почти готово, осталось понять, почему не получается создать заказ без исполнителя

SushiBar/FormMain.Designer.cs

@@ -125,6 +125,7 @@
             запускРаботToolStripMenuItem.Name = "запускРаботToolStripMenuItem";
             запускРаботToolStripMenuItem.Size = new Size(114, 24);
             запускРаботToolStripMenuItem.Text = "Запуск работ";
+            запускРаботToolStripMenuItem.Click += запускРаботToolStripMenuItem_Click;
             // 
             // dataGridView
             // 

SushiBar/FormMain.cs

@@ -11,12 +11,14 @@ namespace SushiBarView
         private readonly ILogger _logger;
         private readonly IOrderLogic _orderLogic;
         private readonly IReportLogic _reportLogic;
-        public FormMain(ILogger<FormMain> logger, IOrderLogic orderLogic, IReportLogic reportLogic)
+        private readonly IWorkProcess _workProcess;
+        public FormMain(ILogger<FormMain> logger, IOrderLogic orderLogic, IReportLogic reportLogic, IWorkProcess workProcess)
         {
             InitializeComponent();
             _logger = logger;
             _orderLogic = orderLogic;
             _reportLogic = reportLogic;
+            _workProcess = workProcess;
         }
         private void FormMain_Load(object sender, EventArgs e)
         {
@@ -195,5 +197,13 @@ namespace SushiBarView
                 form.ShowDialog();
             }
         }
+
+        private void запускРаботToolStripMenuItem_Click(object sender, EventArgs e)
+        {
+            _workProcess.DoWork((Program.ServiceProvider?.GetService(typeof(IImplementerLogic)) as IImplementerLogic)!,
+                _orderLogic);
+            MessageBox.Show("Процесс обработки запущен", "Сообщение",
+           MessageBoxButtons.OK, MessageBoxIcon.Information);
+        }
     }
 }

SushiBar/Program.cs

@@ -56,6 +56,7 @@ namespace SushiBar
             services.AddTransient<ISushiLogic, SushiLogic>();
             services.AddTransient<IClientLogic, ClientLogic>();
             services.AddTransient<IReportLogic, ReportLogic>();
+            services.AddTransient<IWorkProcess, WorkModeling>();
             services.AddTransient<IImplementerLogic, ImplementerLogic>();
 
             services.AddTransient<AbstractSaveToExcel, SaveToExcel>();

SushiBarBusinessLogic/WorkModeling.cs

@@ -0,0 +1,147 @@
+using Microsoft.Extensions.Logging;
+using SushiBarContracts.BindingModel;
+using SushiBarContracts.BusinessLogicsContracts;
+using SushiBarContracts.SearchModel;
+using SushiBarContracts.ViewModels;
+using SushiBarDataModels.Enums;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SushiBarBusinessLogic
+{
+    public class WorkModeling : IWorkProcess
+    {
+        private readonly ILogger _logger;
+        private readonly Random _rnd;
+        private IOrderLogic? _orderLogic;
+        public WorkModeling(ILogger<WorkModeling> logger)
+        {
+            _logger = logger;
+            _rnd = new Random(1000);
+        }
+        public void DoWork(IImplementerLogic implementerLogic, IOrderLogic orderLogic)
+        {
+            _orderLogic = orderLogic;
+            var implementers = implementerLogic.ReadList(null);
+            if (implementers == null)
+            {
+                _logger.LogWarning("DoWork. Implementers is null");
+                return;
+            }
+            var orders = _orderLogic.ReadList(new OrderSearchModel
+            {
+                Status = OrderStatus.Принят
+            });
+            if (orders == null || orders.Count == 0)
+            {
+                _logger.LogWarning("DoWork. Orders is null or empty");
+                return;
+            }
+            _logger.LogDebug("DoWork for {Count} orders", orders.Count);
+            foreach (var implementer in implementers)
+            {
+                Task.Run(() => WorkerWorkAsync(implementer, orders));
+            }
+        }
+        /// <summary>
+        /// Иммитация работы исполнителя
+        /// </summary>
+        /// <param name="implementer"></param>
+        /// <param name="orders"></param>
+        private async Task WorkerWorkAsync(ImplementerViewModel implementer, List<OrderViewModel> orders)
+        {
+            if (_orderLogic == null || implementer == null)
+            {
+                return;
+            }
+            await RunOrderInWork(implementer);
+            await Task.Run(() =>
+            {
+                foreach (var order in orders)
+                {
+                    try
+                    {
+                        _logger.LogDebug("DoWork. Worker {Id} try get order {Order} ", implementer.Id, order.Id);
+                        // пытаемся назначить заказ на исполнителя
+                        _orderLogic.TakeOrderInWork(new OrderBindingModel
+                        {
+                            Id = order.Id,
+                            ImplementerId = implementer.Id
+                        });
+                        // делаем работу
+                        Thread.Sleep(implementer.WorkExperience * _rnd.Next(100, 1000) * order.Count);
+                        _logger.LogDebug("DoWork. Worker {Id} finish order {Order} ", implementer.Id, order.Id);
+                        _orderLogic.FinishOrder(new OrderBindingModel
+                        {
+                            Id = order.Id
+                        });
+                    }
+                    // кто-то мог уже перехватить заказ, игнорируем ошибку
+                    catch (InvalidOperationException ex)
+                    {
+                        _logger.LogWarning(ex, "Error try get work");
+                    }
+                    // заканчиваем выполнение имитации в случае иной ошибки
+                    catch (Exception ex)
+                    {
+                        _logger.LogError(ex, "Error while do work");
+                        throw;
+                    }
+                    // отдыхаем
+                    Thread.Sleep(implementer.Qualification * _rnd.Next(10, 100));
+                }
+            });
+        }
+        /// <summary>
+        /// Ищем заказ, которые уже в работе (вдруг исполнителя прервали)
+        /// </summary>
+        /// <param name="implementer"></param>
+        /// <returns></returns>
+        private async Task RunOrderInWork(ImplementerViewModel implementer)
+        {
+            if (_orderLogic == null || implementer == null)
+            {
+                return;
+            }
+            try
+            {
+                var runOrder = await Task.Run(() => _orderLogic.ReadElement(new OrderSearchModel
+                {
+                    ImplementerId = implementer.Id,
+                    Status = OrderStatus.Выполняется
+                }));
+                if (runOrder == null)
+                {
+                    return;
+                }
+                _logger.LogDebug("DoWork. Worker {Id} back to order {Order}",
+               implementer.Id, runOrder.Id);
+                // доделываем работу
+                Thread.Sleep(implementer.WorkExperience * _rnd.Next(100, 300) *
+               runOrder.Count);
+                _logger.LogDebug("DoWork. Worker {Id} finish order {Order}",
+               implementer.Id, runOrder.Id);
+                _orderLogic.FinishOrder(new OrderBindingModel
+                {
+                    Id = runOrder.Id
+                });
+                // отдыхаем
+                Thread.Sleep(implementer.Qualification * _rnd.Next(10, 100));
+            }
+            // заказа может не быть, просто игнорируем ошибку
+            catch (InvalidOperationException ex)
+            {
+                _logger.LogWarning(ex, "Error try get work");
+            }
+            // а может возникнуть иная ошибка, тогда просто заканчиваем выполнение имитации
+            catch (Exception ex)
+            {
+                _logger.LogError(ex, "Error while do work");
+                throw;
+            }
+        }
+    }
+}

SushiBarContracts/BindingModel/OrderBindingModel.cs

@@ -15,7 +15,7 @@ namespace SushiBarContracts.BindingModel
         public int ClientId { get; set; }
         public int? ImplementerId { get; set; }
         public string ClientFIO { get; set; } = string.Empty;
-        public string ImplementerFIO { get; set; } = string.Empty;
+        public string? ImplementerFIO { get; set; } = string.Empty;
         public int Count { get; set; }
         public double Sum { get; set; }
         public OrderStatus Status { get; set; } = OrderStatus.Неизвестен;

SushiBarContracts/BusinessLogicsContracts/IWorkProcess.cs

@@ -0,0 +1,16 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SushiBarContracts.BusinessLogicsContracts
+{
+    public interface IWorkProcess
+    {
+        /// <summary>
+        /// Запуск работ
+        /// </summary>
+        void DoWork(IImplementerLogic implementerLogic, IOrderLogic orderLogic);
+    }
+}

SushiBarContracts/ViewModels/OrderViewModel.cs

@@ -18,7 +18,7 @@ namespace SushiBarContracts.ViewModels
         public string ClientFIO { get; set; } = string.Empty;
         
         [DisplayName("Имя исполнителя")]
-        public string ImplementerFIO { get; set; } = string.Empty;
+        public string? ImplementerFIO { get; set; } = string.Empty;
 
         [DisplayName("Суши")]
         public string SushiName { get; set; } = string.Empty;

SushiBarDatabaseImplement/Models/Order.cs

@@ -16,7 +16,6 @@ namespace SushiBarDatabaseImplement.Models
         [Required]
         public int ClientId { get; set; }
         
-        [Required]
         public int? ImplementerId { get; set; }
 
         [Required]

SushiBarRestApi/Controllers/ImplementerController.cs

@@ -0,0 +1,105 @@
+using DocumentFormat.OpenXml.Office2010.Excel;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Mvc;
+using SushiBarContracts.BindingModel;
+using SushiBarContracts.BusinessLogicsContracts;
+using SushiBarContracts.SearchModel;
+using SushiBarContracts.ViewModels;
+using SushiBarDataModels.Enums;
+
+namespace SushiBarRestApi.Controllers
+{
+
+    [Route("api/[controller]/[action]")]
+    [ApiController]
+    public class ImplementerController : Controller
+    {
+        private readonly ILogger _logger;
+        private readonly IOrderLogic _order;
+        private readonly IImplementerLogic _logic;
+        public ImplementerController(IOrderLogic order, IImplementerLogic logic,
+       ILogger<ImplementerController> logger)
+        {
+            _logger = logger;
+            _order = order;
+            _logic = logic;
+        }
+        [HttpGet]
+        public ImplementerViewModel? Login(string login, string password)
+        {
+            try
+            {
+                return _logic.ReadElement(new ImplementerSearchModel
+                {
+                    ImplementerFIO = login,
+                    Password = password
+                });
+            }
+            catch (Exception ex)
+            {
+                _logger.LogError(ex, "Ошибка авторизации сотрудника");
+                throw;
+            }
+        }
+        [HttpGet]
+        public List<OrderViewModel>? GetNewOrders()
+        {
+            try
+            {
+                return _order.ReadList(new OrderSearchModel
+                {
+                    Status = OrderStatus.Принят
+                });
+            }
+            catch (Exception ex)
+            {
+                _logger.LogError(ex, "Ошибка получения новых заказов");
+                throw;
+            }
+        }
+        [HttpGet]
+        public OrderViewModel? GetImplementerOrder(int implementerId)
+        {
+            try
+            {
+                return _order.ReadElement(new OrderSearchModel
+                {
+                    ImplementerId = implementerId
+                });
+            }
+            catch (Exception ex)
+            {
+                _logger.LogError(ex, "Ошибка получения текущего заказа исполнителя");
+
+                throw;
+            }
+        }
+        [HttpPost]
+        public void TakeOrderInWork(OrderBindingModel model)
+        {
+            try
+            {
+                _order.TakeOrderInWork(model);
+            }
+            catch (Exception ex)
+            {
+                _logger.LogError(ex, "Ошибка перевода заказа с №{Id} в работу",
+               model.Id);
+                throw;
+            }
+        }
+        [HttpPost]
+        public void FinishOrder(OrderBindingModel model)
+        {
+            try
+            {
+                _order.FinishOrder(model);
+            }
+            catch (Exception ex)
+            {
+                _logger.LogError(ex, "Ошибка отметки о готовности заказа с №{ Id} ", model.Id);
+                throw;
+            }
+        }
+    }
+}