Cookie+DataList实现购物车

分享是一种美德

--（1）下面是购物车类

namespace XR.Web
{
    using System;
    using System.Collections.Generic;
    using System.Text;
    using System.Data;
    using System.Web;
    public class CookieShoppingCart
    {
        public CookieShoppingCart()
        {

        }
        /// <summary>
        /// 将商品信息添加到购物篮
        /// </summary>
        /// <param name="ProductID">商品编号</param>
        /// <param name="Amount">数量</param>
        public static void AddShoppingCart(int ProductID, int Amount)
        {
            if (HttpContext.Current.Request.Cookies["ShoppingCart"] == null)
            {
                HttpCookie MyCookies = new HttpCookie("ShoppingCart");
                MyCookies.Expires.AddDays(1);
                MyCookies.Value = ProductID.ToString() + "*" + Amount.ToString();
                HttpContext.Current.Response.Cookies.Add(MyCookies);
            }
            else
            {
                bool bExists = false;
                char[] sep = { ',' };
                HttpCookie MyCookie = (HttpCookie)HttpContext.Current.Request.Cookies["ShoppingCart"];

                MyCookie.Expires = DateTime.Now.AddDays(1);

                string sProdID = MyCookie.Value.ToString();

                string[] arrCookie = sProdID.Split(sep);
                //查看cookie中是否有该产品
                string newCookie = "";
                for (int i = 0; i < arrCookie.Length; i++)
                {
                    //
                    if (arrCookie[i].Length != 0)
                    {
                        if (arrCookie[i].Trim().Remove(arrCookie[i].IndexOf('*')) == ProductID.ToString().Trim())
                        {
                            bExists = true;
                            //得到数量
                            string amountStr = arrCookie[i].Trim().Substring(arrCookie[i].Trim().IndexOf('*') + 1);
                            amountStr = (Convert.ToInt32(amountStr) + Amount).ToString();
                            arrCookie[i] = arrCookie[i].Trim().Remove(arrCookie[i].IndexOf('*')) + "*" + amountStr;
                            newCookie = newCookie + "," + arrCookie[i];
                        }
                        else
                        {
                            newCookie = newCookie + "," + arrCookie[i];
                        }
                    }

                }

                if (!bExists)
                {
                    if (MyCookie.Value.Length == 0)
                    {
                        MyCookie.Value = ProductID.ToString() + "*" + Amount.ToString();
                    }
                    else
                    {
                        MyCookie.Value = MyCookie.Value + "," + ProductID.ToString() + "*" + Amount.ToString();
                    }
                }
                else
                {
                    MyCookie.Value = newCookie.Substring(1);
                }

                HttpContext.Current.Response.Cookies.Add(MyCookie);

            }
        }
        /// <summary>
        /// 删除相应产品
        /// </summary>
        /// <param name="ProductID"></param>
        /// <returns></returns>
        public static int RemoveShoppingCart(int ProductID)
        {
            int CookiesTotal = 0;
            int Result = 0;
            if (HttpContext.Current.Request.Cookies["ShoppingCart"] == null)
            {
                
            }
            else
            {
                try
                {
                    HttpCookie oCookie = (HttpCookie)HttpContext.Current.Request.Cookies["ShoppingCart"];
                    CookiesTotal = oCookie.Value.Length;
                    //Set Cookie to expire in 3 hours
                    char[] sep = { ',' };
                    oCookie.Expires = DateTime.Now.AddHours(6);
                    //Check if Cookie already contain same item
                    string sProdID = oCookie.Value.ToString();

                    string[] arrCookie = sProdID.Split(sep);
                    string[] arrCookie2 = new string[arrCookie.Length - 1];
                    int j = 0;
                    for (int i = 0; i < arrCookie.Length; i++)
                    {
                        if (arrCookie[i].Trim().Remove(arrCookie[i].IndexOf('*')) != ProductID.ToString())
                        {
                            arrCookie2[j] = arrCookie[i];
                            j++;
                        }
                    }
                    string sCookieID = "";
                    for (int i = 0; i < arrCookie2.Length; i++)
                    {
                        sCookieID = sCookieID + arrCookie2[i] + ",";
                    }
                    if (sCookieID.Length > 0)
                    {
                        oCookie.Value = sCookieID.Substring(0, sCookieID.Length - 1);
                    }
                    else
                    {
                        oCookie.Value = "";
                    }

                    HttpContext.Current.Response.Cookies.Add(oCookie);
                    if (oCookie.Value.Length < CookiesTotal)
                    {
                        Result = 1;

                    }
                    else
                    {

                    }
                }
                catch
                {
                    Console.WriteLine("正在处理...");
                }
            }
            return Result;
        }
        /// <summary>
        /// 更新产品的数量
        /// </summary>
        /// <param name="ProductID"></param>
        /// <param name="Account"></param>
        /// <returns></returns>
        public static int UpdateShoppingCart(int ProductID, int Account)
        {
            int Results = 0;
            HttpCookie MyCookie = (HttpCookie)HttpContext.Current.Request.Cookies["ShoppingCart"];
            int OldAccount = 0;
            string[] strCookie = MyCookie.Value.Split(',');
            string newCookie = "";
            if (strCookie.Length != 0)
            {
                for (int i = 0; i < strCookie.Length; i++)
                {
                    if (strCookie[i].Trim().Remove(strCookie[i].IndexOf('*')) == ProductID.ToString())
                    { 
                        OldAccount = int.Parse(strCookie[i].Trim().Substring(strCookie[i].IndexOf('*') + 1).ToString());
                        strCookie[i] = ProductID.ToString() + '*' + Account.ToString();
                        newCookie = newCookie + "," + strCookie[i];
                    }
                    else
                    {
                      newCookie=newCookie+","+strCookie[i];
                    }
                }
            }
             MyCookie.Value = newCookie.Substring(1);
             HttpContext.Current.Response.Cookies.Add(MyCookie);
             if (OldAccount != Account)
             {
                 Results = 1;
             }
             return Results;
        }
    }
}

--(2)商品的更新删除,页面

<script runat="server">
    DataTable Mytable = new DataTable();
     
    ProductBLL ProductInfo = new ProductBLL(); 
    protected decimal Total = 0;
    protected string Member = string.Empty;
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            BindData();
        }
     
    }
    private void BindData()
    {
        if (Request.Cookies["ShoppingCart"] != null)
        {
            HttpCookie oCookie = (HttpCookie)Request.Cookies["ShoppingCart"];
            string sProductID = oCookie.Value.ToString();
            if (sProductID.Length == 0)
            {
              
            }
            else
            {
                char[] sep = { ',' };
                string[] sArrProdID = sProductID.Split(sep);

                DataTable dt = new DataTable();
                dt.Columns.Add(new DataColumn("ID"));
                dt.Columns.Add(new DataColumn("Title"));
                dt.Columns.Add(new DataColumn("Total"));
                dt.Columns.Add(new DataColumn("price"));
                dt.Columns.Add(new DataColumn("PictureUrl"));

                int counter = 1;
                for (int i = 0; i < sArrProdID.Length; i++)
                {
                    DataTable DT = ProductInfo.GetDataByID(Convert.ToInt32(sArrProdID[i].ToString().Remove(sArrProdID[i].IndexOf('*'))), "laozhuangProduct");
                    DataRow dr = dt.NewRow();
                    dr["ID"] = sArrProdID[i].Remove(sArrProdID[i].IndexOf('*'));
                    dr["Title"] = DT.Rows[0]["Title"].ToString();
                    dr["Total"] = sArrProdID[i].Substring(sArrProdID[i].IndexOf('*') + 1);
                    dr["price"] = DT.Rows[0]["Keyword"].ToString();
                    int total=int.Parse(sArrProdID[i].Substring(sArrProdID[i].IndexOf('*') + 1));
                    decimal price = Convert.ToDecimal(DT.Rows[0]["Keyword"].ToString());

                    Total += Convert.ToDecimal(total * price);
                    dr["PictureUrl"] = DT.Rows[0]["PictureUrl"].ToString();
                    dt.Rows.Add(dr);
                    counter++;
                }

                DataList1.DataSource = dt;
                DataList1.DataBind();
            }
        }
    }

    protected void DataList1_DeleteCommand(object source, DataListCommandEventArgs e)
    {
        int PID = int.Parse(e.CommandArgument.ToString());
        if (CookieShoppingCart.RemoveShoppingCart(PID) > 0)
        {
            JS.AlertMsg("删除成功！", this.Page);
        }
        else
        {
            JS.AlertMsg("删除失败！", this.Page);
        }
        BindData();
    }
    public void UpdateShopping(int ProductID, string Acount)
    {
       
        CookieShoppingCart.UpdateShoppingCart(ProductID, int.Parse(Acount));
    }
    protected void TextBox1_TextChanged(object sender, EventArgs e)
    {
        TextBox myTextBox = (TextBox)sender;
        //获得所选行号 
        int index = Convert.ToInt32(((DataListItem)(myTextBox.NamingContainer)).ItemIndex);
        //编号
        string Num = ((Label)DataList1.Items[index].FindControl("Label1")).Text;
        //数量
        string Acount = ((TextBox)DataList1.Items[index].FindControl("TextBox1")).Text;

        if (CookieShoppingCart.UpdateShoppingCart(int.Parse(Num), int.Parse(Acount)) > 0)
        {
            JS.AlertMsg("更新成功！", this.Page);
        }
        BindData();
    }