Tag Helpers in ASP.NET Core are a powerful feature that enables server-side code to participate in creating and rendering HTML elements in Razor views. They make your Razor markup more readable and maintainable by allowing you to use HTML-like syntax while still leveraging the full power of C#.
🏷️ What Are Tag Helpers?
Tag Helpers are C# classes that target HTML elements based on element name, attribute name, or parent tag. They allow you to:
- Attach server-side logic to HTML elements
- Generate dynamic content
- Simplify form handling, routing, and component rendering
🔧 How They Work
Tag Helpers are activated by adding the @addTagHelper directive in your Razor view or _ViewImports.cshtml file:
@addTagHelper *, Microsoft.AspNetCore.Mvc.TagHelpers
This makes built-in Tag Helpers (like asp-for, asp-action, asp-controller) available in your views.
📦 Common Built-in Tag Helpers
asp-for | Binds an input element to a model property |
asp-action | Specifies the action method to invoke |
asp-controller | Specifies the controller to target |
asp-route | Adds routing parameters to a link or form |
asp-validation-for | Displays validation messages for a model property |
environment | Conditionally renders content based on environment |
🧑💻 Example
<form asp-action="Login">
<input asp-for="Username" />
<span asp-validation-for="Username"></span>
<button type="submit">Login</button>
</form>
This example binds the input to the Username property of the model and sets up validation.
🛠️ Snitz Custom Tag Helpers
I have created several Tag Helpers to help with page renderring of various items.
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