добавила реализацию fileImplements для исполнителя

SushiBarFileImplement/DataFileSingleton.cs

@@ -15,10 +15,13 @@ namespace SushiBarFileImplement
 
         private readonly string ClientFileName = "Client.xml";
 
+        private readonly string ImplementerFileName = "Implementer.xml";
+
         public List<Component> Components { get; private set; }
         public List<Order> Orders { get; private set; }
         public List<Sushi> Sushis { get; private set; }
         public List<Client> Clients { get; private set; }
+        public List<Implementer> Implementers { get; private set; }
 
         public static DataFileSingleton GetInstance()
         {
@@ -33,13 +36,15 @@ namespace SushiBarFileImplement
         public void SaveSushis() => SaveData(Sushis, SushiFileName, "Sushis", x => x.GetXElement);
         public void SaveOrders() => SaveData(Orders, OrderFileName, "Orders", x => x.GetXElement);
         public void SaveClients() => SaveData(Clients, ClientFileName, "Clients", x => x.GetXElement);
+        public void SaveImplementers() => SaveData(Implementers, ImplementerFileName, "Implementers", x => x.GetXElement);
 
         private DataFileSingleton()
         {
             Components = LoadData(ComponentFileName, "Component", x => Component.Create(x)!)!;
             Sushis = LoadData(SushiFileName, "Sushi", x => Sushi.Create(x)!)!;
             Orders = LoadData(OrderFileName, "Order", x => Order.Create(x)!)!;
-            Clients = LoadData(ClientFileName, "Order", x => Client.Create(x)!)!;
+            Clients = LoadData(ClientFileName, "Client", x => Client.Create(x)!)!;
+            Implementers = LoadData(ImplementerFileName, "Implementer", x => Implementer.Create(x)!)!;
         }
 
         private static List<T>? LoadData<T>(string filename, string xmlNodeName, Func<XElement, T> selectFunction)

SushiBarFileImplement/Implements/ClientStorage.cs

@@ -1,11 +1,12 @@
 using SushiBarContracts.BindingModel;
 using SushiBarContracts.SearchModel;
+using SushiBarContracts.StoragesContracts;
 using SushiBarContracts.ViewModels;
 using SushiBarFileImplement.Models;
 
 namespace SushiBarFileImplement.Implements
 {
-    public class ClientStorage
+    public class ClientStorage : IClientStorage
     {
         private readonly DataFileSingleton source;
         public ClientStorage()

SushiBarFileImplement/Implements/ImplementerStorage.cs

@@ -0,0 +1,72 @@
+using SushiBarContracts.BindingModel;
+using SushiBarContracts.SearchModel;
+using SushiBarContracts.StoragesContracts;
+using SushiBarContracts.ViewModels;
+using SushiBarFileImplement.Models;
+
+namespace SushiBarFileImplement.Implements
+{
+    public class ImplementerStorage : IImplementerStorage
+    {
+        private readonly DataFileSingleton source;
+        public ImplementerStorage()
+        {
+            source = DataFileSingleton.GetInstance();
+        }
+        public List<ImplementerViewModel> GetFullList()
+        {
+            return source.Implementers.Select(x => x.GetViewModel).ToList();
+        }
+        public List<ImplementerViewModel> GetFilteredList(ImplementerSearchModel model)
+        {
+            if (string.IsNullOrEmpty(model.ImplementerFIO))
+            {
+                return new();
+            }
+            return source.Implementers.Where(x => x.ImplementerFIO.Contains(model.ImplementerFIO)).Select(x => x.GetViewModel).ToList();
+        }
+        public ImplementerViewModel? GetElement(ImplementerSearchModel model)
+        {
+            if (string.IsNullOrEmpty(model.ImplementerFIO) && !model.Id.HasValue)
+            {
+                return null;
+            }
+            return source.Implementers.FirstOrDefault(x => (!string.IsNullOrEmpty(model.ImplementerFIO) &&
+            x.ImplementerFIO == model.ImplementerFIO) || (model.Id.HasValue && x.Id == model.Id))?.GetViewModel;
+        }
+        public ImplementerViewModel? Insert(ImplementerBindingModel model)
+        {
+            model.Id = source.Implementers.Count > 0 ? source.Implementers.Max(x => x.Id) + 1 : 1;
+            var newImplementer = Implementer.Create(model);
+            if (newImplementer == null)
+            {
+                return null;
+            }
+            source.Implementers.Add(newImplementer);
+            source.SaveImplementers();
+            return newImplementer.GetViewModel;
+        }
+        public ImplementerViewModel? Update(ImplementerBindingModel model)
+        {
+            var client = source.Implementers.FirstOrDefault(x => x.Id == model.Id);
+            if (client == null)
+            {
+                return null;
+            }
+            client.Update(model);
+            source.SaveImplementers();
+            return client.GetViewModel;
+        }
+        public ImplementerViewModel? Delete(ImplementerBindingModel model)
+        {
+            var element = source.Implementers.FirstOrDefault(x => x.Id == model.Id);
+            if (element != null)
+            {
+                source.Implementers.Remove(element);
+                source.SaveImplementers();
+                return element.GetViewModel;
+            }
+            return null;
+        }
+    }
+}

SushiBarFileImplement/Models/Implementer.cs

@@ -0,0 +1,78 @@
+using SushiBarContracts.BindingModel;
+using SushiBarContracts.ViewModels;
+using SushiBarDataModels;
+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 Implementer : IImplementerModel
+    {
+        public int Id { get; private set; }
+        public string ImplementerFIO { get; private set; } = string.Empty;
+        public string Password { get; private set; } = string.Empty;
+        public int WorkExperience { get; private set; }
+        public int Qualification { get; private set; }
+        public static Implementer? Create(ImplementerBindingModel model)
+        {
+            if (model == null)
+            {
+                return null;
+            }
+            return new Implementer()
+            {
+                Id = model.Id,
+                ImplementerFIO = model.ImplementerFIO,
+                WorkExperience = model.WorkExperience,
+                Password = model.Password,
+                Qualification = model.Qualification,
+            };
+        }
+        public static Implementer? Create(XElement element)
+        {
+            if (element == null)
+            {
+                return null;
+            }
+            return new Implementer()
+            {
+                Id = Convert.ToInt32(element.Attribute("Id")!.Value),
+                ImplementerFIO = element.Element("ImplementerFIO")!.Value,
+                WorkExperience = Convert.ToInt32(element.Element("WorkExperience")!.Value),
+                Password = element.Element("Password")!.Value,
+                Qualification = Convert.ToInt32(element.Element("Qualification")!.Value),
+            };
+        }
+        public void Update(ImplementerBindingModel model)
+        {
+            if (model == null)
+            {
+                return;
+            }
+            ImplementerFIO = model.ImplementerFIO;
+            Qualification = model.Qualification;
+            Password = model.Password;
+            WorkExperience = model.WorkExperience;
+        }
+        public ImplementerViewModel GetViewModel => new()
+        {
+            Id = Id,
+            ImplementerFIO = ImplementerFIO,
+            WorkExperience = WorkExperience,
+            Password = Password,
+            Qualification = Qualification
+        };
+        public XElement GetXElement =>
+            new("Implementer",
+            new XAttribute("Id", Id),
+            new XElement("ImplementerFIO", ImplementerFIO),
+            new XElement("WorkExperience", WorkExperience),
+            new XElement("Password", Password),
+            new XElement("Qualification", Qualification)
+            );
+    }
+}