部分视图错误对象引用没有设置,不明白为什么
本文关键字:设置 明白 为什么 视图 错误 对象引用 | 更新日期: 2023-09-27 17:50:03
我得到了这个错误后,我从购物车中删除,对象引用未设置为对象的实例。这发生在我的局部视图中。有办法解决这个问题吗?
TableContent。cshtml(部分视图)from Panier
@model Tp1WebStore3.ViewModels.ShoppingCartViewModel
@{
ViewBag.Title = "Table Content";
}
<a href="#" class="TableContent">
<table>
<tr>
<th>
Produit
</th>
<th>
Prix (unitaire)
</th>
<th>
Quantite
</th>
<th></th>
</tr>
@foreach (var item in Model.CartItems) <=== error is happening here
{
<tr id="row-@item.ProduitId">
<td>
@Html.ActionLink(item.Produit.Description, "Details", "Produit", new { id =
item.ProduitId }, null)
</td>
<td>
@item.Produit.Prix
</td>
<td id="item-count-@item.PanierId">
@item.Quantite
</td>
<td>
<a href="#" class="RemoveLink" data-id="@item.PanierId"> Enlever du panier
</a>
</td>
</tr>
}
<tr>
<td>
Total
</td>
<td></td>
<td></td>
<td id="cart-total">
@Model.CartTotal
</td>
</tr>
</table>
</a>
索引。
@model Tp1WebStore3.ViewModels.ShoppingCartViewModel
@{
ViewBag.Title = "Shopping Cart";
}
<script src="/Scripts/jquery-1.8.2.min.js" type="text/javascript"></script>
<script type="text/javascript">
$(function () {
$('.RemoveLink').click(function () {
$.ajax({
url: '/Panier/RemoveFromCart',
data: { id: $(this).data('id') },
type: 'POST',
cache: false,
success: function (result) {
$('#row-' + result.DeleteId).remove();
$('#row-' + result.DeleteId).fadeOut('slow');
$('#cart-status').text('Cart (' + result.CartCount + ')');
$('#update-message').text(result.Message);
$('#cart-total').text(result.CartTotal);
$.get('@Url.Action("TableContent", "Panier")')
$("#TableContent").html(data); });
},
error: function(XMLHttpRequest, textStatus, errorThrown) {
alert("Status: " + textStatus); alert("Error: " + errorThrown);
}
});
return false;
});
});
</script>
<h3>
<em>Details</em> du panier:
</h3>
<p class="button">
@Html.ActionLink("Checkout >>", "AddressAndPayment", "Checkout")
</p>
<div id="update-message">
</div>
<div id="table-content">
@Html.Partial("TableContent") <=== partial view call
</div>
PanierController.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using Tp1WebStore3.Models;
using Tp1WebStore3.ViewModels;
namespace Tp1WebStore3.Controllers
{
public class PanierController : Controller
{
//
// GET: /Panier/
Tp1WebStoreDBEntities dbProduit = new Tp1WebStoreDBEntities();
//
// GET: /ShoppingCart/
public ActionResult Index()
{
var cart = ShoppingCart.GetCart(this.HttpContext);
// Set up our ViewModel
var viewModel = new ShoppingCartViewModel
{
CartItems = cart.GetCartItems(),
CartTotal = cart.GetTotal()
};
// Return the view
return View(viewModel);
}
//
// GET: /Store/AddToCart/5
public ActionResult AddToCart(int id)
{
// Retrieve the album from the database
var addedProduit = dbProduit.Produits
.Single(produit => produit.ProduitId == id);
// Add it to the shopping cart
var cart = ShoppingCart.GetCart(this.HttpContext);
cart.AddToCart(addedProduit);
// Go back to the main store page for more shopping
return RedirectToAction("Index");
}
//
// AJAX: /ShoppingCart/RemoveFromCart/5
[HttpPost]
public ActionResult RemoveFromCart(int id)
{
// Remove the item from the cart
var cart = ShoppingCart.GetCart(this.HttpContext);
// Get the name of the album to display confirmation
string produitDescription = dbProduit.Paniers
.Single(item => item.PanierId == id).Produit.Description;
// Remove from cart
int itemCount = cart.RemoveFromCart(id);
// Display the confirmation message
var results = new ShoppingCartRemoveViewModel
{
Message = Server.HtmlEncode(produitDescription) +
" has been removed from your shopping cart.",
CartTotal = cart.GetTotal(),
CartCount = cart.GetCount(),
ItemCount = itemCount,
DeleteId = id
};
return Json(results);
/* return View("CartSummary"); */
}
//
// GET: /ShoppingCart/CartSummary
[ChildActionOnly]
public ActionResult CartSummary()
{
var cart = ShoppingCart.GetCart(this.HttpContext);
ViewData["CartCount"] = cart.GetCount();
return PartialView("CartSummary");
}
public ActionResult TableContent()
{
return PartialView("TableContent");
}
}
}
你确定了吗?CartItems不为空?
try this:
@if (Model.CartItems != null) { <=== add breakpoint here
foreach (var item in Model.CartItems) <=== error is happening here
{
...
}
}
,并在if上添加一个断点,检查值是否为null;-)
编辑:在ajax响应中,您可以重新加载partialview…
success: function (result) {
$('#yourPartialViewContainerId').load('/Action/PartialView');
...
但是要确保你的foreach items在你的partialView中不是空的