40-10000 C#MVC 控制器类的创建

using Microsoft.AspNetCore.Mvc;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace WebAppMVC.Controllers
{
    public class FirstController1 : Controller
    {
        public IActionResult Index()
        {
            return View();
        }
    }
}