How deeply does .NET in Action, Second Edition cover result resource?

Demonstrates conditional result selection and several built-in response types without detailing their internal implementations.

Result resource

As explained in .NET in Action, Second Edition

ActionResult is an ASP.NET Core result abstraction that represents the outcome of handling a web request, including its response content and HTTP status code.

A result resource represents the response produced by handling a web request, including its content and HTTP status code. ASP.NET Core uses built-in results to return content, not-found responses, files, and other response types from minimal API actions. section 3.1.2

Use result resources when the default 200 response is not sufficient:

Return Results.NotFound when a requested font does not exist instead of silently selecting a default. section 3.1.2

Conditional response selection

An endpoint can call a method that reports success through a Boolean and supplies generated text through an out parameter, then select Results.Content or Results.NotFound accordingly.

How .NET in Action, Second Edition covers it

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Also explained in

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ASP.NET Core in Action, 3eActionResult<T> is an ASP.NET Core MVC result type that allows an action method to return either a typed value or an arbitrary HTTP action result.
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Building Web APIs with ASP.NET CoreActionResult is an ASP.NET Core action return type that can represent either a typed response value or an HTTP action result.
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Pro ASP.NET Core 7, Tenth EditionAn action result is an object representing a response produced by an MVC action method.

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Related concepts

IActionResultimplements · IActionResult is an ASP.NET Core MVC interface implemented by objects that represent the result of processing an HTTP request.
ControllerBaseproduced by · ControllerBase is the ASP.NET Core MVC base class providing controller behavior and action-result helpers without view-specific functionality.
web API action methodused by · A web API action method is a controller method associated with a matched HTTP request that processes it and produces a response.
resourcekind of · An API resource is a conceptual entity or target exposed through an interface and addressable for access or manipulation.
ViewResultincludes · ViewResult is an MVC action-result type that represents rendering a view with an optional name and model.

This explainer was generated by Manning's knowledge graph from the text of .NET in Action, Second Edition. The section links point to the parts of the book it draws on.