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LabelTagHelper.cs

using Microsoft.AspNetCore.Mvc.ViewFeatures;
using Microsoft.AspNetCore.Razor.TagHelpers;

namespace Nop.Web.Framework.TagHelpers.Public;

/// <summary>
/// "label" tag helper
/// </summary>
[HtmlTargetElement("label", Attributes = FOR_ATTRIBUTE_NAME)]
public partial class LabelTagHelper : Microsoft.AspNetCore.Mvc.TagHelpers.LabelTagHelper
{
    #region Constants

    protected const string FOR_ATTRIBUTE_NAME = "asp-for";
    protected const string POSTFIX_ATTRIBUTE_NAME = "asp-postfix";

    #endregion

    #region Ctor

    public LabelTagHelper(IHtmlGenerator generator) : base(generator)
    {
    }

    #endregion

    #region Methods

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

        ArgumentNullException.ThrowIfNull(output);

        output.Content.Append(Postfix);

        await base.ProcessAsync(context, output);
    }

    #endregion

    #region Properties

    /// <summary>
    /// Indicates whether the input is disabled
    /// </summary>
    [HtmlAttributeName(POSTFIX_ATTRIBUTE_NAME)]
    public string Postfix { get; set; }

    #endregion
}