configuration

Validate .NET configuration at startup by binding configuration sections to strongly-typed POCOs using the Options pattern and enabling startup validation. This ensures reliable startup behavior across environments by failing fast when settings are invalid.

IOptions provides immutable singleton configuration, IOptionsSnapshot supports per-request reloads, and IOptionsMonitor handles runtime changes. Choose the appropriate IOptions variant based on whether you need immutability, per-request reloads, or runtime change notifications.

Manage secrets safely by using user secrets, environment variables, or cloud key vaults to avoid storing secrets in source control. This approach ensures secure configuration layering across multiple deployment environments.

The best way to layer configuration is to combine appsettings.json, environment-specific files, and environment variables. This multi-source configuration layering supports multiple deployments by overriding base settings with environment-specific values.

Bind configuration sections to strongly-typed POCOs by registering your configuration options in Program.cs. Using the Options pattern with validation ensures typed configuration for .NET applications and reliable startup behavior.