Проект с моделями

AbstractJewelryStoreModels/AbstractJewelryStoreModels.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

AbstractJewelryStoreModels/Enums/OrderStatus.cs

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+namespace AbstractJewelryStoreModels.Enums
+{
+    public enum OrderStatus
+    {
+        Неизвестен = -1,
+        Принят = 0,
+        Выполняется = 1,
+        Готов = 2,
+        Выдан = 3
+    }
+}

AbstractJewelryStoreModels/IId.cs

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+namespace AbstractJewelryStoreModels
+{
+    public interface IId
+    {
+        int Id { get; }
+    }
+}

AbstractJewelryStoreModels/Models/IComponentModel.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace AbstractJewelryStoreModels.Models
+{
+    internal class IComponentModel : IId
+    {
+        string ComponentName { get; }
+        double Cost { get; }
+    }
+}

AbstractJewelryStoreModels/Models/IOrderModel.cs

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+using AbstractJewelryStoreModels.Enums;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace AbstractJewelryStoreModels.Models
+{
+    internal class IOrderModel : IId
+    {
+        int ProductId { get; }
+        int Count { get; }
+        double Sum { get; }
+        OrderStatus Status { get; }
+        DateTime DateCreate { get; }
+        DateTime? DateImplement { get; }
+
+    }
+}

AbstractJewelryStoreModels/Models/IProductModel.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace AbstractJewelryStoreModels.Models
+{
+    internal class IProductModel : IId
+    {
+        string ProductName { get; }
+        double Price { get; }
+        Dictionary<int, (IComponentModel, int)> ProductComponents { get; }
+
+    }
+}