        public OrderViewModel? Insert(OrderBindingModel model)
+        {
+            model.Id = source.Orders.Count > 0 ? source.Orders.Max(x => x.Id) + 1 : 1;
+            var newOrder = Order.Create(model);
+            if (newOrder == null)
+            {
+                return null;
+            }
+            source.Orders.Add(newOrder);
+            source.SaveOrders();
+            return AccessPastryStorage(newOrder.GetViewModel);
+        }
+
+        public OrderViewModel? Update(OrderBindingModel model)
+        {
+            var order = source.Orders.FirstOrDefault(x => x.Id == model.Id);
+            if (order == null)
+            {
+                return null;
+            }
+            order.Update(model);
+            source.SaveOrders();
+            return AccessPastryStorage(order.GetViewModel);
+        }
+
+        public OrderViewModel? Delete(OrderBindingModel model)
+        {
+            var element = source.Orders.FirstOrDefault(x => x.Id == model.Id);
+            if (element != null)
+            {
+                source.Orders.Remove(element);
+                source.SaveOrders();
+                return AccessPastryStorage(element.GetViewModel);
+            }
+            return null;
+        }
+
+        public OrderViewModel AccessPastryStorage(OrderViewModel model)
+        {
+            string? pastryName = source.Pastries.FirstOrDefault(x => x.Id == model?.PastryId)?.PastryName;
+            if (pastryName != null) model.PastryName = pastryName;
+            return model;
+        }
+    }
+}
--- a/Confectionery/ConfectioneryFileImplements/Implements/PastryStorage.cs
+++ b/Confectionery/ConfectioneryFileImplements/Implements/PastryStorage.cs
@ -0,0 +1,89 @@
+using ConfectioneryContracts.BindingModels;
+using ConfectioneryContracts.SearchModels;
+using ConfectioneryContracts.StoragesContracts;
+using ConfectioneryContracts.ViewModels;
+using ConfectioneryFileImplement.Models;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ConfectioneryFileImplement.Implements
+{
+    public class PastryStorage : IPastryStorage
+    {
+        private readonly DataFileSingleton source;
+        public PastryStorage()
+        {
+            source = DataFileSingleton.GetInstance();
+        }
+        public List<PastryViewModel> GetFullList()
+        {
+            return source.Pastries
+            .Select(x => x.GetViewModel)
+            .ToList();
+        }
+
+        public List<PastryViewModel> GetFilteredList(PastrySearchModel model)
+        {
+            if (string.IsNullOrEmpty(model.PastryName))
+            {
+                return new();
+            }
+            return source.Pastries
+            .Where(x => x.PastryName.Contains(model.PastryName))
+            .Select(x => x.GetViewModel)
+            .ToList();
+        }
+
+        public PastryViewModel? GetElement(PastrySearchModel model)
+        {
+            if (string.IsNullOrEmpty(model.PastryName) && !model.Id.HasValue)
+            {
+                return null;
+            }
+            return source.Pastries
+            .FirstOrDefault(x => (!string.IsNullOrEmpty(model.PastryName) && x.PastryName == model.PastryName) ||
+            (model.Id.HasValue && x.Id == model.Id))
+            ?.GetViewModel;
+        }
+
+        public PastryViewModel? Insert(PastryBindingModel model)
+        {
+            model.Id = source.Pastries.Count > 0 ? source.Pastries.Max(x => x.Id) + 1 : 1;
+            var newPastry = Pastry.Create(model);
+            if (newPastry == null)
+            {
+                return null;
+            }
+            source.Pastries.Add(newPastry);
+            source.SavePastries();
+            return newPastry.GetViewModel;
+        }
+
+        public PastryViewModel? Update(PastryBindingModel model)
+        {
+            var pastry = source.Pastries.FirstOrDefault(x => x.Id == model.Id);
+            if (pastry == null)
+            {
+                return null;
+            }
+            pastry.Update(model);
+            source.SavePastries();
+            return pastry.GetViewModel;
+        }
+
+        public PastryViewModel? Delete(PastryBindingModel model)
+        {
+            var element = source.Pastries.FirstOrDefault(x => x.Id == model.Id);
+            if (element != null)
+            {
+                source.Pastries.Remove(element);
+                source.SavePastries();
+                return element.GetViewModel;
+            }
+            return null;
+        }
+    }
+}
--- a/Confectionery/ConfectioneryFileImplements/Models/Ingredient.cs
+++ b/Confectionery/ConfectioneryFileImplements/Models/Ingredient.cs
@ -0,0 +1,62 @@
+using ConfectioneryContracts.BindingModels;
+using ConfectioneryContracts.ViewModels;
+using ConfectioneryDataModels.Models;
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Xml.Linq;
+
+namespace ConfectioneryFileImplement.Models
+{
+    public class Ingredient : IIngredientModel
+    {
+        public int Id { get; private set; }
+        public string IngredientName { get; private set; } = string.Empty;
+        public double Cost { get; set; }
+        public static Ingredient? Create(IngredientBindingModel model)
+        {
+            if (model == null) return null;
+            return new Ingredient()
+            {
+                Id = model.Id,
+                IngredientName = model.IngredientName,
+                Cost = model.Cost
+            };
+        }
+        public static Ingredient? Create(XElement element)
+        {
+            if (element == null)
+            {
+                return null;
+            }
+            return new Ingredient()
+            {
+                Id = Convert.ToInt32(element.Attribute("Id")!.Value),
+                IngredientName = element.Element("IngredientName")!.Value,
+                Cost = Convert.ToDouble(element.Element("Cost")!.Value)
+            };
+        }
+        public void Update(IngredientBindingModel model)
+        {
+            if (model == null)
+            {
+                return;
+            }
+            IngredientName = model.IngredientName;
+            Cost = model.Cost;
+        }
+        public IngredientViewModel GetViewModel => new()
+        {
+            Id = Id,
+            IngredientName = IngredientName,
+            Cost = Cost
+        };
+        public XElement GetXElement => new("Ingredient",
+        new XAttribute("Id", Id),
+        new XElement("IngredientName", IngredientName),
+        new XElement("Cost", Cost.ToString()));
+    }
+}
--- a/Confectionery/ConfectioneryFileImplements/Models/Order.cs
+++ b/Confectionery/ConfectioneryFileImplements/Models/Order.cs
@ -0,0 +1,91 @@
+using ConfectioneryContracts.BindingModels;
+using ConfectioneryContracts.ViewModels;
+using ConfectioneryDataModels.Enums;
+using ConfectioneryDataModels.Models;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Xml.Linq;
+
+namespace ConfectioneryFileImplement.Models
+{
+    public class Order : IOrderModel
+    {
+        public int Id { get; private set; }
+        public int PastryId { get; private set; }
+        public int Count { get; private set; }
+        public double Sum { get; private set; }
+
+        public OrderStatus Status { get; private set; }
+
+        public DateTime DateCreate { get; private set; }
+
+        public DateTime? DateImplement { get; private set; }
+
+        public static Order? Create(OrderBindingModel? model)
+        {
+            if (model == null)
+            {
+                return null;
+            }
+            return new Order()
+            {
+                Id = model.Id,
+                PastryId = model.PastryId,
+                Count = model.Count,
+                Sum = model.Sum,
+                Status = model.Status,
+                DateCreate = model.DateCreate,
+                DateImplement = model.DateImplement
+            };
+        }
+
+        public static Order? Create(XElement element)
+        {
+            if (element == null)
+            {
+                return null;
+            }
+            return new Order()
+            {
+                Id = Convert.ToInt32(element.Attribute("Id")!.Value),
+                PastryId = Convert.ToInt32(element.Element("PastryId")!.Value),
+                Count = Convert.ToInt32(element.Element("Count")!.Value),
+                Sum = Convert.ToDouble(element.Element("Sum")!.Value),
+                Status = (OrderStatus) Convert.ToInt32(element.Element("Status")!.Value),
+                DateCreate = Convert.ToDateTime(element.Element("DateCreate")!.Value),
+                DateImplement = Convert.ToDateTime(String.IsNullOrEmpty(element.Element("DateImplement")!.Value) ? null : element.Element("DateImplement")!.Value)
+            };
+        }
+
+        public void Update(OrderBindingModel model)
+        {
+            if (model == null)
+            {
+                return;
+            }
+            Status = model.Status;
+            if (model.DateImplement.HasValue) DateImplement = model.DateImplement;
+        }
+        public OrderViewModel GetViewModel => new()
+        {
+            Id = Id,
+            PastryId = PastryId,
+            Count = Count,
+            Sum = Sum,
+            Status = Status,
+            DateCreate = DateCreate,
+            DateImplement = DateImplement
+        };
+        public XElement GetXElement => new("Order",
+        new XAttribute("Id", Id),
+        new XElement("PastryId", PastryId),
+        new XElement("Count", Count.ToString()),
+        new XElement("Sum", Sum.ToString()),
+        new XElement("Status", ((int)Status).ToString()),
+        new XElement("DateCreate", DateCreate.ToString()),
+        new XElement("DateImplement", DateImplement.ToString()));
+    }
+}
--- a/Confectionery/ConfectioneryFileImplements/Models/Pastry.cs
+++ b/Confectionery/ConfectioneryFileImplements/Models/Pastry.cs
@ -0,0 +1,89 @@
+using ConfectioneryContracts.BindingModels;
+using ConfectioneryContracts.ViewModels;
+using ConfectioneryDataModels.Models;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Xml.Linq;
+
+namespace ConfectioneryFileImplement.Models
+{
+    public class Pastry
+    {
+        public int Id { get; private set; }
+        public string PastryName { get; private set; } = string.Empty;
+        public double Price { get; private set; }
+        public Dictionary<int, int> Ingredients { get; private set; } = new();
+        private Dictionary<int, (IIngredientModel, int)>? _pastryIngredients = null;
+        public Dictionary<int, (IIngredientModel, int)> PastryIngredients
+        {
+            get
+            {
+                if (_pastryIngredients == null)
+                {
+                    var source = DataFileSingleton.GetInstance();
+                    _pastryIngredients = Ingredients.ToDictionary(x => x.Key, y => ((source.Ingredients.FirstOrDefault(z => z.Id == y.Key) as IIngredientModel)!, y.Value));
+                }
+                return _pastryIngredients;
+            }
+        }
+        public static Pastry? Create(PastryBindingModel model)
+        {
+            if (model == null)
+            {
+                return null;
+            }
+            return new Pastry()
+            {
+                Id = model.Id,
+                PastryName = model.PastryName,
+                Price = model.Price,
+                Ingredients = model.PastryIngredients.ToDictionary(x => x.Key, x => x.Value.Item2)
+            };
+        }
+
+        public static Pastry? Create(XElement element)
+        {
+            if (element == null)
+            {
+                return null;
+            }
+            return new Pastry()
+            {
+                Id = Convert.ToInt32(element.Attribute("Id")!.Value),
+                PastryName = element.Element("PastryName")!.Value,
+                Price = Convert.ToDouble(element.Element("Price")!.Value),
+                Ingredients = element.Element("PastryIngredients")!.Elements("PastryIngredient").ToDictionary(x => Convert.ToInt32(x.Element("Key")?.Value), x => Convert.ToInt32(x.Element("Value")?.Value))
+            };
+        }
+
+        public void Update(PastryBindingModel model)
+        {
+            if (model == null)
+            {
+                return;
+            }
+            PastryName = model.PastryName;
+            Price = model.Price;
+            Ingredients = model.PastryIngredients.ToDictionary(x => x.Key, x => x.Value.Item2);
+            _pastryIngredients = null;
+        }
+        public PastryViewModel GetViewModel => new()
+        {
+            Id = Id,
+            PastryName = PastryName,
+            Price = Price,
+            PastryIngredients = PastryIngredients
+        };
+        public XElement GetXElement => new("Pastry",
+        new XAttribute("Id", Id),
+        new XElement("PastryName", PastryName),
+        new XElement("Price", Price.ToString()),
+        new XElement("PastryIngredients", Ingredients.Select(x => new XElement("PastryIngredient",
+        new XElement("Key", x.Key),
+        new XElement("Value", x.Value)))
+        .ToArray()));
+    }
+}