Tag Helpers
Tag Helpers are ASP.NET Core components that process HTML-like elements during Razor view or page rendering.
Pro ASP.NET Core 7, Tenth Edition
A tag helper is an ASP.NET Core component implemented as a C# class that transforms HTML-like elements during Razor view or page processing.
- How it is used
- Transforms Razor view or page elements into HTML that reflects application routing, models, styling, or validation state.
- How deep it goes
- Works through subclassing, attribute binding, targeting, registration, output manipulation, context data, and model expressions; does not detail ModelExpression introspection.
- Examples
- Uses styled table rows, product-page links, shorthand table headers, model-property rows, conditional warnings, and RSVP validation.
- What you can do after
- Build it from scratch as a registered custom TagHelper, or apply built-in helpers to links, forms, assets, and validation displays.
Read how Pro ASP.NET Core 7, Tenth Edition explains Tag Helpers →
ASP.NET Core in Action, 3e
Tag Helpers are ASP.NET Core components that add server-side processing behavior to HTML-like elements in Razor files.
- How it is used
- Generates model-bound forms and server-rendered HTML in Razor Pages while keeping templates close to ordinary HTML.
- How deep it goes
- Works through generated form markup and custom TagHelper targeting, attribute binding, and Process(), including conditional output suppression.
- Examples
- Uses currency-converter forms, a checkout page with generated HTML, and a custom conditional element helper.
- What you can do after
- Build it from scratch with a custom TagHelper and Process(), or apply built-in form helpers in Razor Pages.
Related concepts
- classkind of · A class is a programming-language construct that defines a type’s structure or behavior and provides a basis for creating or representing objects.
- validation summaryincludes · A validation summary is a UI component that displays collected validation error messages for multiple fields or controls in a form.
- @addTagHelper directiveconfigured by · The @addTagHelper directive makes specified Tag Helpers available for processing in Razor views or pages.
- Order propertyconfigured by · An order property specifies the relative sequence, precedence, or position of elements, events, or operations.
- label tag helperincludes · The Label Tag Helper is an ASP.NET Core Tag Helper that generates labeled content and associates it with a model-bound form field.
- EnvironmentTagHelperincludes · EnvironmentTagHelper is an ASP.NET Core Tag Helper that conditionally renders element content according to the current hosting environment.
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