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Options pattern

As explained in ASP.NET Core in Action, 3e

The IOptions pattern is a .NET configuration pattern that represents application settings as strongly typed options objects obtained through dependency injection.

The options pattern represents application settings as strongly typed POCO objects and delivers them through dependency injection. It replaces fragile string-key lookups and manual conversions with named properties, type safety, and IntelliSense. Separate options classes can keep settings scoped to individual features. section 10.3

Injecting options into an endpoint

An endpoint can request IOptions<AppDisplaySettings> and read options.Value. The resulting POCO exposes properties such as Title and ShowCopyright, while the configuration binder converts values such as true into their built-in .NET types. section 10.3

How ASP.NET Core in Action, 3e covers it

How deep it goes
Explains POCO binding, injection, sequential configuration, OptionsBuilder, and service-backed configuration without covering validation or lifetime variants.
Examples
Demonstrates map and display settings, endpoint injection, currency binding, lambda configuration, and an injected currency provider.
What it assumes
Builds on IConfiguration and dependency injection while replacing direct string access with POCO options classes.
What you can do after
Apply it via dependency injection to consume typed settings and compose configuration from sections, code, or registered services.
How it connects
Connects strongly typed settings with IConfiguration, dependency injection, POCO classes, OptionsBuilder, and IConfigureOptions<T>.
Cover of ASP.NET Core in Action, 3e
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This explainer was generated by Manning's knowledge graph from the text of ASP.NET Core in Action, 3e. The section links point to the parts of the book it draws on.