Tutorials Design Patterns in C#
Pattern vs Anti-Pattern — Complete Guide
Pattern vs Anti-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 68 of 69
Pattern vs Anti-Pattern
GoF Core ✓ → Enterprise ✓ → Cloud & Craft
Cloud & Craft · 3 — Microservices & interviews · ~10 min · Module 8: Interview & System Design
What is this?
A pattern is a proven solution to a recurring problem; an anti-pattern looks like a solution but creates worse problems (god object, shared DB, golden hammer).
Why should you care?
ShopNest reviewers need shared language for “this smells like an anti-pattern.”
See it live — copy this example
Paste into a C# console or class library project and run dotnet run.
Console.WriteLine("PATTERN: Adapter around legacy warehouse");
Console.WriteLine("ANTI: God OrderService with SQL+email+payments");
Console.WriteLine("ANTI: Singleton DbContext");What happened?
- Name both sides.
- Patterns are contextual; misuse becomes anti-pattern (Singleton everywhere).
- Prefer concrete ShopNest examples in reviews.
Practice next
- List two patterns used well in ShopNest.
- List two anti-patterns to ban.
- Add them to a review checklist.
- Write a one-pager for the team.
- Pair-review with the checklist.
Remember
Pattern solves a known pain. Anti-pattern creates pain. Context decides.
ShopNest review language
PRs cite “shared DB anti-pattern” with a fix path.
Outcome: Faster, less personal debates.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
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