XXXXX不存在于当前上下文ASP.NET MVC中

Question

我已经为MVC Controller添加了一些代码以启用过滤功能。一切都很好，它没有识别数据库表，编译器告诉我名称＆＃39; bookingDate＆＃39;在当前上下文中不存在，但在上面几行中从数据库中提取数据它识别它很好，智能感知甚至建议自动完成它。

如果我对该行进行注释，那么第二个ViewBag就会出现错误，说明一个也不存在！下面是我的控制器的代码。我正在为我的ORM使用DB First Entity框架。我删除了其余的控制器代码，试图保持这个简短而甜蜜但我可以发布它，如果你需要它。

BookingController：

    using System;
    using System.Collections.Generic;
    using System.Data;
    using System.Data.Entity;
    using System.Linq;
    using System.Net;
    using System.Web;
    using System.Web.Mvc;
    using MooWoosCRM;

    namespace MooWoosCRM.Controllers
    {
public class BookingsController : Controller
{
    private Entities db = new Entities();

    // GET: Bookings
    public ActionResult Index(string sortOrder)
    {
        ViewBag.bookingDate = (from r in db.bookings
                               select r.bookingDate).Distinct();
        ViewBag.stallType = (from r in db.bookings
                             select r.stallType).Distinct();
        var model = from r in db.bookings
                   where r.bookingDate == bookingDate || bookingDate == null || bookingDate == ""
                    where r.stallType == stallType || stallType == null || stallType == ""
                    select r;

        ViewBag.stallSortParm = String.IsNullOrEmpty(sortOrder) ? "stall_desc" : "";
        ViewBag.DateSortParm = sortOrder == "Date" ? "date_desc" : "Date";
        var bookings = from s in db.bookings
                       select s;
        switch (sortOrder)
        {
            case "stall_desc":
                bookings = bookings.OrderByDescending(s => s.stallType);
                break;
            case "Date":
                bookings = bookings.OrderBy(s => s.bookingDate);
                break;
            case "date_desc":
                bookings = bookings.OrderByDescending(s => s.bookingDate);
                break;
            default:
                bookings = bookings.OrderBy(s => s.bookingTime);
                break;
        }
        return View(db.bookings.ToList());
    }

    // GET: Bookings/Details/5
    public ActionResult Details(int? id)
    {
        if (id == null)
        {
            return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
        }
        booking booking = db.bookings.Find(id);
        if (booking == null)
        {
            return HttpNotFound();
        }
        return View(booking);
    }