Structuring a .NET Core Solution

A clear solution structure is the foundation of maintainable architecture.

Common layout for enterprise apps:

src/
  MyApp.Api
  MyApp.Application
  MyApp.Domain
  MyApp.Infrastructure
tests/
  MyApp.Api.Tests
  MyApp.Application.Tests
  MyApp.Domain.Tests

Key ideas:

1. Separation of concerns — API, application logic, domain model, and infrastructure are isolated.

2. Independent testing — each layer can be tested in isolation.

3. Clear dependencies — outer layers depend on inner layers, never the reverse.

Architecture impact: A disciplined solution layout enforces boundaries and makes refactoring and scaling safer.

Reference:

Microsoft: Common Web Application Architectures

https://learn.microsoft.com/dotnet/architecture/modern-web-apps-azure/common-web-application-architectures