Tag Helpers

• Server-side

• Trigger code execution

• Built-in or custom

• Replaces HTML Helpers

_ViewImports.cshtml

@addTagHelper *, Microsoft.AspNetCore.Mvc.TagHelpers

<a asp-controller="Home" asp-action="Index">Home</a>

Custom Tag Helpers

Creating a Tag Helper

public class EmailTagHelper : TagHelper
{
    public override void Process(
        TagHelperContext context, TagHelperOutput output)
        {
            ....
        }    
}

Using the Tag Helper

<email address="[e-mail]" content="Contact Us">
</email>

Registering Custom Tag Helper

@addTagHelper PieShop.TagHelpers.*, PieShop