Реализована логика хранения клиента в файле

SecuritySystem/SecuritySystemFileImplement/DataFileSingleton.cs

@@ -9,9 +9,11 @@ namespace SecuritySystemFileImplement
         private readonly string ComponentFileName = "Component.xml";
         private readonly string OrderFileName = "Order.xml";
         private readonly string SecureFileName = "Secure.xml";
+        private readonly string ClientFileName = "Client.xml";
         public List<Component> Components { get; private set; }
         public List<Order> Orders { get; private set; }
         public List<Secure> Secures { get; private set; }
+        public List<Client> Clients { get; private set; }
         public static DataFileSingleton GetInstance()
         {
             if (instance == null)
@@ -23,11 +25,13 @@ namespace SecuritySystemFileImplement
         public void SaveComponents() => SaveData(Components, ComponentFileName, "Components", x => x.GetXElement);
         public void SaveSecures() => SaveData(Secures, SecureFileName, "Secures", x => x.GetXElement);
         public void SaveOrders() => SaveData(Orders, OrderFileName, "Orders", x => x.GetXElement);
+        public void SaveClients() => SaveData(Clients, ClientFileName, "Clients", x => x.GetXElement);
         private DataFileSingleton()
         {
             Components = LoadData(ComponentFileName, "Component", x => Component.Create(x)!)!;
             Secures = LoadData(SecureFileName, "Secure", x => Secure.Create(x)!)!;
             Orders = LoadData(OrderFileName, "Order", x => Order.Create(x)!)!;
+            Clients = LoadData(ClientFileName, "Client", x => Client.Create(x)!)!;
         }
         private static List<T>? LoadData<T>(string filename, string xmlNodeName,
        Func<XElement, T> selectFunction)

SecuritySystem/SecuritySystemFileImplement/Implements/ClientStorage.cs

@@ -0,0 +1,71 @@
+using SecuritySystemContracts.BindingModels;
+using SecuritySystemContracts.SearchModels;
+using SecuritySystemContracts.StoragesContracts;
+using SecuritySystemContracts.ViewModels;
+using SecuritySystemFileImplement.Models;
+
+namespace SecuritySystemFileImplement.Implements
+{
+    public class ClientStorage : IClientStorage
+    {
+        private readonly DataFileSingleton source;
+        public ClientStorage()
+        {
+            source = DataFileSingleton.GetInstance();
+        }
+        public List<ClientViewModel> GetFullList()
+        {
+            return source.Clients.Select(x => x.GetViewModel).ToList();
+        }
+        public List<ClientViewModel> GetFilteredList(ClientSearchModel model)
+        {
+            if (string.IsNullOrEmpty(model.Email))
+            {
+                return new();
+            }
+            return source.Clients.Where(x => x.Email.Contains(model.Email)).Select(x => x.GetViewModel).ToList();
+        }
+        public ClientViewModel? GetElement(ClientSearchModel model)
+        {
+            if (string.IsNullOrEmpty(model.Email) && !model.Id.HasValue)
+            {
+                return null;
+            }
+            return source.Clients.FirstOrDefault(x => (!string.IsNullOrEmpty(model.Email) && x.Email == model.Email) || (model.Id.HasValue && x.Id == model.Id))?.GetViewModel;
+        }
+        public ClientViewModel? Insert(ClientBindingModel model)
+        {
+            model.Id = source.Clients.Count > 0 ? source.Clients.Max(x => x.Id) + 1 : 1;
+            var newClient = Client.Create(model);
+            if (newClient == null)
+            {
+                return null;
+            }
+            source.Clients.Add(newClient);
+            source.SaveClients();
+            return newClient.GetViewModel;
+        }
+        public ClientViewModel? Update(ClientBindingModel model)
+        {
+            var client = source.Clients.FirstOrDefault(x => x.Id == model.Id);
+            if (client == null)
+            {
+                return null;
+            }
+            client.Update(model);
+            source.SaveClients();
+            return client.GetViewModel;
+        }
+        public ClientViewModel? Delete(ClientBindingModel model)
+        {
+            var element = source.Clients.FirstOrDefault(x => x.Id == model.Id);
+            if (element != null)
+            {
+                source.Clients.Remove(element);
+                source.SaveClients();
+                return element.GetViewModel;
+            }
+            return null;
+        }
+    }
+}