我找不到解決方案,我的問題,如下所示:我正在ASP.net中創建一個MVC在線商店。一切工作正常,直到我嘗試將物品放入購物車。然後我得到「未設置爲對象實例的對象引用」錯誤。我嘗試了幾個解決方案,他們爲其他用戶解決了這個問題,但不幸的是,沒有任何運氣。請讓我知道如果你需要更多的我的代碼:在你的模型「對象引用未設置爲對象的實例」當添加到購物車
namespace Oblig2.Models
{
public class HandlevognViewModel
{
public List<Handlevogn> VognItems { get; set; }
public decimal VognTotal { get; set; }
}
}
@model Oblig2.Models.HandlevognViewModel
@{
ViewBag.Title = "Handlevogn";
}
<h2>Handlevogn</h2>
<p class="button"> @Html.ActionLink("Til Kassen", "AdresseBetale", "Kassen")</p>
<table>
<tr>
<th>Vare Navn</th>
<th>Pris </th>
<th>Antall </th>
</tr>
//This is where the error occurs.
@foreach (var item in Model.VognItems)
{
<tr>
<td>@item.Produkt.VareNavn</td>
<td>@item.Produkt.Pris</td>
<td>@item.Antall</td>
</tr>
}
</table>
namespace Oblig2.Controllers
{
public class VarerController : Controller
{
private ButikkDBContext db = new ButikkDBContext();
public ActionResult index()
{
return View(db.Produkt.ToList());
}
protected override void Dispose(bool disposing)
{
db.Dispose();
}
}
}
namespace Oblig2.Controllers
{
public class HandlevognController : Controller
{
ButikkDBContext db = new ButikkDBContext();
public ActionResult index()
{
var vogn = Vogn.GetVogn(this.HttpContext);
var viewModel = new HandlevognViewModel
{
VognItems = vogn.GetVognItems(),
VognTotal = vogn.GetTotal()
};
return View(viewModel);
}
public ActionResult LeggTil(int id)
{
var nyVare = db.Produkt.Single(vare => vare.VareNr == id);
var vogn = Vogn.GetVogn(this.HttpContext);
vogn.LeggTilHandleVogn(nyVare);
return RedirectToAction("index");
}
[ChildActionOnly]
public ActionResult VognSammendrag()
{
var vogn = Vogn.GetVogn(this.HttpContext);
ViewData["VognAntall"] = vogn.GetAntall();
return PartialView("VognSammendrag");
}
}
}
哪條線給你這個錯誤? –
歡迎來到Stackoverflow。作爲開始,請閱讀[FAQ]和[問]幾次。其次,請先閱讀['什麼是NullReferenceException,我該如何解決它?'](http://stackoverflow.com/questions/4660142/what-is-a-nullreferenceexception-and-how-do-i -fix-it) –
Model.VognItems爲null。你爲什麼在你的構造函數中創建一個列表並且不分配它? – therealtbs