microsoft-extensions-configuration

Validate appsettings.json on startup by binding values to strongly-typed C# classes and applying data annotations. This fail-fast approach ensures configuration integrity by throwing errors immediately if settings are missing or invalid before the application processes requests.

The options pattern binds configuration values from appsettings.json to strongly-typed C# classes. It supports named options, options snapshots, and options monitoring to manage dynamic configuration updates reliably across your application.

Implement complex validation logic by creating custom IValidateOptions<T> implementations. This allows you to enforce cross-property validation checks and apply environment-specific rules that standard data annotations cannot handle.

Reload .NET configuration dynamically using options snapshots and options monitoring. These patterns detect changes in appsettings.json and update bound strongly-typed settings automatically without restarting your application.

Yes, the options pattern integrates natively with .NET dependency injection. You can inject IOptions, IOptionsSnapshot, or IOptionsMonitor into your services to access validated configuration values throughout your application.