поколдовала, надеюсь без конфликтов обойдусь

AircraftPlant/AbstractShopListImplement/Client.cs

@@ -0,0 +1,52 @@
+using AircraftPlantContracts.BindingModels;
+using AircraftPlantContracts.ViewModels;
+using AircraftPlantDataModels;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace AircraftPlantListImplement
+{
+    public class Client : IClientModel
+    {
+        public int Id { get; private set; }
+        public string ClientFIO { get; set; } = string.Empty;
+        public string Email { get; set; } = string.Empty;
+        public string Password { get; set; } = string.Empty;
+        public static Client? Create(ClientBindingModel model)
+        {
+            if (model == null)
+            {
+                return null;
+            }
+
+            return new Client()
+            {
+                Id = model.Id,
+                ClientFIO = model.ClientFIO,
+                Email = model.Email,
+                Password = model.Password
+            };
+        }
+        public void Update(ClientBindingModel model)
+        {
+            if (model == null)
+            {
+                return;
+            }
+
+            ClientFIO = model.ClientFIO;
+            Email = model.Email;
+            Password = model.Password;
+        }
+        public ClientViewModel GetViewModel => new()
+        {
+            Id = Id,
+            ClientFIO = ClientFIO,
+            Email = Email,
+            Password = Password
+        };
+    }
+}

AircraftPlant/AbstractShopListImplement/ClientStorage.cs

@@ -0,0 +1,112 @@
+using AircraftPlantContracts.BindingModels;
+using AircraftPlantContracts.SearchModels;
+using AircraftPlantContracts.StoragesContracts;
+using AircraftPlantContracts.ViewModels;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace AircraftPlantListImplement
+{
+    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.ClientFIO) && string.IsNullOrEmpty(model.Email) && string.IsNullOrEmpty(model.Password) && !model.Id.HasValue)
+            {
+                return null;
+            }
+
+            foreach (var client in _source.Clients)
+            {
+                if (model.Id.HasValue && model.Id == client.Id)
+                    return client.GetViewModel;
+                if (!string.IsNullOrEmpty(model.Email) && !string.IsNullOrEmpty(model.Password) &&
+                    client.Email.Equals(model.Email) && client.Password.Equals(model.Password))
+                    return client.GetViewModel;
+                if (!string.IsNullOrEmpty(model.Email) && client.Email.Equals(model.Email))
+                    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;
+        }
+    }
+}

AircraftPlant/AbstractShopListImplement/DataListSingleton.cs

@@ -32,6 +32,11 @@ namespace AircraftPlantListImplement
         /// </summary>
         public List<Plane> Planes { get; set; }
 
+        /// <summary>
+        /// Список классов-моделей клиентов
+        /// </summary>
+        public List<Client> Clients { get; set; }
+
         /// <summary>
         /// Конструктор
         /// </summary>
@@ -40,6 +45,7 @@ namespace AircraftPlantListImplement
             Components = new List<Component>();
             Orders = new List<Order>();
             Planes = new List<Plane>();
+            Clients = new List<Client>();
         }
         /// <summary>
         /// Получить ссылку на класс

AircraftPlant/AbstractShopListImplement/Order.cs

@@ -5,6 +5,7 @@ using AircraftPlantDataModels.Models;
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Reflection;
 using System.Text;
 using System.Threading.Tasks;
 
@@ -25,6 +26,11 @@ namespace AircraftPlantListImplement.Models
         /// </summary>
         public int PlaneId { get; private set; }
 
+        /// <summary>
+        /// Идентификатор клиента
+        /// </summary>
+        public int ClientId { get; private set; }
+
         /// <summary>
         /// Количество изделий
         /// </summary>
@@ -66,6 +72,7 @@ namespace AircraftPlantListImplement.Models
             {
                 Id = model.Id,
                 PlaneId = model.PlaneId,
+                ClientId = model.ClientId,
                 Count = model.Count,
                 Sum = model.Sum,
                 Status = model.Status,
@@ -94,6 +101,7 @@ namespace AircraftPlantListImplement.Models
         {
             Id = Id,
             PlaneId = PlaneId,
+            ClientId = model.ClientId,
             Count = Count,
             Sum = Sum,
             Status = Status,

AircraftPlant/AbstractShopListImplement/OrderStorage.cs

@@ -49,7 +49,7 @@ namespace AircraftPlantListImplement.Implements
         public List<OrderViewModel> GetFilteredList(OrderSearchModel model)
         {
             var result = new List<OrderViewModel>();
-            if (!model.Id.HasValue || !model.DateFrom.HasValue || !model.DateTo.HasValue)
+            if (!model.Id.HasValue || !model.DateFrom.HasValue || !model.DateTo.HasValue || !model.ClientId.HasValue)
             {
                 return result;
             }
@@ -66,6 +66,13 @@ namespace AircraftPlantListImplement.Implements
                 return result;
             }
 
+            if (model.ClientId.HasValue && !model.Id.HasValue)
+            {
+                foreach (var order in _source.Orders)
+                {
+                    result.Add(GetViewModel(order));
+                }
+            }
 
             foreach (var order in _source.Orders)
             {
@@ -173,6 +180,16 @@ namespace AircraftPlantListImplement.Implements
                     break;
                 }
             }
+
+            foreach (var client in _source.Clients)
+            {
+                if (client.Id == order.ClientId)
+                {
+                    viewModel.ClientFIO = client.ClientFIO;
+                    break;
+                }
+            }
+
             return viewModel;
         }
     }

AircraftPlant/AircraftPlantFileImplement/Order.cs

@@ -15,7 +15,7 @@ namespace AircraftPlantFileImplement.Models
     {
         public int Id { get; private set; }
         public int PlaneId { get; private set; }
-
+        public int ClientId { get; private set; }
         public int Count { get; private set; }
         public double Sum { get; private set; }
         public OrderStatus Status { get; private set; }
@@ -31,6 +31,7 @@ namespace AircraftPlantFileImplement.Models
             {
                 Id = model.Id,
                 PlaneId = model.PlaneId,
+                ClientId = model.ClientId,
                 Count = model.Count,
                 Sum = model.Sum,
                 Status = model.Status,
@@ -48,6 +49,7 @@ namespace AircraftPlantFileImplement.Models
             {
                 Id = Convert.ToInt32(element.Attribute("Id")!.Value),
                 PlaneId = Convert.ToInt32(element.Element("PlaneId")!.Value),
+                ClientId = Convert.ToInt32(element.Element("ClientId")!.Value),
                 Sum = Convert.ToDouble(element.Element("Sum")!.Value),
                 Count = Convert.ToInt32(element.Element("Count")!.Value),
                 Status = (OrderStatus)Enum.Parse(typeof(OrderStatus), element.Element("Status")!.Value),
@@ -69,6 +71,7 @@ namespace AircraftPlantFileImplement.Models
         {
             Id = Id,
             PlaneId = PlaneId,
+            ClientId = ClientId,
             Count = Count,
             Sum = Sum,
             Status = Status,
@@ -78,6 +81,7 @@ namespace AircraftPlantFileImplement.Models
         public XElement GetXElement => new("Order",
             new XAttribute("Id", Id),
             new XElement("PlaneId", PlaneId),
+            new XElement("ClientId", ClientId),
             new XElement("Count", Count.ToString()),
             new XElement("Sum", Sum.ToString()),
             new XElement("Status", Status.ToString()),

AircraftPlant/AircraftPlantFileImplement/OrderStorage.cs

@@ -37,6 +37,14 @@ namespace AircraftPlantFileImplement.Implements
                     .ToList();
             }
 
+            if (model.ClientId.HasValue && !model.Id.HasValue)
+            {
+                return _source.Orders
+                    .Where(x => x.ClientId == model.ClientId)
+                    .Select(x => x.GetViewModel)
+                    .ToList();
+            }
+
             return _source.Orders.Where(x => x.Id.Equals(model.Id)).Select(x => GetViewModel(x)).ToList();
         }
         public OrderViewModel? GetElement(OrderSearchModel model)
@@ -86,7 +94,9 @@ namespace AircraftPlantFileImplement.Implements
         {
             var viewModel = order.GetViewModel;
             var plane = _source.Planes.FirstOrDefault(x => x.Id == order.PlaneId);
-            viewModel.PlaneName = plane?.PlaneName;
+            viewModel.PlaneName = plane?.PlaneName ?? string.Empty;
+            var client = _source.Clients.FirstOrDefault(x => x.Id == order.ClientId);
+            viewModel.ClientFIO = client?.ClientFIO ?? string.Empty;
             return viewModel;
         }
     }