mid.NET Core
How does configuration work in .NET Core?
Updated Feb 20, 2026
Short answer
Configuration is managed using multiple providers like JSON files, environment variables, and command-line arguments.
Deep explanation
Configuration is hierarchical and supports reload-on-change. Common sources:
- appsettings.json
- appsettings.{Environment}.json
- Environment variables
Real-world example
Different DB connection strings for dev, staging, and production.
Common mistakes
- - Hardcoding secrets
- - Not using environment configs
Follow-up questions
- How would you scale this?
- What are trade-offs?