Добавлена модель клиента для логики хранеиния в файле

SecuritySystem/SecuritySystemFileImplement/Models/Client.cs

@@ -0,0 +1,68 @@
+using SecuritySystemContracts.BindingModels;
+using SecuritySystemContracts.ViewModels;
+using SecuritySystemDataModels.Models;
+using SecuritySystemFileImplement.Models;
+using System.Reflection;
+using System.Xml.Linq;
+
+namespace SecuritySystemFileImplement.Models
+{
+    public class Client : IClientModel
+    {
+        public int Id { get; private set; }
+        public string ClientFIO { get; private set; } = string.Empty;
+        public string Email { get; private set; } = string.Empty;
+        public string Password { get; private set; } = string.Empty;
+        public static Client? Create(ClientBindingModel model)
+        {
+            if (model == null)
+            {
+                return null;
+            }
+            return new Client()
+            {
+                Id = model.Id,
+                Email = model.Email,
+                Password = model.Password,
+                ClientFIO = model.ClientFIO
+            };
+        }
+        public static Client? Create(XElement element)
+        {
+            if (element == null)
+            {
+                return null;
+            }
+            return new Client()
+            {
+                Id = Convert.ToInt32(element.Attribute("Id")!.Value),
+                Email = Convert.ToString(element.Attribute("Email")!.Value),
+                Password = Convert.ToString(element.Attribute("Password")!.Value),
+                ClientFIO = Convert.ToString(element.Attribute("ClientFIO")!.Value)
+            };
+        }
+        public void Update(ClientBindingModel model)
+        {
+            if (model == null)
+            {
+                return;
+            }
+            Email = model.Email;
+            Password = model.Password;
+            ClientFIO = model.ClientFIO;
+        }
+        public ClientViewModel GetViewModel => new()
+        {
+            Id = Id,
+            Email = Email,
+            Password = Password,
+            ClientFIO = ClientFIO
+        };
+        public XElement GetXElement => new("Сlient",
+            new XAttribute("Id", Id),
+            new XElement("Email", Email),
+            new XElement("Password", Password),
+            new XElement("ClientFIO", ClientFIO)
+        );
+    }
+}