c# - 使用 MVC 4 在 C# 中使用 Session 进行 foreach 循环

Question

我正在使用 MVC 4 在 C# 中为我的项目创建购物车。
我在 session 中以数组形式存储了 3 个值:名称、价格和描述。
当我尝试调用 foreach 循环的 Session 时，它显示
“foreach 语句无法对‘object’类型的变量进行操作，因为‘object’不包含‘GetEnumerator’的公共(public)定义” 我需要改变什么？ 任何帮助将不胜感激。 谢谢

类(class).cshtml

@model IEnumerable<ANON_Capstone.Models.Course>

@if (!User.Identity.IsAuthenticated)
{
@section featured
{
    <section class="featured">
        <div class="content-wrapper">
            <h2 class="text-center">Please Login or Create an Account to make a Purchase!</h2>
        </div>
    </section>
}
}

<div class="row">
<div class="col-lg-9">
    <h2><strong>Courses</strong></h2><br />
    @foreach (var item in Model)
    {
        <div class="col-md-4 col-xs-6 col-s-8 col-lg-4">
            @using (Html.BeginForm("ShoppingCart", "Home"))
            {
                <img src="~/Images/party.gif" style="width: 175px" class="img-responsive" />
                <h2>@item.className</h2>
                <p><a href="https://stackoverflow.com/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="d9fd99b0adbcb4f7bab5b8aaaa89abb0babc" rel="noreferrer noopener nofollow">[email protected]</a> -- @item.maxStudent spots left! </p>
                <input type="text" name="product" value="@item.className" hidden="hidden" />
                <input type="text" name="totalPrice" value="@item.classPrice" hidden="hidden"  />
                <input type="text" name="custom" value="@item.ClassID" hidden="hidden" />
                if (User.Identity.IsAuthenticated)
                {
                <input class="btn btn-default" type="submit" name="btnConfirm" value="Add to Shopping Cart" />
                }
            }
            <br />
        </div>
    }
</div>
</div>

HomeController.cs

using System;
using System.Collections.Generic;
using System.Data;
using System.Data.Entity;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using ANON_Capstone.Models;

namespace ANON_Capstone.Controllers
{
public class HomeController : Controller
{
    private UsersContext db = new UsersContext();

    public ActionResult Index()
    {
        return View();
    }

    public ActionResult About()
    {
        return View();
    }

    public ActionResult Contact()
    {
        return View();
    }

    public ActionResult Courses()
    {

        return View(db.Courses.ToList());

    }

    [HttpPost]
    public ActionResult ShoppingCart()
    {
        return View();
    }

    public ActionResult ShoppingCart(string className, string classPrice, string classDesc)
    {
        String[] cart = { className, classPrice, classDesc };
        Session["Cart"] = cart;
        return View();
    }
}
}

ShoppingCart.cshtml

@{
ViewBag.Title = "ShoppingCart";
}

<h2>ShoppingCart</h2>

@using (Html.BeginForm("ValidateCommand", "PayPal"))
{
var cart = Session["Cart"];
<div class="row">
    <div class="col-lg-9">
        <h2><strong>Courses</strong></h2><br />
        <div class="col-md-4 col-xs-6 col-s-8 col-lg-4">
        @foreach (var item in cart)
        {
            <img src="~/Images/party.gif" style="width: 175px" class="img-responsive" />
            <h2>@item.className</h2>
            <input type="text" name="product" value="@item.className" hidden="hidden" />
            <input type="text" name="totalPrice" value="@item.classPrice" hidden="hidden"  />
            <input type="text" name="custom" value="@item.ClassID" hidden="hidden" />
        }
        <br />
        </div>

    </div>
    <input class="btn btn-default" type="submit" name="btnConfirm" value="Check Out with Paypal" />

</div>
}

Answer 1

您似乎想要在购物车中收集订单商品。

要实现这一点，请执行类似的操作

public ActionResult ShoppingCart(string className, string classPrice, string classDesc)
{        
    Session["Cart"] = db.Orders.ToList();
    return View();
}

然后使用

var cart = Session["Cart"] as IEnumerable<Order>;

在您的 View 中访问这些项目