Tag Helpers

Tag Helpers are a in ASP.NET Core that to create reusable components that can simplify the process of generating HTML elements. They provide a way to write HTML-like code directly in the Razor views, making it easier to work with HTML elements and attributes.

Tag Helpers are similar to HTML helpers in previous versions of ASP.NET, but they offer more flexibility and are more powerful. They can be used to generate HTML elements, modify existing elements, or even create custom elements.

Tag Helpers are defined as classes in ASP.NET Core, and they are typically placed in a separate folder within the structure. Each Tag Helper class is associated with one or more HTML elements or attributes, and it contains the logic for generating or modifying those elements.

To use a Tag Helper in a Razor view, you need to include the necessary namespace and add the Tag Helper attribute to the HTML element or attribute that you want to work with. The Tag Helper attribute specifies the name of the Tag Helper class that be used.

Here's an example of a simple Tag Helper that a custom HTML element:


namespace MyProject.TagHelpers
{
    [HtmlTargetElement("custom-element")]
    public class CustomElementTagHelper : TagHelper
    {
        public override void Process(TagHelperContext context, TagHelperOutput )
        {
            output.TagName = "div";
            output.Content.SetHtmlContent("

This is a custom element

"); } } }

In the above example, we define a Tag Helper class called “CustomElementTagHelper” that is associated with the “custom-element” HTML element. the Process method, we set the output tag name to “div” and set the content of the element to be a

tag with the text “This is a custom element”.

To use this Tag Helper in a Razor view, we need to include the namespace and add the Tag Helper attribute to the HTML element:



When the Razor view is rendered, the Tag Helper will be executed and the output will be:

This is a custom element

Tag Helpers can also accept parameters and more complex logic. They provide a powerful way to generate HTML elements and simplify the process of working with HTML in ASP.NET Core applications.

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