Реализована логика хранения клиента в списке

SecuritySystem/SecuritySystemListImplement/DataListSingleton.cs

@@ -8,11 +8,13 @@ namespace SecuritySystemListImplement
         public List<Component> Components { get; set; }
         public List<Order> Orders { get; set; }
         public List<Secure> Secures { get; set; }
+        public List<Client> Clients { get; set; }
         private DataListSingleton()
         {
             Components = new List<Component>();
             Orders = new List<Order>();
             Secures = new List<Secure>();
+            Clients = new List<Client>();
         }
         public static DataListSingleton GetInstance()
         {

SecuritySystem/SecuritySystemListImplement/Implements/ClientStorage.cs

@@ -0,0 +1,104 @@
+using SecuritySystemContracts.BindingModels;
+using SecuritySystemContracts.SearchModels;
+using SecuritySystemContracts.StoragesContracts;
+using SecuritySystemContracts.ViewModels;
+using SecuritySystemListImplement.Models;
+
+namespace SecuritySystemListImplement.Implements
+{
+    public class ClientStorage : IClientStorage
+    {
+        private readonly DataListSingleton _source;
+        public ClientStorage()
+        {
+            _source = DataListSingleton.GetInstance();
+        }
+        public List<ClientViewModel> GetFullList()
+        {
+            var result = new List<ClientViewModel>();
+            foreach (var client in _source.Clients)
+            {
+                result.Add(client.GetViewModel);
+            }
+            return result;
+        }
+        public List<ClientViewModel> GetFilteredList(ClientSearchModel model)
+        {
+            var result = new List<ClientViewModel>();
+            if (string.IsNullOrEmpty(model.Email))
+            {
+                return result;
+            }
+            foreach (var client in _source.Clients)
+            {
+                if (client.Email.Contains(model.Email))
+                {
+                    result.Add(client.GetViewModel);
+                }
+            }
+            return result;
+        }
+        public ClientViewModel? GetElement(ClientSearchModel model)
+        {
+            if (string.IsNullOrEmpty(model.Email) && !model.Id.HasValue)
+            {
+                return null;
+            }
+            foreach (var client in _source.Clients)
+            {
+                if (
+                    (!string.IsNullOrEmpty(model.Email) &&
+                    client.Email == model.Email) ||
+                    (model.Id.HasValue && client.Id == model.Id)
+                )
+                {
+                    return client.GetViewModel;
+                }
+            }
+            return null;
+        }
+        public ClientViewModel? Insert(ClientBindingModel model)
+        {
+            model.Id = 1;
+            foreach (var client in _source.Clients)
+            {
+                if (model.Id <= client.Id)
+                {
+                    model.Id = client.Id + 1;
+                }
+            }
+            var newClient = Client.Create(model);
+            if (newClient == null)
+            {
+                return null;
+            }
+            _source.Clients.Add(newClient);
+            return newClient.GetViewModel;
+        }
+        public ClientViewModel? Update(ClientBindingModel model)
+        {
+            foreach (var client in _source.Clients)
+            {
+                if (client.Id == model.Id)
+                {
+                    client.Update(model);
+                    return client.GetViewModel;
+                }
+            }
+            return null;
+        }
+        public ClientViewModel? Delete(ClientBindingModel model)
+        {
+            for (int i = 0; i < _source.Clients.Count; ++i)
+            {
+                if (_source.Clients[i].Id == model.Id)
+                {
+                    var element = _source.Clients[i];
+                    _source.Clients.RemoveAt(i);
+                    return element.GetViewModel;
+                }
+            }
+            return null;
+        }
+    }
+}