Add project files.

SytelineSaAppEfDataModel/Services/CustomerOrderService.cs

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+using AutoMapper;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Microsoft.EntityFrameworkCore;
+using SytelineSaAppEfDataModel.Dtos;
+
+namespace SytelineSaAppEfDataModel.Services
+{
+    public class CustomerOrderService(SytelineSaAppDbContext context, IMapper mapper) : ICustomerOrderService
+    {
+        public async Task<IEnumerable<CustomerOrderDto>> GetAll()
+        {
+            return await context.CustomerOrders.Select(x => mapper.Map<CustomerOrderDto>(x))
+                .OrderByDescending(x => x.CreateDate).ToListAsync();
+        }
+
+        public async Task<CustomerOrderDto?> GetByOrderNumber(string orderNumber)
+        {
+            CustomerOrderDto? customerOrder = await context.CustomerOrders
+                .Where(x => x.CoNum == orderNumber)
+                .Select(x => mapper.Map<CustomerOrderDto>(x)).FirstOrDefaultAsync();
+            if (customerOrder == null) return null;
+            
+            customerOrder.CustomerOrderLines = await context.CustomerOrderLines
+                .Where(x => x.CoNum == orderNumber)
+                .Select(x => mapper.Map<CustomerOrderLineDto>(x)).ToListAsync();
+
+            foreach (CustomerOrderLineDto customerOrderLine in customerOrder.CustomerOrderLines)
+            {
+                customerOrderLine.CustomerOrderLineItems = await context.CustomerOrderLineItems
+                    .Where(x => x.CoNum == orderNumber && x.CoLine == customerOrderLine.CoLine)
+                    .Select(x => mapper.Map<CustomerOrderLineItemDto>(x)).ToListAsync();
+            }
+
+            return customerOrder;
+        }
+    }
+}