microsoft-extensions-configuration

To validate .NET configuration at startup, register your settings using services.AddOptions<T>().BindConfiguration().ValidateDataAnnotations().ValidateOnStart(). This binds configuration sections to strongly-typed classes and enforces fail-fast validation rules immediately.

Data Annotations handle simple property-level validation rules, while IValidateOptions handles complex, cross-property validation logic. You can use both together to enforce comprehensive configuration correctness in ASP.NET Core and similar apps.

To bind a configuration section to a strongly-typed class, define a POCO for your settings and register it via Dependency Injection using services.AddOptions<YourSettings>().BindConfiguration("YourSection"). This enables compile-time checks and refactor safety.

Yes, named options work with PostConfigure in .NET dependency injection. This allows you to apply post-configuration logic to specific named option instances, integrating seamlessly with IOptionsMonitor and IOptionsSnapshot lifetimes.

Yes, the Options pattern supports complex cross-property validation for background services through IValidateOptions<T>. By implementing this interface and registering it via dependency injection, you ensure robust configuration correctness across various application types.