HashTable+Cookie实现购物车
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using System;
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using System.Collections.Generic;
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using System.Text;
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using System.Web;
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using System.Runtime.Serialization;
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using System.Runtime.Serialization.Formatters.Binary;
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using System.IO;
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using System.Collections;
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namespace Gtide.ShoppingMall.BLL
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{
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public class ShoppingCart
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{
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private Hashtable items = new Hashtable();
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private readonly string COOKIE_NAME = "shoppingcart";
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/// <summary>
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/// 往购物车加入一个新商品
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/// </summary>
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/// <param name="itemID">商品编号</param>
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public void Add(int itemID)
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{
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Load();
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if (items.ContainsKey(itemID))
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{
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items[itemID] = int.Parse(items[itemID].ToString()) + 1;
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}
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else
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{
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items.Add(itemID, 1);
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}
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Save();
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}
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/// <summary>
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/// 从购物车移除一个商品
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/// </summary>
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/// <param name="itemID"></param>
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public void Remove(int itemID)
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{
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Load();
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if (items.ContainsKey(itemID))
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{
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items.Remove(itemID);
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}
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Save();
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}
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/// <summary>
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/// 更新购物车指定商品数量
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/// </summary>
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/// <param name="itemID"></param>
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/// <param name="itemCount"></param>
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public void Update(int itemID, int itemCount)
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{
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Load();
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if (items.ContainsKey(itemID))
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{
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if (itemCount < 1)
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{
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itemCount = 1;
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}
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items[itemID] = itemCount;
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}
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Save();
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}
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public void Update(Hashtable hashTable)
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{
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Load();
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foreach (DictionaryEntry entry in hashTable)
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{
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int value = Convert.ToInt32(entry.Value);
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if (items.ContainsKey(Convert.ToInt32(entry.Key)))
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{
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if (value < 1)
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{
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value = 1;
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}
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items[Convert.ToInt32(entry.Key)] = value;
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}
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}
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Save();
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}
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/// <summary>
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/// 保存购物车
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/// </summary>
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private void Save()
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{
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string val = null;
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foreach (DictionaryEntry entry in items)
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{
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val += entry.Key.ToString() + "|" + entry.Value.ToString() + "@";
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}
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HttpCookie myCookie = new HttpCookie(COOKIE_NAME, val);
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myCookie.Expires = DateTime.Now.AddDays(1);
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HttpContext.Current.Response.Cookies.Add(myCookie);
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}
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/// <summary>
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/// 加载购物车
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/// </summary>
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private void Load()
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{
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HttpCookie myCookie = HttpContext.Current.Request.Cookies[COOKIE_NAME];
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if (myCookie != null)
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{
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string val = myCookie.Value;
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string[] temp = val.Split(new char[] { '@' }, StringSplitOptions.RemoveEmptyEntries);
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foreach (string s in temp)
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{
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string[] tmp = s.Split(new char[] { '|' }, StringSplitOptions.RemoveEmptyEntries);
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int key = int.Parse(tmp[0]);
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int value = int.Parse(tmp[1]);
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items.Add(key, value);
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}
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}
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}
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/// <summary>
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/// 返回购物车列表
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/// </summary>
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/// <returns></returns>
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public List<Gtide.ShoppingMall.Model.ShoppingCart> GetList()
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{
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List<Gtide.ShoppingMall.Model.ShoppingCart> list = new List<Gtide.ShoppingMall.Model.ShoppingCart>();
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// 加载
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Load();
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// 商品数据层
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Gtide.ShoppingMall.DAL.ShoppingCart dal = new Gtide.ShoppingMall.DAL.ShoppingCart();
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foreach (DictionaryEntry entry in items)
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{
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Gtide.ShoppingMall.Model.ShoppingCart model = dal.GetList((int)entry.Key);
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model.Quantity = (int)entry.Value;
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list.Add(model);
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}
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return list;
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}
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清空购物车
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}
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}
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