Controllers/CartController.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using MvcShopping.Models;
using System.Net;

namespace MvcShopping.Controllers
{
    public class CartController : Controller
    {
        private MvcShopContext db = new MvcShopContext();
        private List<Cart> carts
        {
            get {
                if (Session["carts"] == null)
                {
                    Session["carts"] = new List<Cart>();
                }
                return (Session["carts"] as List<Cart>);
            }
            set { Session["carts"] = value; }
        }

        // GET: Cart
        public ActionResult Index()
        {
            return View(this.carts);
        }

        //[HttpPost]
        //public ActionResult DeleteUser()
        //{
        //    //省略操作部分
        //    return JavaScript("alert('删除成功')");
        //}


        [HttpPost]
        public ActionResult AddToCart(int ProductId,int Amount = 1)
        {
            var product = db.Products.Find(ProductId);
            if (product == null)
                return HttpNotFound();
            var cart_exists = this.carts.Where(x => x.Product.Id == ProductId).FirstOrDefault();
            if (cart_exists != null)
                cart_exists.Amount += Amount;
            else
                this.carts.Add(new Cart() { Product = product, Amount = Amount });
            return new HttpStatusCodeResult(HttpStatusCode.Created);
        }

        [HttpPost]
        public ActionResult Remove(int ProductId)
        {
            var product = this.carts.FirstOrDefault(x => x.Product.Id == ProductId);
            if (product != null)
            {
                this.carts.Remove(product);