Tutorials Design Patterns in C#
Minimal API Pattern — Complete Guide
Minimal API 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 61 of 69
Minimal API Pattern
GoF Core ✓ → Enterprise ✓ → Cloud & Craft
Cloud & Craft · 3 — Microservices & interviews · ~10 min · Module 7: ASP.NET Core Architecture Patterns
What is this?
Minimal APIs map endpoints with thin lambdas/handlers — less ceremony than controllers for small services.
Why should you care?
ShopNest edge microservices can expose a few routes quickly without controller classes.
See it live — copy this example
Paste into a C# console or class library project and run dotnet run.
// var app = WebApplication.CreateBuilder(args).Build();
// app.MapPost("/orders", async (PlaceOrderCommand cmd, IMediator m) =>
// Results.Ok(await m.Send(cmd)));
Console.WriteLine("MapPost /orders -> mediator.Send");What happened?
- MapGet/MapPost bind parameters and return IResult.
- Still use DI, validation, and auth.
- Controllers remain fine for large surface areas.
Practice next
- Create a minimal API project.
- Map a POST that sends MediatR.
- Add auth with RequireAuthorization.
- Return TypedResults.
- Add OpenAPI metadata.
Remember
Thin endpoint mapping. Still use DI/mediators. Great for small surfaces.
ShopNest inventory minimal API
Small stock service uses MapPost/MapGet.
Outcome: Fast to scaffold; logic stays in handlers.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
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