Tutorials Design Patterns in C#
Clean Architecture Pattern — Complete Guide
Clean Architecture Pattern — Complete Guide: free step-by-step lesson with examples, common mistakes, and interview tips — part of Design Patterns in C# on Toolliyo Academy.
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Design Patterns in C# · Lesson 62 of 69
Clean Architecture Pattern
GoF Core ✓ → Enterprise ✓ → Cloud & Craft
Cloud & Craft · 3 — Microservices & interviews · ~10 min · Module 7: ASP.NET Core Architecture Patterns
What is this?
Clean Architecture keeps domain/application at the center; UI and infrastructure are plugins with dependencies pointing inward.
Why should you care?
ShopNest core pricing rules should survive swapping EF or ASP.NET versions.
See it live — copy this example
Paste into a C# console or class library project and run dotnet run.
// Domain <- Application <- Adapters (Web, EF, Bus)
Console.WriteLine("PlaceOrderHandler depends on IOrderRepository");
Console.WriteLine("EfOrderRepository implements port in Infrastructure");
Console.WriteLine("Web project references Application, not Domain->Web");What happened?
- Inner layers define interfaces; outer layers build.
- Tests run use-cases with fakes.
- Avoid referencing Web from Domain.
Practice next
- Move ShopNest rules to Application/Domain.
- Define IOrderRepository port.
- build EF in Infrastructure.
- Add a use-case test with fakes.
- Swap notifier adapter.
Remember
Dependencies inward. Domain independent of frameworks. Adapters at edges.
ShopNest clean slices
Place-order tests run without SQL.
Outcome: CI stays fast; rules stay honest.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
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