Question

我有这一行：

@Html.ActionLink("Discounts", "ListDiscounts", "Product", null, new { @class = ViewBag.Discount })

ListDiscounts是：

    public ViewResult ListDiscounts(int nrProducts = 5)
    {
        ViewBag.Discount = "selected";
        ProductsListViewModel model = new ProductsListViewModel
        {
            Products = repository.Products
            .Where(p => p.Discount != false)
            .Take(nrProducts)
        };

        return View(model); 
    }

呈现菜单的视图（我的单独折扣也将在哪里）

@model IEnumerable<string>

@Html.ActionLink("Home", "List", "Product")



@foreach (var link in Model) { 
@Html.RouteLink(link, new
{
  controller = "Product",
  action = "List",
  category = link,
  page = 1
},
new
{
    @class = link == ViewBag.SelectedCategory ? "selected" : null,        
}) 
}

ListDiscounts.cshtml

@model Sportsstore.WebUI.Models.ProductsListViewModel

@{
   ViewBag.Title = "ListDiscounts";
}

<h2>Discounts available</h2>

@foreach (var p in Model.Products)
{
Html.RenderPartial("ProductSummary", p);
}

我试图将选定的课程添加到我的＆＃39; a＆＃39;视图中的元素，但这不起作用。单击“折扣”链接时，ViewBag属性仍为空。

与ListDiscounts相关联的视图不是ActionLink行来自的视图（它们与具有部分视图的视图分开）但是从我理解的ViewBag特征具有某种全局状态这应该有用吗？

关于这里有什么问题的任何想法？

编辑：使用MVC 4

Answer 1

我相信有些东西你没有告诉我们这是问题所在。也许你只在post方法中填充了ViewBag，而不是你的get方法。我创建了一个测试应用程序，非常密切地模拟你的应用程序，它工作正常。

控制器

namespace MvcApplication1.Controllers
{
    public class HomeController : Controller
    {
        public ViewResult Index()
        {
            ViewBag.Discount = "selected";
            return View();
        }

        [HttpPost]
        public ViewResult Index(int nrProducts = 5)
        {
            var model = new ProductsListViewModel{Products = "stuff"};
            ViewBag.Discount = "selected";
            return View(model);
        }
    }
}

查看

@model MvcApplication1.Models.ProductsListViewModel


@Html.ActionLink("Discounts", "Index", "Home", null, new { @class = ViewBag.Discount })
@{ Html.RenderPartial("ViewPage1");}

@using (Html.BeginForm())
{
    <input type="submit" />
}

<强>部分

@Html.ActionLink("Discounts", "Index", "Home", null, new { @class = ViewBag.Discount })

当我查看源时，两个链接都具有我期望的类。在我点击链接后，他们也有预期的课程。因此，我相信您不会在Get和/或Post控制器方法

上填充视图包

Answer 2

如果你确定你在viewbag属性中有价值而不是 @class = ViewBag.Discount试试 @class = @ViewBag.Discount并查看是否有效

Answer 3

您只需尝试以下代码即可。更改Viewbag名称并尝试。

@Html.ActionLink("Discounts", "ListDiscounts", "Product", null, new { @class = ViewBag.CssDiscount })

public ViewResult ListDiscounts(int nrProducts = 5)
{
    ViewBag.CssDiscount = "selected";
    ProductsListViewModel model = new ProductsListViewModel
    {
        Products = repository.Products
        .Where(p => p.Discount != false)
        .Take(nrProducts)
    };

    return View(model); 
}

如何正确添加ViewBag属性作为html类属性？

3 个答案: