Url generation

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

URL generation is the process of constructing endpoint URLs from routing metadata and route parameter values.

URL generation constructs endpoint URLs from route templates and route values. It keeps links and redirects independent of hardcoded paths, so changing an endpoint URL does not require updating every caller. section 6.0 section 6.4

Routing matches a URL to an endpoint and extracts route values; URL generation reverses that process by combining route values with a route template. ASP.NET Core provides LinkGenerator for minimal APIs and other application services. section 6.4

Use the appropriate helper for the application style:

• Use LinkGenerator when generating URLs for minimal APIs or from middleware and other services. section 6.4
• Use IUrlHelper in Razor Pages and MVC controllers; its Page() method accepts a page path and additional route data. section 14.5 section 14.5.1
• Pass values matching route parameters to place them in the path; unmatched values become query-string data. section 14.5.1

Generating a Razor Page URL

A Razor Page can generate a currency-view link with Url.Page("Currency/View", new { code = "USD" }). The helper uses the page route template and the supplied code value. section 14.5.1

Figure 6.8 A comparison between routing and URL generation. Routing takes in a URL and generates route values, but URL generation uses route values to generate a URL.

Compare routing as URL-to-route-value mapping with URL generation as route-value-to-URL construction. section 6.4

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

How deep it goes

Explains reverse routing, route values, LinkGenerator, IUrlHelper, and query-string fallback, but not generator internals.

Examples

Uses renamed cart and basket paths, product/view/3, and a Currency/View page with the USD route value.

What it assumes

Assumes route templates and endpoint routing, while demonstrating URL generation for minimal APIs, Razor Pages, and MVC.

What you can do after

Apply it via LinkGenerator or IUrlHelper to create links and response redirects that follow route changes.

How it connects

Connects routing, route templates, minimal APIs, Razor Pages, MVC controllers, middleware, and redirects.

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Also explained in

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  Pro ASP.NET Core 7, Tenth EditionURL generation is the programmatic construction of resource or endpoint URLs from application configuration and routing information.

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Related concepts

• routingused by · Routing is the selection of a path, destination, or processing component to direct an item, request, or flow toward an intended endpoint.
• LinkGeneratorused by · LinkGenerator is an ASP.NET Core service that generates URL paths and URLs from endpoint routing information.
• form tag helperused by · The Form Tag Helper is an ASP.NET Core Tag Helper that processes Razor form elements and generates form-related HTML attributes and antiforgery content.
• route dataused by · Route data is a collection of named information associated with a route and made available for request handling, navigation, rendering, or URL generation.
• anchor tag helperused by · The Anchor Tag Helper is an ASP.NET Core component that generates anchor URLs from routing and Razor Page attributes.

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.