iot/projects/Infrastructure/Extensions/HtmlHelperExtensions.cs

using System;
using Microsoft.AspNetCore.Html;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Razor;
using Microsoft.AspNetCore.Mvc.Rendering;
using Microsoft.AspNetCore.Mvc.Routing;

namespace Infrastructure.Extensions
{
    public static class HtmlHelperExtensions
    {
        public static IUrlHelper GetUrlHelper(this IHtmlHelper helper)
        {
            return new UrlHelperFactory().GetUrlHelper(helper.ViewContext);
        }

        public static void Set(this IHtmlHelper helper, string key, string value)
        {
            helper.ViewContext.HttpContext.Items.Add(key, value);
        }

        public static IHtmlContent Get(this IHtmlHelper helper, string key)
        {
            if (helper.ViewContext.HttpContext.Items.TryGetValue(key, out object value))
            {
                return new HtmlString(value as string);
            }
            return HtmlString.Empty;
        }
    }
}