用 序列化,反序列化的购物车

      我是新手,这是我的第一个项目,开始做购物车也做的我头疼,后面还是慢慢搞出来了，代码也更新过两次,但是还是比较乱,也没办法,将就点慢慢来,
  这只是我的一个参考， 其他的新手看了这个应该会有更好的解决办法了，

    购物车操作类

    [Serializable]
    public class CartInfo
    {
        private IDBProductManager idbpro = ProductSystemFacade.GetFacade().GetIDBProductManager();
        private string procKey="";     //下定单的商品ID,数量参数值
        IList<Product> list = null;

        #region 购物车信息抛出的属性

        /// <summary>
        /// 购物车中所有商品原总邮费
        /// </summary>
        public int TotalOldPostMoney
        {
            get
            {
                int sum = 0;

                list = GetNewCartItems();
                foreach (Product item in list)
                {
                    int proID = item.Id;
                    Product product = idbpro.Read(proID);
                    sum += product.ProPost1 * item.ProNumber;
                }
                return sum;
            }
        }

        /// <summary>
        /// 购物中所有商品原来的价格合计
        /// </summary>
        public decimal TotalPrice
        {
            get
            {
                decimal sum = 0;

                list = GetNewCartItems();
                foreach (Product item in list)
                {
                    int proID = item.Id;
                    Product product = idbpro.Read(proID);
                    sum += ((product.ProPrice + product.ProPost1) * item.ProNumber);
                }
                return sum;
            }
        }

        /// <summary>
        /// 购物车所有商品打折后的价格总计
        /// </summary>
        public decimal TotalNewPrice
        {
            get
            {
                decimal sum = 0;

                list = GetNewCartItems();
                foreach (Product item in list)
                {
                    int proID = item.Id;
                    Product pro = idbpro.Read(proID);
                    sum += ((pro.ProPrice * pro.ProSpecialOffer + pro.ProPost1) * item.ProNumber);
                }
                return sum;
            }
        }

        /// <summary>
        /// 返回购物车里所有商品的数量
        /// </summary>
        public int TotalNum
        {
            get
            {
                int sum = 0;

                list = GetNewCartItems();
                foreach (Product item in list)
                {
                    sum += item.ProNumber;
                }
                return sum;
            }
        }

        /// <summary>
        /// 下定单传的ID,数量参数
        /// </summary>
        public string ProcKey
        {
            get
            {
                procKey = "";

                list = GetNewCartItems();
                foreach (Product item in list)
                {
                    int proID = item.Id;
                    int proNum = item.ProNumber;
                    procKey += proID.ToString() + "|" + proNum.ToString() + ",";
                }
                return procKey;
            }
        }

        //设置获取Cookie值
        private string CookieMsg
        {
            get
            {
                if (HttpContext.Current.Request.Cookies == null) return null;
                if (HttpContext.Current.Request.Cookies["cart"] == null) return null;
                return HttpContext.Current.Request.Cookies["cart"].Value;
            }
            set
            {
                if (HttpContext.Current.Response.Cookies == null)
                {
                    HttpCookie cookie = new HttpCookie("cart");
                    cookie.Expires = DateTime.Now.AddHours(24);   //保存序列化信息
                    HttpContext.Current.Response.Cookies.Set(cookie);
                }
                else
                {
                    HttpContext.Current.Response.Cookies["cart"].Values.Clear();
                    HttpContext.Current.Response.Cookies["cart"].Value = value;
                    HttpContext.Current.Response.Cookies["cart"].Expires = DateTime.Now.AddHours(24);   //保存序列化信息
                }
            }
        }

        #endregion

        #region 购物车的执行方法

        /// <summary>
        /// 添加商品
        /// </summary>
        /// <param name="proID">商品ID</param>
        public void AddItem(int proID)
        {
            list = GetNewCartItems();
            if (list.Count == 0)
            {
                list.Add(new Product(proID, 1));
            }
            else
            {
                bool b = false;
                foreach (Product pro in list)
                {
                    if (pro.Id == proID)
                    {
                        pro.ProNumber++;
                        b = true;
                        break;
                    }
                }
                if (b == false)
                {
                    list.Add(new Product(proID, 1));
                }
            }
            SerializeObj(list);        //序列化
        }

        /// <summary>
        /// 从购物车里移除某商品
        /// </summary>
        /// <param name="proID">商品ID</param>
        public void RemoveItem(int proID)
        {
            list = GetNewCartItems();

            for (int i = 0; i < list.Count; i++)
            {
                Product pro = (Product)list[i];
                if (pro.Id == proID)
                {
                    list.RemoveAt(i);
                }
            }
            SerializeObj(list);        //序列化
        }

        /// <summary>
        /// 修改购物车里某商品的数量
        /// </summary>
        /// <param name="ID">商品ID</param>
        /// <param name="Quantity">商品数量</param>
        public void UpdateItem(int proID, int Quantity)
        {
            bool b = false;

            list = GetNewCartItems();
            for (int i = 0; i < list.Count; i++)
            {
                Product item = (Product)list[i];
                if (proID == item.Id)
                {
                    if (Quantity != item.ProNumber)
                    {
                        item.ProNumber = Quantity;
                        b = true;
                        break;
                    }
                }
            }
            if (b == false) return;
            SerializeObj(list);        //序列化
        }

        /// <summary>
        /// 清空购物车
        /// </summary>
        public void ClearCart()
        {
            list = GetNewCartItems();

            list.Clear();
            SerializeObj(list);        //序列化  (5.12的随笔里有方法)
        }

        /// <summary>
        /// 重新序列化购物车信息
        /// </summary>
        /// <param name="cart"></param>
        public void SerializeObj(IList<Product> list)
        {
            string strCart = SerializeMsg.SerializeObject(list);        //序列化购物车信息对象
            CookieMsg = strCart;
        }
       
        /// <summary>
        /// 获取最新购物车记录
        /// </summary>
        /// <returns></returns>
        public IList<Product> GetNewCartItems()
        {
            string newMsg = CookieMsg;
            if (string.IsNullOrEmpty(newMsg))
            {
                return new List<Product>();
            }
            object obj = SerializeMsg.DeserializeObject(newMsg);     //反序列化购物车信息

            return (IList<Product>)obj;
        }

        /// <summary>
        /// 购物车商品信息的Ilist集合
        /// </summary>
        /// <param name="cartInfo"></param>
        /// <returns></returns>
        public IList<Product> GetShoppingCartList()
        {
            IList<Product> newList = new List<Product>();
            foreach (Product item in GetNewCartItems())
            {
                int proID = item.Id;
                int proNum = item.ProNumber;

                Product pro = idbpro.Read(proID);
                pro.ProNumber = proNum;
                newList.Add(pro);
            }
            return newList;
        }
       
        #endregion



购物车页面源代码
   在源代码里 我把常用的DataBinder.Eval(也可以简写Eval), 用 ((Product)Container.DataItem).属性名 来代替, 有效 的提高了绑定效率. 

<%@ Import Namespace="Plugins.ProductSystem.Domain" %>

 <div class="content-wrapper">
        <div class="top-tips">您已经选购以下商品</div><!-- end top-nav -->
  <div class="shopping-content">
  <table width="100%" border="0" cellspacing="0" cellpadding="0" class="shopping-list">
    <tr align="center" style="background:#eee">
        <td width="50%">商品名称</td>
        <td width="10%">市场价</td>
        <td width="15%">现价&nbsp;/&nbsp;单个商品运费</td>
        <td width="9%" align="right">数量</td>
        <td width="6%"></td>
        <td width="10%"></td>
    </tr>
    <asp:repeater id="rShoppingCart" Runat="server" OnItemCreated="rShoppingCart_ItemCreated">
    <ItemTemplate>
        <tr align="center" id='<%# "ShoppingCart_row_"+product.Id %>'>
            <td>
                <a href="/Product/ProductDetail.aspx?id=<%# product.Id %>" target="_blank"><%# Xnet.Common.Text.String.Left(product.ProName, 50)%></a>
            </td>
            <td>
                <label class="original-price"><%# string.Format("{0:C}",product.ProPrice) %></label>
            </td>
            <td>
                <label class="special-price"><%# string.Format("{0:C}", product.ProPrice * product.ProSpecialOffer)%>
            </label>&nbsp;&nbsp;/&nbsp;&nbsp;<span><%# string.Format("{0:C}", product.ProPost1)%></span>
            </td>
            <td align="right">
                <input type="text" id='<%# "ShoppingCart_row_txtproNumber" + product.Id %>' value='<%# product.ProNumber %>' style="width:30px;text-align:center" maxlength="4"
                onblur='<%# string.Format("ChangePro_number({0},this)",product.Id) %>'/>
            </td>
            <td align="center"><div id='<%# "divDisplayMsg_" + product.Id %>'></div></td>
            <td>
                <a style="cursor:pointer;" onclick='<%# string.Format("DeleteItem({0},this.parentNode.parentNode.id)",product.Id) %>'>删除</a>
            </td>
        </tr>
    </ItemTemplate>
    </asp:repeater>  </table>
  <div class="more-choice">
 <div class="more-choice-link">
     <a onclick="javascript:window.close()" style="cursor:pointer">继续挑选商品&gt;&gt;</a><br />
        <a href="#" target="_blank"></a>
    </div>
    你共节省：<label id="lbltotPrice" class="special-price" runat="server"/>&nbsp;&nbsp;&nbsp;&nbsp;|
    <h3>商品金额总计：</h3>总计:
    <label id="lblnewtotPrice" runat="server" class="special-price" />
    <asp:Button ID="EnterToPay" runat="server" class="btn-bill"  Text="结算" OnClick="EnterToPay_Click" />   
  </div><!-- end more-choice -->
</div><!-- end shopping-content -->

<div style="margin-top: 10px;">
 <input type="button" value="清空" class="choice-btn" onclick="ClearItems()" />
</div>

后台代码
 
        //数据绑定
        private void ShoppingCartBind()
        {
            try
            {
                GetCart();
                IList<Product> list = cart.GetNewCartItems();

                if (list != null)
                {
                    rShoppingCart.DataSource = cart.GetShoppingCartList();
                    rShoppingCart.DataBind();

                    lbltotPrice.InnerText = string.Format("{0:C}", cart.TotalPrice - cart.TotalNewPrice);
                    lblnewtotPrice.InnerText = string.Format("{0:C}", cart.TotalNewPrice);
                }
                else
                {
                    lbltotPrice.InnerText = string.Format("{0:C}", 0);
                    lblnewtotPrice.InnerText = string.Format("{0:C}", 0);
                }
            }
            catch (Exception ex)
            {
                Xnet.Common.WebUtils.MessageBox.Show(Page, ex.Message);
            }
        }

        //创建行事件
        protected Product product = null;
        protected void rShoppingCart_ItemCreated(object sender, RepeaterItemEventArgs e)
        {
            product = e.Item.DataItem as Product;
        }

JS代码

不过在用Cookie保存序列化信息时遇到个很严重的问题,就是说,我刚序列化对象到Cookie里， 接着取出来时,发现没能更新到最新数据,而是上一次信息,其实数据已经序列化到Cookie里了，这个问题我还没能解决,还得去找答案,用过Cookie和Session的结合应用,但是最后还是不理想...也许是我能力有限,js里的价格计算这个步骤原来是没必要的，但是受上面这个问题的影响,先这样。
 //更新购物车商品数量
    function ChangePro_number(id,obj)
    {
        if(isNaN(obj.value))
        {
            obj.value = 1;
        }
        else
        {
            var vali = /^0\d{0,4}$/.test(obj.value);
            if(vali)
            {
                obj.value = 1;
            }
        }
        var divDisplay = document.getElementById("divDisplayMsg_"+id);
       
        var result = OrderSystemCtrl.AjaxMsg.AjaxMethods.UpdateProductNum(id,obj.value);
        if(result != null)
        {
            var dt = result.value;
            if(dt != null)
            {
                if(parseInt(obj.value) == parseInt(dt[0]))
                {
                    divDisplay.innerHTML = "更新成功";
                }
                else
                {
                    divDisplay.innerHTML = "库存不足";
                }
                obj.value = dt[0];
                GetPrice();
            }
        }
        else
        {
            divDisplay.innerHTML = "更新失败";
            return;
        }
    }
   
    //删除购物车记录
    function DeleteItem(id,nodeName)
    {
        if(confirm("确定要删除该商品?"))
        {
            var result = OrderSystemCtrl.AjaxMsg.AjaxMethods.DeleteProduct(id);
            if(result != null)
            {
                if(result.value != null)
                {
                    if(result.value.toLowerCase() == "success")
                    {
                        var rowid = document.getElementById(nodeName);
                        if(rowid != null)
                        {
                            rowid.parentNode.removeChild(rowid);
                        }
                       
                        var dt = result.value;
                        GetPrice();
                    }
                    else
                    {
                        alert(result.value);
                    }
                }
            }
        }
    }
   
    //清空购物车
    function ClearItems()
    {
        if(confirm("确定要清空购物车所有的商品?"))
        {
            var result = OrderSystemCtrl.AjaxMsg.AjaxMethods.ClearProduct();
            if(result != null)
            {
                if(result.value != null)
                {
                    if(result.value.toLowerCase() == "success")
                    {
                        var cart = document.getElementsByTagName("TR");
                        if(cart != null && cart != "undefined")
                        {
                            var row = null;
                            var b = false;
                            for(var i=0; i<cart.length; i++)
                            {
                                row = cart[i];
                                if(row.id.indexOf("ShoppingCart_row_") > -1)
                                {
                                    b = true;
                                    break;
                                }
                            }
                            if(b == true)
                            {
                                var parent = row.parentNode;
                                for(var j=0; j<parent.childNodes.length-1; )
                                {  
                                    parent.removeChild(parent.childNodes[1]);
                                }
                            }
                            GetPrice();
                        }
                     }   
                     else
                     {
                        alert(result.value);
                     }
                 }
             }
        }
    }
   
    //计算价格
    function GetPrice()
    {
        var Row = document.getElementsByTagName("TR");
        if(Row != null && Row != "undefined")
        {
            var newString="";
            for(var i=0; i<Row.length; i++)
            {
                var row_i = Row[i];
                var row_id = row_i.id;
                if(row_id.indexOf("ShoppingCart_row_") > -1)
                {
                    var id = row_id.substr(17);
                    var proNumber_id = "ShoppingCart_row_txtproNumber"+id;
                    var num = document.getElementById(proNumber_id).value;
                    newString = newString + (id+'|'+num+',');
                }
            }
            var result = OrderSystemCtrl.AjaxMsg.AjaxMethods.GetFormatPrice(escape(newString));
            if(result != null)
            {
                var dt = result.value;
                var tot = document.getElementById("ctl00_ContentPlaceHolder1_ShoppingCart_lbltotPrice");
                var newtot = document.getElementById("ctl00_ContentPlaceHolder1_ShoppingCart_lblnewtotPrice");
                tot.innerHTML = dt[0];
                newtot.innerHTML = dt[1];
            }                    
        }
    }