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NopRequiredTagHelper.cs

using Microsoft.AspNetCore.Razor.TagHelpers;

namespace Nop.Web.Framework.TagHelpers.Shared;

/// 
/// "nop-required" tag helper
/// 
[HtmlTargetElement("nop-required", TagStructure = TagStructure.WithoutEndTag)]
public partial class NopRequiredTagHelper : TagHelper
{
    #region Methods

    /// 
    /// Asynchronously executes the tag helper with the given context and output
    /// 
    /// Contains information associated with the current HTML tag
    /// A stateful HTML element used to generate an HTML tag
    /// A task that represents the asynchronous operation
    public override Task ProcessAsync(TagHelperContext context, TagHelperOutput output)
    {
        ArgumentNullException.ThrowIfNull(context);

        ArgumentNullException.ThrowIfNull(output);

        //clear the output
        output.SuppressOutput();

        output.TagName = "span";
        output.TagMode = TagMode.StartTagAndEndTag;
        output.Attributes.SetAttribute("class", "required");
        output.Content.SetContent("*");

        return Task.CompletedTask;
    }

    #endregion
}