Question

这是我在通知控制器中的索引操作的代码。

public ActionResult Index()
        {
            //gets the current user
            ApplicationUser currentUser = System.Web.HttpContext.Current.GetOwinContext().GetUserManager<ApplicationUserManager>().FindById(System.Web.HttpContext.Current.User.Identity.GetUserId());

            //checks if the user is logged in
            bool val1 = (System.Web.HttpContext.Current.User != null) && System.Web.HttpContext.Current.User.Identity.IsAuthenticated;
            if (val1 == false)
            {
                return RedirectToAction("Login", "Account");
            }
            var myNotif = db.Notifications.Where(s => s.User1_Id == currentUser.Id || s.User2_Id == currentUser.Id).Where(s => s.Active_Status != currentUser.Id);
            ViewBag.Autobots = new NotificationStatus[myNotif.Count()];
            int i = 0;
            foreach(var item in myNotif)
            {
                ViewBag.Autobots[i].name = db.Users.Where(x => item.Active_Status == x.Id).First().FirstName + " " + db.Users.Where(x => item.Active_Status == x.Id).First().LastName;
                i++;
            }
            return View(myNotif.ToList());
        }

        private class NotificationStatus
        {
            string name;
        }

我在这里收到此错误。那么我该如何避免呢？我正在尝试将数据发送到视图，因此我使用的是字符串数组。我的Linq查询在任何地方都有错吗？ enter image description here

Answer 1

public ActionResult Index()
{
   var userId=User.Identity.GetUserId();

   if(!User.Identity.IsAuthenticated)  return RedirectToAction("Login", "Account");

  var myNotif = db.Notifications
              .Where(s => s.User1_Id == userId || s.User2_Id == userId )
              .Where(s => s.Active_Status != userId).ToList();

  ViewBag.Autobots = new NotificationStatus[myNotif.Count()];
  int i = 0;
  foreach(var item in myNotif)
    {
       var user=db.Users.FirstOrDefault(x=>x.Id==item.Active_Status);
       ViewBag.Autobots[i].name = user.FirstName + " " + user.LastName;
        i++;
    }
   return View(myNotif.ToList());
}

我只是重构你的代码，稍作修改。

这应该有用，在列表中不会给你那个错误。

我的兴趣是创建一个ViewModel，如：

public class ViewModel
{
 public List<Notification> Notifications {get;set;}
 public NotificationStatus[] NotificationStatusArr {get;set;}
}

并将viewmodel发送到视图，而不是ViewBags！

如何避免asp.net mvc中的System.Data.Entity.Core.EntityCommandExecutionException？

1 个答案: