SushiBar/SushiBarFileImplement/DataFileSingleton.cs

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+using SushiBarFileImplement.Models;
+using System.Linq;
+using System.Xml.Linq;
+
+namespace SushiBarFileImplement
+{
+    internal class DataFileSingleton
+    {
+        private static DataFileSingleton? instance;
+        private readonly string ComponentFileName = "Component.xml";
+        private readonly string OrderFileName = "Order.xml";
+        private readonly string SushiFileName = "Sushi.xml";
+        public List<Component> Components { get; private set; }
+        public List<Order> Orders { get; private set; }
+        public List<Sushi> Sushis { 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 SaveSushis() => SaveData(Sushis, SushiFileName, "Sushis", x => x.GetXElement);
+        public void SaveOrders() => SaveData(Orders, OrderFileName, "Orders", x => x.GetXElement);
+        private DataFileSingleton()
+        {
+            Components = LoadData(ComponentFileName, "Component", x => Component.Create(x)!)!;
+            Sushis = LoadData(SushiFileName, "Product", x => Sushi.Create(x)!)!;
+            Orders = new List<Order>();
+        }
+        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);
+            }
+        }
+    }
+}

SushiBar/SushiBarFileImplement/Implements/ComponentStorage.cs

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+using SushiBarContracts.BindingModels;
+using SushiBarContracts.SearchModels;
+using SushiBarContracts.StoragesContracts;
+using SushiBarContracts.ViewModels;
+using SushiBarFileImplement.Models;
+
+namespace SushiBarFileImplement.Implements
+{
+    public class ComponentStorage : IComponentStorage
+    {
+        private readonly DataFileSingleton source;
+        public ComponentStorage()
+        {
+            source = DataFileSingleton.GetInstance();
+        }
+        public List<ComponentViewModel> GetFullList()
+        {
+            return source.Components.Select(x => x.GetViewModel).ToList();
+        }
+        public List<ComponentViewModel> GetFilteredList(ComponentSearchModel model)
+        {
+            if (string.IsNullOrEmpty(model.ComponentName))
+            {
+                return new();
+            }
+            return source.Components.Where(x =>
+            x.ComponentName.Contains(model.ComponentName)).Select(x =>
+            x.GetViewModel).ToList();
+        }
+        public ComponentViewModel? GetElement(ComponentSearchModel model)
+        {
+            if (string.IsNullOrEmpty(model.ComponentName) && !model.Id.HasValue)
+            {
+                return null;
+            }
+            return source.Components.FirstOrDefault(x =>
+            (!string.IsNullOrEmpty(model.ComponentName) && 
+            x.ComponentName == model.ComponentName) ||
+            (model.Id.HasValue && x.Id == model.Id))?.GetViewModel;
+        }
+        public ComponentViewModel? Insert(ComponentBindingModel model)
+        {
+            model.Id = source.Components.Count > 0 ? source.Components.Max(x => x.Id) + 1 : 1;
+            var newComponent = Component.Create(model);
+            if (newComponent == null)
+            {
+                return null;
+            }
+            source.Components.Add(newComponent);
+            source.SaveComponents();
+            return newComponent.GetViewModel;
+        }
+        public ComponentViewModel? Update(ComponentBindingModel model)
+        {
+            var component = source.Components.FirstOrDefault(x => x.Id == model.Id);
+            if (component == null)
+            {
+                return null;
+            }
+            component.Update(model);
+            source.SaveComponents();
+            return component.GetViewModel;
+        }
+        public ComponentViewModel? Delete(ComponentBindingModel model)
+        {
+            var element = source.Components.FirstOrDefault(x => x.Id == model.Id);
+            if (element != null)
+            {
+                source.Components.Remove(element);
+                source.SaveComponents();
+                return element.GetViewModel;
+            }
+            return null;
+        }
+    }
+}

SushiBar/SushiBarFileImplement/Implements/OrderStorage.cs

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+using SushiBarContracts.BindingModels;
+using SushiBarContracts.SearchModels;
+using SushiBarContracts.StoragesContracts;
+using SushiBarContracts.ViewModels;
+using SushiBarFileImplement.Models;
+
+namespace SushiBarFileImplement.Implements
+{
+    public class OrderStorage : IOrderStorage
+    {
+        private readonly DataFileSingleton source;
+        public OrderStorage()
+        {
+            source = DataFileSingleton.GetInstance();
+        }
+        public List<OrderViewModel> GetFullList()
+        {
+            return source.Orders.Select(x => 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 =>
+            x.GetViewModel).ToList();
+        }
+        public OrderViewModel? GetElement(OrderSearchModel model)
+        {
+            if (!model.Id.HasValue)
+            {
+                return null;
+            }
+            return source.Orders.FirstOrDefault(x =>
+            (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 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 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 element.GetViewModel;
+            }
+            return null;
+        }
+    }
+}

SushiBar/SushiBarFileImplement/Implements/SushiStorage.cs

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+using SushiBarContracts.BindingModels;
+using SushiBarContracts.SearchModels;
+using SushiBarContracts.StoragesContracts;
+using SushiBarContracts.ViewModels;
+using SushiBarFileImplement.Models;
+
+namespace SushiBarFileImplement.Implements
+{
+    public class SushiStorage : ISushiStorage
+    {
+        private readonly DataFileSingleton source;
+        public SushiStorage()
+        {
+            source = DataFileSingleton.GetInstance();
+        }
+        public List<SushiViewModel> GetFullList()
+        {
+            return source.Sushis.Select(x => x.GetViewModel).ToList();
+        }
+
+        public List<SushiViewModel> GetFilteredList(SushiSearchModel model)
+        {
+            if (string.IsNullOrEmpty(model.SushiName))
+            {
+                return new();
+            }
+            return source.Sushis.Where(x => 
+            x.SushiName.Contains(model.SushiName)).Select(x => 
+            x.GetViewModel).ToList();
+        }
+
+        public SushiViewModel? GetElement(SushiSearchModel model)
+        {
+            if (string.IsNullOrEmpty(model.SushiName) && !model.Id.HasValue)
+            {
+                return null;
+            }
+            return source.Sushis.FirstOrDefault(x => 
+            (!string.IsNullOrEmpty(model.SushiName) &&
+            x.SushiName == model.SushiName) || 
+            (model.Id.HasValue && x.Id == model.Id))?.GetViewModel;
+        }
+
+        public SushiViewModel? Insert(SushiBindingModel model)
+        {
+            model.Id = source.Sushis.Count > 0 ? source.Sushis.Max(x => x.Id) + 1 : 1;
+            var newSushi = Sushi.Create(model);
+            if (newSushi == null)
+            {
+                return null;
+            }
+            source.Sushis.Add(newSushi);
+            source.SaveSushis();
+            return newSushi.GetViewModel;
+        }
+
+        public SushiViewModel? Update(SushiBindingModel model)
+        {
+            var sushi = source.Sushis.FirstOrDefault(x => x.Id == model.Id);
+            if (sushi == null)
+            {
+                return null;
+            }
+            sushi.Update(model);
+            source.SaveSushis();
+            return sushi.GetViewModel;
+        }
+
+        public SushiViewModel? Delete(SushiBindingModel model)
+        {
+            var element = source.Sushis.FirstOrDefault(x => x.Id == model.Id);
+            if (element != null)
+            {
+                source.Sushis.Remove(element);
+                source.SaveSushis();
+                return element.GetViewModel;
+            }
+            return null;
+        }
+    }
+}

SushiBar/SushiBarFileImplement/Models/Component.cs

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+using SushiBarContracts.BindingModels;
+using SushiBarContracts.ViewModels;
+using SushiBarDataModels.Models;
+using System.Xml.Linq;
+
+namespace SushiBarFileImplement.Models
+{
+    public class Component : IComponentModel
+    {
+        public int Id { get; private set; }
+        public string ComponentName { get; private set; } = string.Empty;
+        public double Cost { get; set; }
+        public static Component? Create(ComponentBindingModel model)
+        {
+            if (model == null)
+            {
+                return null;
+            }
+            return new Component()
+            {
+                Id = model.Id,
+                ComponentName = model.ComponentName,
+                Cost = model.Cost
+            };
+        }
+        public static Component? Create(XElement element)
+        {
+            if (element == null)
+            {
+                return null;
+            }
+            return new Component()
+            {
+                Id = Convert.ToInt32(element.Attribute("Id")!.Value),
+                ComponentName = element.Element("ComponentName")!.Value,
+                Cost = Convert.ToDouble(element.Element("Cost")!.Value)
+            };
+        }
+        public void Update(ComponentBindingModel model)
+        {
+            if (model == null)
+            {
+                return;
+            }
+            ComponentName = model.ComponentName;
+            Cost = model.Cost;
+        }
+        public ComponentViewModel GetViewModel => new()
+        {
+            Id = Id,
+            ComponentName = ComponentName,
+            Cost = Cost
+        };
+        public XElement GetXElement => new("Component",
+            new XAttribute("Id", Id),
+            new XElement("ComponentName", ComponentName),
+            new XElement("Cost", Cost.ToString()));
+    }
+}

SushiBar/SushiBarFileImplement/Models/Order.cs

@@ -0,0 +1,87 @@
+using SushiBarContracts.BindingModels;
+using SushiBarContracts.ViewModels;
+using SushiBarDataModels.Enums;
+using SushiBarDataModels.Models;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Xml.Linq;
+
+namespace SushiBarFileImplement.Models
+{
+    public class Order : IOrderModel
+    {
+        public int Id { get; private set; }
+        public int SushiId { get; private set; }
+        public int Count { get; private set; }
+        public double Sum { get; private set; }
+        public OrderStatus Status { get; private set; } = OrderStatus.Неизвестен;
+        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,
+                SushiId = model.SushiId,
+                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),
+                SushiId = Convert.ToInt32(element.Element("SushiId")!.Value),
+                Count = Convert.ToInt32(element.Element("Count")!.Value),
+                Sum = Convert.ToDouble(element.Element("Sum")!.Value),
+                Status = (OrderStatus)Enum.Parse(typeof(OrderStatus), element.Element("Status")!.Value.ToString()),
+                DateCreate = Convert.ToDateTime(element.Element("DateCreate")!.Value),
+                DateImplement = string.IsNullOrEmpty(element.Element("DateImplement")!.Value) ? null :
+                Convert.ToDateTime(element.Element("DateImplement")!.Value)
+            };
+        }
+        public void Update(OrderBindingModel model)
+        {
+            if (model == null)
+            {
+                return;
+            }
+            Status = model.Status;
+            DateImplement = model.DateImplement;
+        }
+        public OrderViewModel GetViewModel => new()
+        {
+            Id = Id,
+            SushiId = SushiId,
+            Count = Count,
+            Sum = Sum,
+            Status = Status,
+            DateCreate = DateCreate,
+            DateImplement = DateImplement,
+        };
+        public XElement GetXElement => new("Order",
+            new XAttribute("Id", Id),
+            new XElement("SushiId", SushiId),
+            new XElement("Count", Count),
+            new XElement("Sum", Sum.ToString()),
+            new XElement("Status", Status.ToString()),
+            new XElement("DateCreate", DateCreate.ToString()),
+            new XElement("DateImplement", DateImplement.ToString())
+        );
+    }
+}

SushiBar/SushiBarFileImplement/Models/Sushi.cs

@@ -0,0 +1,87 @@
+using SushiBarContracts.BindingModels;
+using SushiBarContracts.ViewModels;
+using SushiBarDataModels.Models;
+using System.Xml.Linq;
+
+namespace SushiBarFileImplement.Models
+{
+    public class Sushi : ISushiModel
+    {
+        public int Id { get; private set; }
+        public string SushiName { get; private set; } = string.Empty;
+        public double Price { get; private set; }
+        public Dictionary<int, int> Components { get; private set; } = new();
+        private Dictionary<int, (IComponentModel, int)>? _sushiComponents = null;
+        public Dictionary<int, (IComponentModel, int)> SushiComponents
+        {
+            get
+            {
+                if (_sushiComponents == null)
+                {
+                    var source = DataFileSingleton.GetInstance();
+                    _sushiComponents = Components.ToDictionary(x => x.Key, y =>
+                    ((source.Components.FirstOrDefault(z => z.Id == y.Key) as IComponentModel)!,
+                    y.Value));
+                }
+                return _sushiComponents;
+            }
+        }
+        public static Sushi? Create(SushiBindingModel model)
+        {
+            if (model == null)
+            {
+                return null;
+            }
+            return new Sushi()
+            {
+                Id = model.Id,
+                SushiName = model.SushiName,
+                Price = model.Price,
+                Components = model.SushiComponents.ToDictionary(x => x.Key, x
+               => x.Value.Item2)
+            };
+        }
+        public static Sushi? Create(XElement element)
+        {
+            if (element == null)
+            {
+                return null;
+            }
+            return new Sushi()
+            {
+                Id = Convert.ToInt32(element.Attribute("Id")!.Value),
+                SushiName = element.Element("SushiName")!.Value,
+                Price = Convert.ToDouble(element.Element("Price")!.Value),
+                Components = element.Element("SushiComponents")!.Elements("SushiComponent").ToDictionary(x =>
+                Convert.ToInt32(x.Element("Key")?.Value), x =>
+                Convert.ToInt32(x.Element("Value")?.Value))
+            };
+        }
+        public void Update(SushiBindingModel model)
+        {
+            if (model == null)
+            {
+                return;
+            }
+            SushiName = model.SushiName;
+            Price = model.Price;
+            Components = model.SushiComponents.ToDictionary(x => x.Key, x => x.Value.Item2);
+            _sushiComponents = null;
+        }
+        public SushiViewModel GetViewModel => new()
+        {
+            Id = Id,
+            SushiName = SushiName,
+            Price = Price,
+            SushiComponents = SushiComponents
+        };
+        public XElement GetXElement => new("Sushi",
+            new XAttribute("Id", Id),
+            new XElement("SushiName", SushiName),
+            new XElement("Price", Price.ToString()),
+            new XElement("SushiComponents", Components.Select(x =>
+            new XElement("SushiComponent",
+                new XElement("Key", x.Key),
+                new XElement("Value", x.Value))).ToArray()));
+    }
+}