HashTable+Cookie实现购物车

  1using System;
  2using System.Collections.Generic;
  3using System.Text;
  4using System.Web;
  5using System.Runtime.Serialization;
  6using System.Runtime.Serialization.Formatters.Binary;
  7using System.IO;
  8using System.Collections;
  9
 10namespace Gtide.ShoppingMall.BLL
 11{
 12    public class ShoppingCart
 13    {
 14        private Hashtable items = new Hashtable();
 15
 16        private readonly string COOKIE_NAME = "shoppingcart";
 17        /**//// <summary>
 18        /// 往购物车加入一个新商品
 19        /// </summary>
 20        /// <param name="itemID">商品编号</param>
 21        public void Add(int itemID)
 22        {
 23            Load();
 24
 25            if (items.ContainsKey(itemID))
 26            {
 27                items[itemID] = int.Parse(items[itemID].ToString()) + 1;
 28            }
 29            else
 30            {
 31                items.Add(itemID, 1);
 32            }
 33
 34            Save();
 35        }
 36
 37        /**//// <summary>
 38        /// 从购物车移除一个商品
 39        /// </summary>
 40        /// <param name="itemID"></param>
 41        public void Remove(int itemID)
 42        {
 43            Load();
 44
 45            if (items.ContainsKey(itemID))
 46            {
 47                items.Remove(itemID);
 48            }
 49
 50            Save();
 51        }
 52
 53        /**//// <summary>
 54        /// 更新购物车指定商品数量
 55        /// </summary>
 56        /// <param name="itemID"></param>
 57        /// <param name="itemCount"></param>
 58        public void Update(int itemID, int itemCount)
 59        {
 60            Load();
 61
 62            if (items.ContainsKey(itemID))
 63            {
 64                if (itemCount < 1)
 65                {
 66                    itemCount = 1;
 67                }
 68
 69                items[itemID] = itemCount;
 70            }
 71
 72            Save();
 73        }
 74
 75        public void Update(Hashtable hashTable)
 76        {
 77            Load();
 78
 79            foreach (DictionaryEntry entry in hashTable)
 80            {
 81                int value = Convert.ToInt32(entry.Value);
 82                if (items.ContainsKey(Convert.ToInt32(entry.Key)))
 83                {
 84                    if (value < 1)
 85                    {
 86                        value = 1;
 87                    }
 88
 89                    items[Convert.ToInt32(entry.Key)] = value;
 90                }
 91            }
 92
 93            Save();
 94        }
 95
 96        /**//// <summary>
 97        /// 保存购物车
 98        /// </summary>
 99        private void Save()
100        {
101            string val = null;
102
103            foreach (DictionaryEntry entry in items)
104            {
105                val += entry.Key.ToString() + "|" + entry.Value.ToString() + "@";
106            }
107
108            HttpCookie myCookie = new HttpCookie(COOKIE_NAME, val);
109            myCookie.Expires = DateTime.Now.AddDays(1);
110
111            HttpContext.Current.Response.Cookies.Add(myCookie);
112        }
113
114        /**//// <summary>
115        /// 加载购物车
116        /// </summary>
117        private void Load()
118        {
119            HttpCookie myCookie = HttpContext.Current.Request.Cookies[COOKIE_NAME];
120
121            if (myCookie != null)
122            {
123                string val = myCookie.Value;
124
125                string[] temp = val.Split(new char[] { '@' }, StringSplitOptions.RemoveEmptyEntries);
126                foreach (string s in temp)
127                {
128                    string[] tmp = s.Split(new char[] { '|' }, StringSplitOptions.RemoveEmptyEntries);
129                    int key = int.Parse(tmp[0]);
130                    int value = int.Parse(tmp[1]);
131                    items.Add(key, value);
132                }
133            }
134        }
135
136        /**//// <summary>
137        /// 返回购物车列表
138        /// </summary>
139        /// <returns></returns>
140        public List<Gtide.ShoppingMall.Model.ShoppingCart> GetList()
141        {
142            List<Gtide.ShoppingMall.Model.ShoppingCart> list = new List<Gtide.ShoppingMall.Model.ShoppingCart>();
143            // 加载
144            Load();
145
146            // 商品数据层
147            Gtide.ShoppingMall.DAL.ShoppingCart dal = new Gtide.ShoppingMall.DAL.ShoppingCart();
148
149            foreach (DictionaryEntry entry in items)
150            {              
151                Gtide.ShoppingMall.Model.ShoppingCart model  = dal.GetList((int)entry.Key);
152
153                model.Quantity = (int)entry.Value;
154
155                list.Add(model);
156            }
157
158            return list;
159        }
160
161
162        清空购物车#region 清空购物车
163        
164        public void Clear()
165        {
166            HttpCookie myCookie = HttpContext.Current.Response.Cookies[COOKIE_NAME];
167            myCookie.Expires = DateTime.Now.AddDays(-1);
168            HttpContext.Current.Response.Cookies.Add(myCookie);
169        }
170
171        #endregion
172    }
173}
174
175