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What is Configuration in ASP.NET Core and how does it work?

Senior .NET Core
Quick Answer Configuration reads from multiple sources layered: JSON → environment variables → command-line → secrets. Each source can override previous values. IConfiguration is the unified interface. Bind sections to strongly-typed POCOs with services.Configure(config.GetSection("MySection")) for type-safe access throughout the app.

Answer

ASP.NET Core configuration is hierarchical and supports multiple providers:

  • appsettings.json
  • Environment-specific files
  • Env variables
  • Command-line arguments
  • Secrets / Key Vault

Values bind to strongly-typed classes and support reload-on-change.

S
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