Проект с моделями

FurnitureAssembly/FurnitureAssemblyDataModels/Enums/OrderStatus.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace FurnitureAssemblyDataModels.Enums
+{
+    public enum OrderStatus
+    {
+        Неизвестен = -1,
+        Принят = 0,
+        Выполняется = 1,
+        Готов = 2,
+        Выдан = 3
+    }
+}

FurnitureAssembly/FurnitureAssemblyDataModels/FurnitureAssemblyDataModels.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="7.0.0" />
+    <PackageReference Include="Microsoft.Extensions.Logging" Version="7.0.0" />
+    <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="7.0.0" />
+  </ItemGroup>
+
+</Project>

FurnitureAssembly/FurnitureAssemblyDataModels/IId.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace FurnitureAssemblyDataModels
+{
+    public interface IId
+    {
+        int Id { get; }
+    }
+}

FurnitureAssembly/FurnitureAssemblyDataModels/Models/IComponentModel.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace FurnitureAssemblyDataModels.Models
+{
+    public interface IComponentModel : IId
+    {
+        string ComponentName { get; }
+        double Cost { get; }
+    }
+}

FurnitureAssembly/FurnitureAssemblyDataModels/Models/IFurnitureModel.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace FurnitureAssemblyDataModels.Models
+{
+    public interface IFurnitureModel : IId
+    {
+        string FurnitureName { get; }
+        double Price { get; }
+        Dictionary<int, (IComponentModel, int)> FurnitureComponents { get; }
+    }
+}

FurnitureAssembly/FurnitureAssemblyDataModels/Models/IOrderModel.cs

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+using FurnitureAssemblyDataModels.Enums;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace FurnitureAssemblyDataModels.Models
+{
+    public interface IOrderModel : IId
+    {
+        int FurnitureId { get; }
+        int Count { get; }
+        double Sum { get; }
+        OrderStatus Status { get; }
+        DateTime DateCreate { get; }
+        DateTime? DateImplement { get; }
+    }
+}