一个商城的购车相关代码

这是我一个电子商城项目的一段代码,拿出来与大家分亨,有什么不正确的地方请大家给指出来.

购物车类

using System;
using System.Web.UI;
using System.Collections; //使用Hashtable类必须引入该命名空间
namespace EWang.BLL
{
    [Serializable]
    //定义商品类,保存商品的各种属性
    public class CarData
    {
        long _pid;
        int _quality;
        decimal _price;
        string _chicun;
        string _bianhao;
        public long P_ID
        {
            set { _pid = value; }
            get { return _pid; }
        }
        public int Quality
        {
            set { _quality = value; }
            get { return _quality; }
        }
        public decimal Price
        {
            set { _price = value; }
            get { return _price; }
        }
        public string ChiCun
        {
            set { _chicun = value; }
            get { return _chicun; }
        }
        public string BianHao
        {
            set { _bianhao = value; }
            get { return _bianhao; }
        }
        public CarData(long pid, int qua, decimal price,string chicun,string bianhao)  //构造方法，初始化商品的各个属性
        {
            _pid = pid;
            _quality = qua;
            _price = price;
            _chicun = chicun;
            _bianhao = bianhao;
        }
    }
   
    [Serializable]
    public class ShoppingCart
    {

        Hashtable Cart_Orders = new Hashtable();

        public ICollection Orders
        {
            get { return Cart_Orders.Values; }

        }
        /// <summary>
        /// 所有商品编号列表
        /// </summary>
        public string OrdersPidList
        {
            get
            {
                int flag = 0;
                System.Text.StringBuilder strprolist = new System.Text.StringBuilder();
                foreach (DictionaryEntry entry in Cart_Orders)
                {
                    CarData order = (CarData)entry.Value;
                    if (flag == 0)
                    {
                        strprolist.Append(order.P_ID);
                        flag = 1;
                    }
                    else
                    {
                        strprolist.Append("|" + order.P_ID);
                    }
                }
                return strprolist.ToString();
            }
        }
        public string OrdersList
        {
            get
            {
                int flag = 0;
                System.Text.StringBuilder strprolist = new System.Text.StringBuilder();
                foreach (DictionaryEntry entry in Cart_Orders)
                {
                     CarData order = (CarData)entry.Value;
                     if (flag == 0)
                     {
                         strprolist.Append(order.P_ID + "," + order.Price + "," + order.Quality + "," + (order.Price * order.Quality)+","+order.ChiCun+","+order.BianHao);
                         flag = 1;
                     }
                     else
                     {
                         strprolist.Append("|" + order.P_ID + "," + order.Price + "," + order.Quality + "," + (order.Price * order.Quality) + "," + order.ChiCun+","+order.BianHao);
                     }
                }
                return strprolist.ToString();
            }
        }
        //public Hashtable Orders
        //{
        //    get { return Cart_Orders; }
        //}
        //计算总数量
        public int TotalQuality
        {
            get
            {
                Int32 total = 0;
                foreach (DictionaryEntry entry in Cart_Orders)
                {
                    CarData order = (CarData)entry.Value;
                    total +=order.Quality;
                }
                return total;
            }
        }
      
        //计算总价格
        public decimal TotalCost
        {
            get
            {
                decimal total = 0;
                foreach (DictionaryEntry entry in Cart_Orders)
                {
                    CarData order = (CarData)entry.Value;
                    total += (order.Price * order.Quality);
                }
                return total;
            }
        }
        //添加物件方法
        public void AddItem(CarData Order)
        {
            CarData order = (CarData)Cart_Orders[Order.P_ID.ToString ()];
            if (order != null)
                order.Quality += Order.Quality;
            else
                Cart_Orders.Add(Order.P_ID.ToString (), Order);
        }
        //删除物件
        public void DeleteItem(long ItemID)
        {
            if (Cart_Orders[ItemID.ToString()] != null)
                Cart_Orders.Remove(ItemID.ToString());              
        }
        //更新购物车数量
        public void UpdateQuality(long ItemID,int quality)
        {
            CarData order = (CarData)Cart_Orders[ItemID.ToString()];
            if (quality > 0)
            {
                order.Quality = quality;
                Cart_Orders[ItemID.ToString()] = order;
            }
        }
        //更新价格
        public void UpdatePrice(long ItemID, decimal price)
        {
            CarData order = (CarData)Cart_Orders[ItemID.ToString()];
            order.Price = price;
            Cart_Orders[ItemID.ToString()] = order;           
        }
        //更新购物车所有商品的价格
        public ShoppingCart UpdateAllPrice(int usertype, ShoppingCart car)
        {
           
            EWang.BLL.Product_Data bll = new Product_Data();
            long pid=0L;
            decimal hyprice=0.0M;
            foreach (DictionaryEntry entry in car.Cart_Orders)
            {
                CarData order = (CarData)entry.Value;
                string strkey = entry.Key.ToString();
                pid = order.P_ID;
                switch (usertype)
                {
                    case 1:
                        hyprice = bll.GetHYPrice(pid);
                        break;
                    case 2:
                        hyprice = bll.GetHYPrice1(pid);
                        break;
                    case 3:
                        hyprice = bll.GetHYPrice2(pid);
                        break;
                }
                order.Price = hyprice;
                car.Cart_Orders[strkey] = order;
            }
            return car;
        }
        /// <summary>
        ///清空购物车
        /// </summary>
        public void ClearAll()
        {
            Cart_Orders.Clear();
        }
    }
}

前台页面View_ShoppingCart.aspx

<script language="javascript"   type="text/javascript">
    function   trim(str){return   str.replace(/^\s+|\s+$/,'')}
    function checkisempty(obj)
 {  
  if(trim(obj.value)=="")
  {
   obj.value="1";
  }  
 }
</script>

<table width="807" border="0" align="center" cellpadding="0" cellspacing="0">
        <tr>
          <td width="10"><img src="images/d01_01.jpg" width="10" height="29" /></td>
          <td width="97" background="images/d01_bj.jpg"><table width="95%" border="0" align="center" cellpadding="0" cellspacing="0">
            <tr>
              <td align="center" valign="middle" class="shoujia">您订购的商品</td>
            </tr>
            <tr>
              <td align="center" valign="middle"><img src="images/sanjiao04.jpg" width="7" height="4" /></td>
            </tr>
          </table></td>
          <td width="4"><img src="images/d01_02.jpg" width="4" height="29" /></td>
          <td width="696" background="images/d01_03.jpg"><table width="95%" border="0" align="center" cellpadding="0" cellspacing="0">
            <tr>
              <td align="center" class="top5">商品名称</td>
              <td width="80" align="center" class="top5">编号</td>
              <td width="80" align="center" class="top5">尺寸</td>
              <td width="80" align="center" class="top5">单价</td>
              <td width="80" align="center" class="top5">数量</td>
              <td width="80" align="center" class="top5">小计</td>
              <td width="80" align="center" class="top5">删除</td>
            </tr>
          </table></td>
        </tr>
      </table>    
          <form id="form1" runat="server" style="0px auto; padding:0px;">
          <table width="807" border="0" align="center" cellpadding="0" cellspacing="0">
          <asp:Repeater ID="RepeaterCar" runat="server" EnableViewState="True" >
           <ItemTemplate>
          
        <tr>
          <td width="110" height="120" align="center" valign="middle">
          <img src="<%#getPic(DataBinder.Eval( Container.DataItem,"P_ID" ))%>" width="90" height="100" />
          </td>
          <td width="252" align="center" valign="middle" class="sousuo"><%#getProductName(DataBinder.Eval(Container.DataItem, "P_ID"))%></td>
          <td width="91" align="center" valign="middle" class="sousuo"><%#DataBinder.Eval( Container.DataItem,"BianHao" )%></td>
        
          <td width="91" align="center" valign="middle" class="sousuo"><%#DataBinder.Eval( Container.DataItem,"ChiCun" )%></td>
          <td width="85" align="center" valign="middle" class="sousuo"><%#DataBinder.Eval(Container.DataItem, "Price","{0:c}")%></td>
          <td width="86" align="center" valign="middle"><asp:TextBox  EnableViewState="true"  CssClass="inputnormal" ID="TextBox1" runat="server" Text='<%#DataBinder.Eval( Container.DataItem,"Quality" )%>' onblur="checkisempty(this);"></asp:TextBox></td>
          <td width="87" align="center" valign="middle" class="sousuo"><%#CalTotal(DataBinder.Eval(Container.DataItem, "Price"), DataBinder.Eval(Container.DataItem, "Quality"))%></td>
          <td width="96" align="center" valign="middle" class="sousuo"> <asp:Label ID="LabPID" runat="server" Text='<%#DataBinder.Eval( Container.DataItem,"P_ID" )%>' Visible="false"></asp:Label>
        <a href="View_ShoppingCart.aspx?act=del&pid=<%#DataBinder.Eval( Container.DataItem,"P_ID" )%>" class="top1">删除</a></td>
        </tr>        
    
          </ItemTemplate>   
          <SeparatorTemplate>
           <tr>
          <td height="1" colspan="8" bgcolor="#CCCCCC"></td>
        </tr>
          </SeparatorTemplate>
      </asp:Repeater>
       </table>
      <table width="807" border="0" align="center" cellpadding="0" cellspacing="0">
        <tr>
          <td width="440" height="50" align="left" valign="middle"><a href="Default.aspx"><img src="images/d02.jpg" width="114" height="31" border="0" /></a></td>
          <td align="center" valign="middle" class="top9">总计：<asp:Literal ID="LitZJ" runat="server" EnableViewState="false"></asp:Literal></td>
          <td align="right" valign="middle">
              <asp:ImageButton ID="btnClear" runat="server" OnClick="btnClear_Click" style="cursor:hand;" ImageUrl="images/d03.jpg" Height="22px" ImageAlign="AbsMiddle" Width="103px" />
              </td>
          <td align="right" valign="middle">
              <asp:ImageButton ID="BtnSave" OnClick="BtnSave_Click" runat="server" Height="22px" ImageAlign="AbsMiddle"
                  ImageUrl="images/d04.jpg" Width="103px" style="cursor:hand;"/></td>
        </tr>
        <tr>
          <td height="40" colspan="4" align="center" valign="middle"><a href="MakeOrder.aspx"><img src="images/d05.jpg" width="125" height="30" border="0" /></a></td>
        </tr>
      </table>
      </form>

代码文件:View_ShoppingCart.aspx.cs文件

 protected void Page_Load(object sender, EventArgs e)
    {

        //if (EWang.BLL.Users.isLogin() == false)
        //{

        //    string message = "window.alert('你还没有登录,请选择后再进行本次操作!');window.location.href='Login.aspx';";
        //    MessageBox.ResponseScript(this, message);
        //    return;
        //}
        //else
        //{

            if (Request.QueryString["act"] == "del")
            {
                delPro();
            }
            else if (Request.QueryString["act"] == "add")
            {
                this.AddItemToCart();
            }
            else
            {
                if (!this.IsPostBack)
                {
                    this.BindShoppingCart();
                }
            }
            this.strtitle = "我的购物车" + "-" + WebBasicInfo.sitename;
            this.strkeywords = WebBasicInfo.keyword;
            this.webSiteDesc = WebBasicInfo.webintro;
            // Freeze(string.Format(@"{0}.htm", Request.Url.ToString()));
        //}
       
    }
    private void AddItemToCart()
    {
        string url="";
        if (Request.UrlReferrer != null)
        {
            url = Request.UrlReferrer.ToString();
        }
       
        string pid = Request["proid"].ToString();      
        string quality = Request["quality"].ToString();
        string price=Request["price"].ToString ();
        string ishavesize = Request["ishavesize"].ToString();
        string bianhao = Request["hidbianhao"].ToString();
        if (bianhao.Trim() == "")
        {
            bianhao = "无";
        }
        string chicun = "无";
        if (ishavesize == "1")
        {
            chicun = Request["selSize"].ToString().Trim ();           
            if (chicun == "")
            {
                MessageBox.ResponseScript("alert('保存成功！');location.href='"+url+"';");            
            }
        }
        EWang.BLL.Product_Data bll = new EWang.BLL.Product_Data();
        int num = bll.GetPNum(long.Parse(pid));
        int qua = int.Parse(quality);

        if ((num <= 0 || num - qua <= 0)&&url!="")
        {
            if (url.IndexOf("&h=u") > 0)
            {

            }
            else
            {
                url = url + "&h=u";
            }
            Response.Redirect(url);
        }
        EWang.BLL.CarData order = new EWang.BLL.CarData(long.Parse(pid), Int32.Parse(quality), decimal.Parse(price), chicun, bianhao);
        EWang.BLL.ShoppingCart cart = (EWang.BLL.ShoppingCart)Session["MyShoppingCart"]; //创建实例

        if (cart != null)
        {
            cart.AddItem(order);
            Session["MyShoppingCart"] = cart;
            Response .Redirect("View_ShoppingCart.aspx");
        }

    }
    private void delPro()
    {
        if (string.IsNullOrEmpty(Request.QueryString["pid"]))
        {
            Server.Transfer("View_ShoppingCart.aspx");
        }
        else
        {
            string strpid = Request.QueryString["pid"].ToString().Trim();
            EWang.BLL.ShoppingCart cart = (EWang.BLL.ShoppingCart)(Session["MyShoppingCart"]);
            cart.DeleteItem(long.Parse(strpid));
            Session["MyShoppingCart"] = cart;
            Response.Redirect("View_ShoppingCart.aspx");
        }
    }
    private void BindShoppingCart()
    {
        EWang.BLL.ShoppingCart cart = (EWang.BLL.ShoppingCart)(Session["MyShoppingCart"]);
        if (cart != null)
        {
            this.RepeaterCar.DataSource = cart.Orders;
            this.RepeaterCar.DataBind();
           // this.LitXJ.Text = string.Format("{0:c}", cart.TotalCost);
            this.LitZJ.Text = string.Format("{0:c}", cart.TotalCost);
        }
    }
    public string getPic(object obj)
    {
        EWang.BLL.Product_Data bll = new EWang.BLL.Product_Data();
        return EWang.Common.FormatData.getImgSrc(bll.GetPic(long.Parse(obj.ToString ())));
    }
    public string getProductName(object obj)
    {
        EWang.BLL.Product_Data bll = new EWang.BLL.Product_Data();
        return bll.GetProductName(long.Parse(obj.ToString ()));
    }
    public string CalTotal(object price, object quality)
    {
        decimal total=decimal.Parse(price.ToString ()) * Int32.Parse(quality.ToString ());
        return string.Format("{0:c}",total);
    }
    protected void BtnSave_Click(object sender, EventArgs e)
    {
      
            Label lblPID = new Label();
            TextBox txtQua=new TextBox ();
            EWang.BLL.ShoppingCart cart = (EWang.BLL.ShoppingCart)(Session["MyShoppingCart"]);
            foreach (RepeaterItem li in this.RepeaterCar.Items)
            {
                lblPID = (Label)(li.FindControl("LabPID"));
                txtQua = (TextBox)(li.FindControl("TextBox1"));
                cart.UpdateQuality(long .Parse(lblPID.Text.Trim ()),int.Parse(txtQua.Text.Trim ()));
            }
            Session["MyShoppingCart"] = cart;
            Response.Redirect("View_ShoppingCart.aspx");
       
    }
    protected void btnClear_Click(object sender, EventArgs e)
    {
        EWang.BLL.ShoppingCart cart = (EWang.BLL.ShoppingCart)(Session["MyShoppingCart"]);
        cart.ClearAll();
        Session["MyShoppingCart"] = cart;
        Response.Redirect("View_ShoppingCart.aspx");
    }