MVC 简便购物车

效果图：

（一）controlles

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using MvcApplication1.Models;
namespace MvcApplication1.Controllers

{
    
    public class ShopCartController : Controller
    {
        //
        // GET: /ShopCart/

        public ActionResult Index()//显示的主页面
        {
            if (Session["cart"] == null)//判断一下是否为空
            {
                ViewBag.Count = 0;
            }
            else
            {
                List<OrderDetails> temp = Session["cart"] as List<OrderDetails>;
                ViewBag.Count = temp.Count;
            }

            List<Fruit> list = new FruitBF().Select();
            return View(list);
        }
        public ActionResult ViewCart()//购物车的视图
        {
            if (Session["cart"] == null)
            {
                List<OrderDetails> temp = new List<OrderDetails>();
                Session["cart"] = temp;
            }

            List<OrderDetails> list = Session["cart"] as List<OrderDetails>;//判断一共花了多少钱
            decimal cost = list.Sum(p=>p.Count*p.FruitPrice).Value;//用水果的数量乘以水果的单价
            ViewBag.Sum = cost; 
            return View(list);
        }
     
        public ActionResult RemoveFromCart(string id)//删除
        {
            if (Session["cart"] == null)//当集合里没有数值的时候
            {
                List<OrderDetails> temp = new List<OrderDetails>();
                Session["cart"] = temp;
            }
            List<OrderDetails> list = Session["cart"] as List<OrderDetails>;

            var query = list.Where(p=>p.FruitCode == id);
            if (query.Count() > 0)//判断一下，如果里面有数值得话，就减去一个
            {
                OrderDetails data = query.First();
                if (data.Count > 1)
                {
                    data.Count--;
                }
                else
                {
                    list.Remove(data);
                }
                return RedirectToAction("ViewCart");//刷新一下新操作的页面
            }
            else
            {
                return RedirectToAction("ViewCart");
            }
        }
        public ActionResult Buy(string id)//购买
        {
            if (Session["cart"] == null)//点击购买上面累计一共买了几种水果
            {
                List<OrderDetails> temp = new List<OrderDetails>();
                Session["cart"] = temp;
            }
            List<OrderDetails> list = Session["cart"] as List<OrderDetails>;

            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++;
            }

            return RedirectToAction("Index");
        }
    }
}
（二） models

{1}fruitBF

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace MvcApplication1.Models
{
    public class FruitBF
    {
        private MyDBDataContext _Context = new MyDBDataContext();
        public List<Fruit> Select()
        {
            return _Context.Fruit.ToList();
        }
    }
}

{2} OrderDetails

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace MvcApplication1.Models
{
    public partial class OrderDetails
    {
        private MyDBDataContext _Context = new MyDBDataContext();
        public string FruitName
        {
            get
            {
                var query = _Context.Fruit.Where(p=>p.Ids == this.FruitCode);

                if (query.Count() > 0)
                {
                    return query.First().Name;
                }
                return "";
            }
        }
        public decimal FruitPrice
        {
            get
            {
                var query = _Context.Fruit.Where(p => p.Ids == this.FruitCode);

                if (query.Count() > 0)
                {
                    return query.First().Price.Value;
                }
                return 0;
            }
        }
    }
}

(三) views

<1> index--主页
@using MvcApplication1.Models;
@model List<Fruit>
@{
    Layout = null;
}

<!DOCTYPE html>

<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>Index</title>
</head>
<body>
    <div>
        <div>你已经购买了 @ViewBag.Count 个商品</div>
        <table width="100%" border="1" >
            @foreach(Fruit data in Model )
            {
            <tr>
                <td>@data.Name</td>
                <td>@data.Price</td>
                <td>@data.Numbers</td>
                <td>@Html.ActionLink("购买", "Buy", "ShopCart", new { id=data.Ids},null)</td>
            </tr>
            }
        </table>
        @Html.ActionLink("查看购物车","ViewCart");
    </div>
</body>
</html>

效果图：

<2> viewcart-- 购物车页面
@using MvcApplication1.Models;
@model List<OrderDetails>
@{
    Layout = null;
}

<!DOCTYPE html>

<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>ViewCart</title>
</head>
<body>
    <h1>查看购物车</h1>
    <div>
        <ul>
            @foreach(OrderDetails item in Model)
            {
            <li>
                @item.FruitName ( 购买数量：@item.Count 个  单价： @item.FruitPrice ) 
                @Html.ActionLink("删除", "RemoveFromCart", new { id= item.FruitCode})
            </li>
            }
        </ul>
        <font color="red">
            您一共购买了 @ViewBag.Sum 元的商品
        </font>
        @Html.ActionLink("提交订单","SubmitOrder")
    </div>
</body>
</html>

(四) 添加一个JS

效果图：