Controller Example

HomeController.cs

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Localization;
using <yourNamespace>.Models;

namespace <yourNamespace>.Controllers
{
    public class HomeController : Controller
    {
        private readonly IHtmlLocalizer<HomeController> _localizer;
        
        public HomeController(IHtmlLocalizer<HomeController> localizer)
        {
            this._localizer = localizer;
        }
        
        public IActionResult Contact()
        {
            ViewData["Message"] = _localizer["ContactPage"];
            return View();
        }
    }
}