MVC 4: Doğrulamayı uyguladığım her zaman: "IEnumerable <SelectListItem>" türünde ViewData öğesi yok "

Question

Bu soruyu bildiren kişilerle başka yığın taşması sorularına baktım ama bunların hiçbiri yardım etmeyi başardı. Ancak hatayı alıyorum, yalnızca model özniteliklerine bir tür doğrulama uygulamayı denediğimde ve bu geçerliliği uygulamak için girişimde bulunduğumda (örn. Kalkış tarihinden önce iade tarihi). Doğru değeri seçersem çalışır.

public int Id { get; set; } 
    [Required(ErrorMessage = "-Select-")] 
    public string Departure { get; set; } 

    [Required(ErrorMessage = "-Select-")] 
    public string Arrivals { get; set; } 

    [Required(ErrorMessage = "Date Expected!")] 
    [DataType(DataType.Date)] 
    public System.DateTime DepartureDate { get; set; } 

    [Required(ErrorMessage = "Date Expected!")] 
    [DataType(DataType.Date)] 
    [GreaterThan("DepartureDate", ErrorMessage="Retrun date must be after departure date!")] 
    public System.DateTime ReturnDate { get; set; } 

görünüm:

<p>From: </p> 
@Html.DropDownList("Departures", ViewData["departures"] as List<SelectListItem>); 
@Html.ValidationMessageFor(model => model.Departure, "Please choose a location"); 
<p>To: </p> 
@Html.DropDownList("Arrivals", ViewData["arrivals"] as List<SelectListItem>); 
@Html.ValidationMessageFor(model => model.Arrivals, "Please choose a location"); 

Departures.Add(new SelectListItem { Text = "Bristol", Value = "Bristol" }); 
ViewData["departures"] = Departures; 

çok daha fazla .Add 'ler vardır ve bu da gelenler

için tekrarlanır (Seç liste benim denetleyicisi başlatılır)

 [HttpGet] 
    public ActionResult BookFlight() 
    { 
     // Check if the user is logged in, if not redirect to log in page 
     if (User.Identity.IsAuthenticated) 
     { 
      Departures.Add(new SelectListItem { Text="-Select-", Value="0" }); 
      Departures.Add(new SelectListItem { Text = "London", Value = "London" }); 
      Departures.Add(new SelectListItem { Text = "Manchester", Value = "Manchester" }); 
      Departures.Add(new SelectListItem { Text = "Edinburgh", Value = "Edinburgh" }); 
      Departures.Add(new SelectListItem { Text = "East Midlands", Value = "East Midlands" }); 
      Departures.Add(new SelectListItem { Text = "Bristol", Value = "Bristol" }); 
      ViewData["departures"] = Departures; 

      Arrivals.Add(new SelectListItem { Text = "-Select- ", Value = "0" }); 
      Arrivals.Add(new SelectListItem { Text = "Paris", Value = "Paris" }); 
      Arrivals.Add(new SelectListItem { Text = "Barcelona", Value = "Barcelona" }); 
      Arrivals.Add(new SelectListItem { Text = "Madrid", Value = "Madrid" }); 
      Arrivals.Add(new SelectListItem { Text = "Amsterdam", Value = "Amsterdam" }); 
      Arrivals.Add(new SelectListItem { Text = "Prague", Value = "Prague" }); 
      Arrivals.Add(new SelectListItem { Text = "Nice", Value = "Nice" }); 
      Arrivals.Add(new SelectListItem { Text = "Milan", Value = "Milan" }); 
      Arrivals.Add(new SelectListItem { Text = "Geneva", Value = "Geneva" }); 
      Arrivals.Add(new SelectListItem { Text = "Rome", Value = "Rome" }); 
      ViewData["arrivals"] = Arrivals; 

      return View(); 

     } 
     else 
      return RedirectToAction("../User/LogIn"); 
    } 

    [HttpPost] 
    public ActionResult BookFlight(FlightDetailsMD flights, FormCollection form) 
    { 
     Random rand = new Random(); 
     Random rand2 = new Random(); 
     if (ModelState.IsValid) 
     { 
      var departureVal = form["departures"]; 
      var arrivalVal = form["arrivals"]; 
      using (var db = new FlightDetailsEntities()) 
      { 
       var user = db.FlightDetails.Create(); 

       user.Id = rand.Next(100000, 199999) + rand2.Next(100000, 199999); 
       user.Departure = departureVal; 
       user.Arrivals = arrivalVal; 
       user.DepartureDate = flights.DepartureDate; 
       user.ReturnDate = flights.ReturnDate; 

       db.FlightDetails.Add(user); 
       db.SaveChanges(); 

       MailMessage mail = new MailMessage(); 
       mail.To.Add(User.Identity.Name); 
       mail.From = new MailAddress(User.Identity.Name); 
       mail.Subject = "Booking Confirmation"; 
       string Body = "Email from: <i>insert company name</i><br><br> Your booking is confirmed! You are going to " + user.Arrivals + 
        " on " + string.Format("{0:dd/MM/yyyy}", user.DepartureDate) + " and returning to " + user.Departure + " on " + string.Format("{0:dd/MM/yyyy}", user.ReturnDate) + 
        ".<br> Thank you for booking with us and we hope you have a nice time!" + "<br><h2>Reference #" + user.Id + "</h2>"; 
       mail.Body = Body; 
       mail.IsBodyHtml = true; 
       //SmtpClient client = new SmtpClient(); 
       using (SmtpClient client = new SmtpClient()) 
       { 
        client.EnableSsl = true; 
        client.UseDefaultCredentials = false; 
        client.Credentials = new NetworkCredential(User.Identity.Name, "RecurveBow"); 
        client.Host = "smtp.live.com"; 
        client.Port = 587; 
        client.DeliveryMethod = SmtpDeliveryMethod.Network; 
        client.Send(mail); 
       } 
        /* 
        ViewData["departures"] = Departures; 
        ViewData["arrivals"] = Arrivals; 
       */ 

       /* 
        ViewData["departures"] = " "; 
        ViewData["arrivals"] = " "; 
       */ 

       return RedirectToAction("BookingDetails", "Home"); 
      } 
     } 

     return View(); 
    } 

Answer 1

bazı değişiklikler yaptı. buna bir bak :).

[HttpGet] 
    public ActionResult BookFlight() 
    { 
     // Check if the user is logged in, if not redirect to log in page 
     if (User.Identity.IsAuthenticated) 
     { 
      SetDepartureandArrival(); 
      return View(); 

     } 
     else 
      return RedirectToAction("../User/LogIn"); 
    } 
    public void SetDepartureandArrival() 
    { 
      Departures.Add(new SelectListItem { Text = "-Select-", Value = "0" }); 
      Departures.Add(new SelectListItem { Text = "London", Value = "London" }); 
      Departures.Add(new SelectListItem { Text = "Manchester", Value = "Manchester" }); 
      Departures.Add(new SelectListItem { Text = "Edinburgh", Value = "Edinburgh" }); 
      Departures.Add(new SelectListItem { Text = "East Midlands", Value = "East Midlands" }); 
      Departures.Add(new SelectListItem { Text = "Bristol", Value = "Bristol" }); 
      ViewData["departures"] = Departures; 

     Arrivals.Add(new SelectListItem { Text = "-Select- ", Value = "0" }); 
     Arrivals.Add(new SelectListItem { Text = "Paris", Value = "Paris" }); 
     Arrivals.Add(new SelectListItem { Text = "Barcelona", Value = "Barcelona" }); 
     Arrivals.Add(new SelectListItem { Text = "Madrid", Value = "Madrid" }); 
     Arrivals.Add(new SelectListItem { Text = "Amsterdam", Value = "Amsterdam" }); 
     Arrivals.Add(new SelectListItem { Text = "Prague", Value = "Prague" }); 
     Arrivals.Add(new SelectListItem { Text = "Nice", Value = "Nice" }); 
     Arrivals.Add(new SelectListItem { Text = "Milan", Value = "Milan" }); 
     Arrivals.Add(new SelectListItem { Text = "Geneva", Value = "Geneva" }); 
     Arrivals.Add(new SelectListItem { Text = "Rome", Value = "Rome" }); 
     ViewData["arrivals"] = Arrivals; 
    } 
    [HttpPost] 
    public ActionResult BookFlight(FlightDetailsMD flights, FormCollection form) 
    { 
     Random rand = new Random(); 
     Random rand2 = new Random(); 
     if (ModelState.IsValid) 
     { 
      var departureVal = form["departures"]; 
      var arrivalVal = form["arrivals"]; 
      using (var db = new FlightDetailsEntities()) 
      { 
       var user = db.FlightDetails.Create(); 

       user.Id = rand.Next(100000, 199999) + rand2.Next(100000, 199999); 
       user.Departure = departureVal; 
       user.Arrivals = arrivalVal; 
       user.DepartureDate = flights.DepartureDate; 
       user.ReturnDate = flights.ReturnDate; 

       db.FlightDetails.Add(user); 
       db.SaveChanges(); 

       MailMessage mail = new MailMessage(); 
       mail.To.Add(User.Identity.Name); 
       mail.From = new MailAddress(User.Identity.Name); 
       mail.Subject = "Booking Confirmation"; 
       string Body = "Email from: <i>insert company name</i><br><br> Your booking is confirmed! You are going to " + user.Arrivals + 
        " on " + string.Format("{0:dd/MM/yyyy}", user.DepartureDate) + " and returning to " + user.Departure + " on " + string.Format("{0:dd/MM/yyyy}", user.ReturnDate) + 
        ".<br> Thank you for booking with us and we hope you have a nice time!" + "<br><h2>Reference #" + user.Id + "</h2>"; 
       mail.Body = Body; 
       mail.IsBodyHtml = true; 
       //SmtpClient client = new SmtpClient(); 
       using (SmtpClient client = new SmtpClient()) 
       { 
        client.EnableSsl = true; 
        client.UseDefaultCredentials = false; 
        client.Credentials = new NetworkCredential(User.Identity.Name, "RecurveBow"); 
        client.Host = "smtp.live.com"; 
        client.Port = 587; 
        client.DeliveryMethod = SmtpDeliveryMethod.Network; 
        client.Send(mail); 
       } 


       return RedirectToAction("BookingDetails", "Home"); 
      } 
     } 
     SetDepartureandArrival(); 
     return View(); 
    }