100分救急啊！！cookie购物车问题
当A用户在自己电脑上访问此购物网站，将商品添加到购物车中后，没提交订单，也没清空购物车，此时B用户也用自己电脑访问此购物网站，也将商品添加到购物车中 ，但是此时B的购物车中有A用户购物车的商品，这是怎么回事啊？貌似购物车是公用的？求解，下面贴代码
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using System.Web;
using bldxw.DAL;
namespace bldxw.BLL
{
public class ShopCar
{
public static DataTable dt;
/// <summary>
/// 创建虚拟表
/// </summary>
protected void BuildDataTables()
{
dt = new DataTable("Product");//新建一张商品表，表名为"Product"
dt.Columns.Add(new DataColumn("ProductID")); //商品编号
dt.Columns.Add(new DataColumn("GoodsImageUrl"));//商品图片
dt.Columns.Add(new DataColumn("ProductName")); //商品名称
dt.Columns.Add(new DataColumn("Size")); //商品尺码
dt.Columns.Add(new DataColumn("quantity")); //购买数量
dt.Columns.Add(new DataColumn("totalPrice")); //商品总价
dt.Columns.Add(new DataColumn("Price")); //商品单价
dt.PrimaryKey = new DataColumn[] { dt.Columns["ProductID"] }; //设置主键为ProductID
}
/// <summary>
/// 查询购物车中的商品
/// </summary>
public DataTable GetProduct()
{
//判断cookie中是否存在数据
if (HttpContext.Current.Request.Cookies["ShoppingCart"].Value=="")
{
if (dt == null)
{
//如果虚拟表不存在则创建一个空的虚拟表
BuildDataTables();
}
}
else
{
//如果cookie中存在数据则从cookie中加载数据到购物车
ReadCookie();
}
return dt;
}
/// <summary>
/// 往虚拟表中添加数据
/// </summary>
/// <param name="ProductID">商品编号</param>
/// <param name="Quantity">购买数量</param>
public void AddDatatable(int ProductID, int Quantity, string Size)
{
//按照产品编号查询所有产品信息
DBHelp db = new DBHelp();
DataTable dtt = db.OpenDT("select chanpin.chanpinName,chanpin.jiage ,image.img17,pinpai.pinpaiName,dalei.daleiName,xiaolei.xiaoleiName from chanpin,dalei,xiaolei,pinpai,image where(chanpin.pinpaiID=pinpai.pinpaiID and chanpin.daleiID=dalei.daleiID and chanpin.xiaoleiID=xiaolei.xiaoleiID and chanpin.imgID=image.imgID)and chanpin.chanpinID='" + ProductID + "'");
// product prod = new ProductInfo().GetProductByProductId(ProductID)[0];
//新建一行数据
DataRow dr = dt.NewRow();
dr["ProductID"] = ProductID;
dr["GoodsImageUrl"] = dtt.Rows[0]["img17"];
dr["Size"] = Size;
dr["ProductName"] =Convert.ToString( dtt.Rows[0]["pinpaiName"])+Convert.ToString( dtt.Rows[0]["daleiName"])+Convert.ToString( dtt.Rows[0]["xiaoleiName"]);
dr["quantity"] = Quantity;
dr["Price"] = dtt.Rows[0]["jiage"];
dr["totalPrice"] = Quantity *Convert.ToInt32(dtt.Rows[0]["jiage"]);
//将这一行数据添加到虚拟表中
dt.Rows.Add(dr);
}
/// <summary>
/// 添加商品到购物车
/// </summary>
/// <param name="ProductID">商品编号</param>
/// <param name="Quantity">数量</param>
public bool AddProduct(int ProductID, int Quantity, string Size)
{
if (dt == null)
{
BuildDataTables(); //如果不存在虚拟表为空则创建一个空的虚拟表
}
try
{
DataRow row = dt.Rows.Find(ProductID);//根据商品编号查找商品所在虚拟表中的行
if (row == null)
{
//如果在虚拟表中找不到商品，则添加新的行
AddDatatable(ProductID, Quantity,Size);
WriteInCookie();
}
else
{
//如果找到了商品，则在原来商品基础上增加购买数量
row["Quantity"] = Convert.ToUInt32(row["Quantity"]) + Quantity;
row["totalPrice"] = decimal.Parse(row["Quantity"].ToString()) * decimal.Parse(row["Price"].ToString());
WriteInCookie();
}
return true;
}
catch
{
return false;
}
}
/// <summary>
///按照商品编号删除商品信息
/// </summary>
/// <param name="ProductID">商品编号</param>
public bool DeleteProductByProductID(int ProductID)
{
try
{
DataRow rows = dt.Rows.Find(ProductID);
dt.Rows.Remove(rows);
WriteInCookie();
return true;
}
catch
{
return false;
}
}
/// <summary>
/// 清空购物车
/// </summary>
/// <returns></returns>
public bool AllDeleteProduct()
{
try
{
dt.Clear();
WriteInCookie();
return true;
}
catch
{
return false;
}
}
/// <summary>
/// 按照商品编号修改商品数量
/// </summary>
/// <param name="ProductID">商品编号</param>
/// <param name="Quantity">购买数量</param>
public bool UpdateProductByProductID(int ProductID, int Quantity)
{
try
{
DataRow rows = dt.Rows.Find(ProductID);
rows["quantity"] = Quantity;
rows["totalPrice"] = Quantity * decimal.Parse(rows["Price"].ToString());
WriteInCookie();
return true;
}
catch
{
return false;
}
}
/* protected string RandomStr(int RndNumCount)
{
string RandomStr;
RandomStr = "";
Random Rnd = new Random();
for (int i = 1; i <= RndNumCount; i++)
{
RandomStr += Rnd.Next(1000, 9999).ToString();
}
return RandomStr;
}*/
/// <summary>
/// 把虚拟表中的商品编号和购买数量转换成字符串并写入cookie
/// </summary>
protected void WriteInCookie()
{
string str = "";
foreach (DataRow row in dt.Rows)
{
str = row["ProductID"] + "|" + row["quantity"] + "|" + row["Size"] + "," + str;
}
str = str.TrimEnd(',');
//往购物车中添加商品
HttpCookie aCookie = null;
if (HttpContext.Current.Request.Cookies["ShoppingCart"] == null)
{
//如果Cookies中不存在ShoppingCart，则创建
aCookie = new HttpCookie("ShoppingCart");
}
else
{
//如果Cookies中存在ShoppingCart，则清空
aCookie = HttpContext.Current.Request.Cookies["ShoppingCart"];
aCookie.Value =null;
}
aCookie.Value = str;
aCookie.Expires = DateTime.Now.AddHours(1);
HttpContext.Current.Response.Cookies.Add(aCookie);
}
/// <summary>
/// 从cookie中取出数据填充到虚拟表中
/// </summary>
protected void ReadCookie()
{
if (HttpContext.Current.Request.Cookies["ShoppingCart"] != null)
{
dt = null;
BuildDataTables();
//如果Cookies中存在ShoppingCart，则取出数据添加到Datatable中
HttpCookie aCookie = HttpContext.Current.Request.Cookies["ShoppingCart"];
string cart = aCookie.Value;
string[] arr = cart.Split(',');
for (int i = 0; i < arr.Length; i++)
{
string[] str = arr[i].Split('|');
AddDatatable(Convert.ToInt32(str[0]), Convert.ToInt32(str[1]),str[2]);
}
}
}
}
}
[解决办法]
建议你还是直接把购物车存数据库吧。
[解决办法]
学习了学习了
[解决办法]
