microsoft-extensions-configuration

Validate .NET configuration settings at startup by calling .ValidateDataAnnotations() and .ValidateOnStart() on your options builder. This ensures fail-fast startup validation by checking bound POCO class properties before the application begins processing requests.

IOptionsSnapshot and IOptionsMonitor differ in scope and reload behavior in ASP.NET Core. IOptionsSnapshot recomputes settings per request scope, while IOptionsMonitor detects configuration changes dynamically and supports change notifications across the application lifetime.

Implement custom validation logic for complex options in .NET by creating a class that implements the IValidateOptions<T> interface. This allows you to enforce cross-property rules or perform external checks that are not possible with standard data annotations.

Yes, you can modify configuration values after binding but before validation in ASP.NET Core by using PostConfigure. This allows you to adjust or override settings dynamically in the pipeline right before the IValidateOptions<T> logic executes.

Bind a configuration section to a POCO class in .NET by using the AddOptions().BindConfiguration() method during dependency injection setup. This creates strongly-typed settings that can be injected into services via IOptions<T>.

Yes, IOptions works with named options in generic .NET apps to manage multiple distinct configurations of the same class. This allows you to inject specific named configurations dynamically depending on the requesting service's requirements.