MVC 购物车

数据结构

Models

public class FruitBF
    {
        private MyDbDataContext Context = new MyDbDataContext();

        public List<Fruit> Select()
        {
            return Context.Fruit.ToList();
        }
    }

HomeController

 public class HomeController : Controller
    {
        //
        // GET: /Home/

        public ActionResult Index()
        {
            if (Session["Cart"]==null)
            {
                ViewBag.Count = 0;
　　　　　　　　　 ViewBag.nubms = 0;
            }
            else
            {
                List<OrderDetails> list = Session["Cart"] as List<OrderDetails>;
                ViewBag.Count = list.Count;

　　　　　　　　　　int nubs = (int)list.Sum(p => p.Count);
　　　　　　　　　　ViewBag.nubms = nubs;


            }

            List<Fruit> listF = new FruitBF().Select();

            return View(listF);
        }

        public ActionResult Buy(string id)
        {
            //先判断Session["Cart"]是否为空，如果为空就是还没买，就先造一个集合赋给Session["Cart"]，然后再把Session["Cart"]中的集合取出来，对集合操作等于对Session["Cart"]进行操作
            if (Session["Cart"]==null)
            {
                List<OrderDetails> listOrder = new List<OrderDetails>();
                Session["Cart"] = listOrder;
            }
            List<OrderDetails> list = Session["Cart"] as List<OrderDetails>;

            //查看Session["Cart"]中有没有这个水果，如果没有就添加进来一个，有就Count加一
            var query = list.Where(p=>p.FruitCode==id);
            if (query.Count()<=0)
            {
                OrderDetails data = new OrderDetails();
                data.FruitCode = id;
                data.Count = 1;
                list.Add(data);
            }
            else
            {
                OrderDetails data = query.First();
                data.Count += 1;
            }

            return RedirectToAction("Index");
        }

        public ActionResult ViewCart(string id)
        {
            if (Session["Cart"] == null)
            {
                List<OrderDetails> listOrder = new List<OrderDetails>();
                Session["Cart"] = listOrder;
            }
            List<OrderDetails> list = Session["Cart"] as List<OrderDetails>;
            //计算商品总价，计算每个对象的单价*数量，累加
            decimal cost = list.Sum(p => p.Count * p.FruitPrice).Value;
            ViewBag.Sum = cost; 
            return View(list);
        }

        public ActionResult RemoveFCart(string id)
        {
            if (Session["Cart"] == null)
            {
                List<OrderDetails> listOrder = new List<OrderDetails>();
                Session["Cart"] = listOrder;
            }
            List<OrderDetails> list = Session["Cart"] as List<OrderDetails>;

            var query = list.Where(p=>p.FruitCode==id);
            //判断Session["Cart"]中对象个数。有且Count大于1，就把对象的Count减1；否则的话就把对象移除
            if (query.Count()>0)
            {
                OrderDetails data = query.First();
                if (data.Count >1)
                {
                    data.Count -= 1;
                }
                else
                {
                    list.Remove(data);
                }               
            }
            else
            {
                return RedirectToAction("ViewCart");
            }
            return RedirectToAction("ViewCart");
        }

        //清空购物车
        public ActionResult kong()
        {
            if (Session["Cart"] != null)
            {
                Session["Cart"] = null;
            }
            return RedirectToAction("Index");
        }
    }

Index

@{
    Layout = null;
}
@using MvcApplication2.Models;
@model List<Fruit>
<!DOCTYPE html>

<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>Index</title>
    <style>
        .tb {
        text-align:center;
        background-color:#ffffcc;
        width:100%;
        }
    </style>
    
</head>
<body>
    <div>
        <table class="tb" cellpadding="4" cellspacing="1" border="0">
            <tr style="background-color:#ccffff">
                <td colspan="4">您已经购买了 @ViewBag.Count 种商品--总数量为 @ViewBag.nubms 个</td>
            </tr>
            <tr>
                <td>商品名</td>
                <td>单价</td>
                <td>库存量</td>
                <td>操作</td>
            </tr>
            @{
                foreach (Fruit f in Model)
                {
                <tr>
                    <td>@f.Name</td>
                    <td>@f.Price</td>
                    <td id="fns">@f.Numbers</td>
                    <td>@Html.ActionLink("购买", "Buy", "Home", new { id = f.Ids }, null)</td>
                </tr>
                }
            }
            <tr style="background-color: #ccffff">
                <td colspan="4">@Html.ActionLink("查看购物车","ViewCart","Home")  @Html.ActionLink("清空购物车","kong","Home")
                </td>
            </tr>
        </table>
    </div>
</body>
</html>

ViewCart

@using MvcApplication2.Models;
@model List<OrderDetails>
@{
    Layout = null;
}

<!DOCTYPE html>

<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>ViewCart</title>
    <style>
        .tb {
        text-align:center;
        width:100%;
        background-color:#ffffcc;
        }
    </style>
</head>
<body>
    <div>
        <table class="tb" cellspacing="1" cellpadding="4" border="0">
            <tr style="background-color: #ccffff">
                <td colspan="4">
                    <h2>查看购物车</h2>
                </td>
            </tr>
            <tr>
                <td>商品名</td>
                <td>购买数量</td>
                <td>单价</td>
                <td>操作</td>
            </tr>
            @{
                foreach (OrderDetails data in Model)
                {
                <tr>
                    <td>@data.FruitName</td>
                    <td>@data.Count</td>
                    <td>@data.FruitPrice</td>
                    <td>@Html.ActionLink("删除", "RemoveFCart", "Home", new { id=data.FruitCode },null)</td>
                </tr>
                }
            }
            <tr style="background-color: #ccffff">
                <td colspan="4">您一共消费了 @ViewBag.Sum 元</td>
            </tr>
            <tr>
                <td colspan="4">
                    @using (@Html.BeginForm("Index","Home",FormMethod.Post))
                    {
                    <input type="submit" value="回到主页" />
                    }
                </td>
            </tr>
        </table>
    </div>
</body>
</html>

运行效果：