最进在用Cookie的时候总是不顺,出现了一个实在让人不理解的问题:
当给Cookies赋值并设置过期时间后后再访问Cookie,没什么问题,包括访问他的键,和Cookie的数量都没问题。如下面的代码。
Response.Cookies["userInfo"]["userName"] = "mike";
Response.Cookies["userInfo"]["lastVisit"] = DateTime.Now.ToString();
Response.Cookies["userInfo"].Expires = DateTime.Now.AddDays(1);
Response.Cookies.Count;
string [] keys = Response.Cookies.AllKeys;
foreach(string key in keys )
{
Response.Write(key +"<br>");
}可是当指定的Cookie中已经有值了的时候,就是在第一次执行页面时发放了Cookie,当第二在执行这个页面时不会再发放Cookie值,而是访问第一次执行页面时所发放的Cookie的值。此时访问
Response.Cookies.Count;
Response.Cookies.AllKeys;
会出现问题,Count为0 ,AllKeys数组为空!而打开Cookie文件看,里面确实有值,而且是第一次执行页面是所发放的值。这里不知道为什么Count为0 ,AllKeys数组为空!?迷惑!
当给Cookies赋值并设置过期时间后后再访问Cookie,没什么问题,包括访问他的键,和Cookie的数量都没问题。如下面的代码。
Response.Cookies["userInfo"]["userName"] = "mike";
Response.Cookies["userInfo"]["lastVisit"] = DateTime.Now.ToString();
Response.Cookies["userInfo"].Expires = DateTime.Now.AddDays(1);
Response.Cookies.Count;
string [] keys = Response.Cookies.AllKeys;
foreach(string key in keys )
{
Response.Write(key +"<br>");
}可是当指定的Cookie中已经有值了的时候,就是在第一次执行页面时发放了Cookie,当第二在执行这个页面时不会再发放Cookie值,而是访问第一次执行页面时所发放的Cookie的值。此时访问
Response.Cookies.Count;
Response.Cookies.AllKeys;
会出现问题,Count为0 ,AllKeys数组为空!而打开Cookie文件看,里面确实有值,而且是第一次执行页面是所发放的值。这里不知道为什么Count为0 ,AllKeys数组为空!?迷惑!
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using KKZK.proc;namespace KKZK.Controls
{
public partial class cart : System.Web.UI.UserControl
{
protected void Page_Load(object sender, EventArgs e)
{
string pro_id = Request.QueryString["pro_id"];
if (pro_id != string.Empty && pro_id != null)
{
string sql = "select pro_id ,pro_name ,pro_price,pro_factory from Product where pro_id=" + int.Parse(pro_id);
DataTable table = SelectSouse(sql);
CookieCartSouse(table, pro_id);
} if (!IsPostBack)
{
Norms[] list = (Norms[])ShowCookieCart();
gv_cart.DataSource = list;
gv_cart.DataBind();
}
//productInfo();
} /// <summary>
/// 提取数据记录
/// </summary>
/// <param name="sql">SQL语句</param>
/// <returns>返回数据表对象</returns>
public DataTable SelectSouse(string sql)
{
DataTable table = (new Connect()).ReadByDataTable(sql);
return table;
} /// <summary>
/// 将提取的数据记录添加到二维Cookie数组中。
/// </summary>
/// <param name="table">数据表对象</param>
/// <param name="productId">第一维的变量</param>
public void CookieCartSouse(DataTable table, string productId)
{
//表示CookieCart里有商品
if (Response.Cookies.Count > 0)
{
//取得Cookie的键组
foreach (string key in Response.Cookies.AllKeys)
{
//Cookie的键与接收的商品的ID相同,将商品数量加一.
if (key == productId)
{
int num = int.Parse(Response.Cookies[productId]["pro_num"]) + 1;
Response.Cookies[productId]["pro_num"] = num.ToString();
return;
}
}
}
Response.Cookies[productId]["pro_id"] = table.Rows[0][0].ToString();
Response.Cookies[productId]["pro_name"] = table.Rows[0][1].ToString();
Response.Cookies[productId]["pro_num"] = "1";//商品购买的数量默认是1
Response.Cookies[productId]["pro_price"] = table.Rows[0][2].ToString();
Response.Cookies[productId]["pro_factory"] = table.Rows[0][3].ToString();
Response.Cookies[productId].Expires = DateTime.Now.AddDays(1);//设置过期时间
} /// <summary>
/// 读取Cookie中的值将其增加到ArrayList中
/// </summary>
/// <returns>返回Norms类属性数组</returns>
public Norms[] ShowCookieCart()
{
ArrayList arrList = new ArrayList();
if (Response.Cookies.Count > 0)
{
string[] strArray = Response.Cookies.AllKeys;
foreach (string key in strArray)
{
Norms nw = new Norms();
nw.pro_id = int.Parse(Response.Cookies[key]["pro_id"].ToString());
nw.pro_name = (string)Response.Cookies[key]["pro_name"].ToString();
nw.pro_num = int.Parse(Response.Cookies[key]["pro_num"].ToString());
nw.pro_price = float.Parse(Response.Cookies[key]["pro_price"].ToString());
nw.pro_up = float.Parse(Response.Cookies[key]["pro_price"].ToString()) * int.Parse(Response.Cookies[key]["pro_num"].ToString());
nw.pro_factory = (string)Response.Cookies[key]["pro_factory"].ToString();
arrList.Add(nw);
}
return (Norms[])arrList.ToArray(typeof(Norms));
}
return null;
} }
}