asp.net实现购物车 （转）
<%@ Page language="c#" Codebehind="shoppingcart.aspx.cs" AutoEventWireup="false" Inherits="myshop.shoppingcart" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<title>shoppingcart</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<LINK href="mycss.css" type="text/css" rel="stylesheet">
<meta name="vs_defaultClientScript" content="JavaScript">
<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
</HEAD>
<body>
<center>
<form id="Form1" runat="server">
<table width="500" border="0" cellspacing="0" cellpadding="0">
<tr>
<td>
<ASP:DataGrid id="ShoppingCartDlt" runat="server" Width="500" BackColor="white" BorderColor="black"
ShowFooter="false" CellPadding="3" CellSpacing="0" Font-Name="Verdana" Font-Size="8pt" HeaderStyle-BackColor="#cecfd6"
AutoGenerateColumns="false" MaintainState="true">
<Columns>
<asp:TemplateColumn HeaderText="删除">
<ItemTemplate>
<center>
<asp:CheckBox id="chkProductID" runat="server" />
</center>
</ItemTemplate>
</asp:TemplateColumn>
<asp:BoundColumn DataField="ProdID" HeaderText="ID" />
<asp:BoundColumn DataField="ProName" HeaderText="商品名称" />
<asp:BoundColumn DataField="UnitPrice" HeaderText="单价" />
<asp:TemplateColumn HeaderText="数量">
<ItemTemplate>
<asp:TextBox id="CountTb" runat="server" Text='<%#DataBinder.Eval(Container.DataItem,"ProdCount")%>'>
</asp:TextBox>
</ItemTemplate>
</asp:TemplateColumn>
<asp:BoundColumn DataField="TotalPrice" HeaderText="小计(元)" />
</Columns>
</ASP:DataGrid></td>
</tr>
</table>
<br>
<table width="500" border="0" cellspacing="0" cellpadding="0">
<tr>
<td><asp:Button id="update" runat="server" Text="更新我的购物车" CssClass="button2" /></td>
<td><asp:Button id="CheckOut" runat="server" Text="结算" CssClass="button5" /> <input type="button" name="close2" value="继续购物" onClick="window.close();return false;"
class="button2"></td>
<td align="right"><br>
<asp:Label id="label" runat="server" Width="100px" Visible="True" ForeColor="#FF8080" Height="18px"></asp:Label></td>
</tr>
</table>
</form>
</center>
</body>
</HTML>
=======================================================================================
以上为HTML页面部分
==========================================================================================
using System;
using System.Collections;
using System.ComponentModel;
using System.Web.SessionState;
using System.Web;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.OleDb;
using System.Configuration;
namespace myshop
{
/// <summary>
/// shoppingcart 的摘要说明。
/// </summary>
public class shoppingcart : System.Web.UI.Page
{
protected System.Web.UI.WebControls.DataGrid ShoppingCartDlt;
protected System.Web.UI.WebControls.Button update;
protected System.Web.UI.WebControls.Button CheckOut;
protected System.Web.UI.HtmlControls.HtmlForm Form1;
protected System.Web.UI.WebControls.Label label;
protected System.Web.UI.WebControls.CheckBox chkProductID;
protected System.Web.UI.WebControls.TextBox txtCount;
protected System.Web.UI.WebControls.TextBox CountTb;
string AddProID;
private void Page_Load(object sender, System.EventArgs e)
{
try
{
if (Session["logon"]!="yes"||Session["username"]==null)
{
Response.Redirect("error.htm") ;
}
}
catch
{
Response.Redirect("error.htm") ;
} /////////////查看用户是否已经登陆。
if(!IsPostBack)
{
if(Request.Params["mode"]=="view") //检测是否为直接查看购物车。
{
ViewShoppingCart();
Caculator();
}
if(Request.Params["productID"]!=null||Request.Params["productID"]!="")
{
AddProID=Request["productID"];
UpdateShoppingCart();
Caculator();
}
}// 在此处放置用户代码以初始化页面
}
public void CreateCartTable() //创建购物车
{
DataSet ds = new DataSet();
DataTable newDT=new DataTable("CartTable");
ds.Tables.Add(newDT);
DataColumn newDC;
newDC=new DataColumn("ProdID",System.Type.GetType("System.Int32"));
ds.Tables["CartTable"].Columns.Add(newDC);
newDC=new DataColumn("ProdCount",System.Type.GetType("System.Int32"));
newDC.DefaultValue=1;
ds.Tables["CartTable"].Columns.Add(newDC);
newDC=new DataColumn("ProName",System.Type.GetType("System.String"));
ds.Tables["CartTable"].Columns.Add(newDC);
newDC=new DataColumn("UnitPrice",System.Type.GetType("System.Double"));
ds.Tables["CartTable"].Columns.Add(newDC);
newDC=new DataColumn("TotalPrice",System.Type.GetType("System.Double"));
ds.Tables["CartTable"].Columns.Add(newDC);
newDC=new DataColumn("IsDeleted",System.Type.GetType("System.Int32"));
newDC.DefaultValue=0; // public void WriteShoppingCart() 中 newDR[5]="0"; 行，已被注销，
ds.Tables["CartTable"].Columns.Add(newDC);
Session["myCartTable"]=newDT;
ShoppingCartDlt.DataSource=ds.Tables["CartTable"].DefaultView;
ShoppingCartDlt.DataBind();
}
public void UpdateShoppingCart()
{
if(Session["myCartTable"]==null)//Session["myCartTable"]==null
{
CreateCartTable(); //调用函数CreateCartTable()新建一个DataTable
WriteShoppingCart();
}
else
{ //如果购物蓝中已有商品，则需要对购物信息表DataTable进行更新，并将其棒定到ShoppingCartDlt
WriteShoppingCart();
}
}
public void ViewShoppingCart() //查看购物车
{
if(Session["myCartTable"]!=null)
{
DataTable viewTable=new DataTable("nowCartTable");
viewTable=(DataTable)Session["myCartTable"];
ShoppingCartDlt.DataSource = viewTable.DefaultView; //购物车棒定到ShoppingCartDlt
ShoppingCartDlt.DataBind();
}
}
public void WriteShoppingCart()
{
if(Request.Params["mode"]!="view") //检查是否是直接查看购物车，如果直接查看，就不再写MYCARTTABLE
{
DataTable nowTable=new DataTable("nowCartTable");
nowTable=(DataTable)Session["myCartTable"];
int pn=nowTable.Rows.Count;
int i=0;
bool hasone=false;
int nowProdID;
while(i<pn && !hasone)
{
nowProdID=Int32.Parse(nowTable.Rows[i][0].ToString());
if(nowProdID==Int32.Parse(AddProID)) //判断购物信息表中，是否存有当前放入商品。 if(nowProdID==Int32.Parse(AddProID))
{
hasone=true;
}
else
{
i++;
}
}
if(hasone)
{ //如果已有该商品，则 hasone=true，更改该数据行
DataRow oldDR;
oldDR=nowTable.Rows[i];
oldDR["ProdCount"]=Int32.Parse(oldDR["ProdCount"].ToString())+1;
oldDR["TotalPrice"]=Int32.Parse(oldDR["ProdCount"].ToString())*Double.Parse(oldDR["UnitPrice"].ToString());
}
else
{ //如果没有该商品，在表中新加如一行。
DataRow newDR;
double unitp;
String strcon="provider=Microsoft.jet.OLEDB.4.0;data Source="+Server.MapPath(ConfigurationSettings.AppSettings["MDBpath2"])+";";
OleDbConnection myConnection = new OleDbConnection(strcon);
string strSQL= "select * from pro where product_id="+AddProID+"";
OleDbDataAdapter myCommand = new OleDbDataAdapter(strSQL, myConnection);
DataSet ds = new DataSet();
myCommand.Fill(ds, "AddP");
newDR=nowTable.NewRow();
newDR[0]=AddProID;
newDR[2]=ds.Tables["Addp"].Rows[0]["product_name"].ToString();
unitp=Double.Parse(ds.Tables["AddP"].Rows[0]["product_memprice"].ToString()); //会员价
newDR[3]=unitp;
newDR[4]=unitp; //第一次读库，所以总价格和单价是一样的。
//newDR[5]="0";
nowTable.Rows.Add(newDR);
myConnection.Close();
}
ShoppingCartDlt.DataSource = nowTable.DefaultView; //将更新后的 DataTable棒定到ShoppingCartDlt
ShoppingCartDlt.DataBind();
Session["myCartTable"] = nowTable;
//重新保存更新过的DataTable
}
}
public void Caculator()
{
if(Session["myCartTable"]!=null) //购物车是否为空
{
int h;
Double TotalPri;
TotalPri=0;
DataTable nowTable3=new DataTable("nowCartTable3");
nowTable3=(DataTable)Session["myCartTable"];
if(nowTable3.Rows.Count>0) //返回购物车中是否有货物
{
for(h=0;h<=nowTable3.Rows.Count-1;h++)
{
TotalPri=TotalPri+Int32.Parse(nowTable3.Rows[h][4].ToString());//Double.Parse((string)TotalText.Text);
}
label.Text="总计: "+TotalPri.ToString()+" 元" ;
}
}
}
public void Update()
{
int i;
int j;
int k;
ArrayList deleteItem = new ArrayList(10);
DataGridItem _item ;
j=0;
int deleteid;
k=0;
DataTable nowTable2=new DataTable("nowCartTable2");
nowTable2=(DataTable)Session["myCartTable"];
for(i=0;i<=this.ShoppingCartDlt.Items.Count-1;i++)
{
_item = this.ShoppingCartDlt.Items[i];
TextBox CountText=(TextBox)this.ShoppingCartDlt.Items[i].Cells[4].FindControl("CountTb");//Controls[1];//_item.FindControl("CountTb");
CheckBox ProductIDCheck =(CheckBox) _item.FindControl("chkProductID");
nowTable2.Rows[i][1] = Int32.Parse(CountText.Text.ToString());
nowTable2.Rows[i][4] = Int32.Parse(nowTable2.Rows[i][1].ToString()) * Double.Parse(nowTable2.Rows[i][3].ToString());
if(ProductIDCheck.Checked)
{
nowTable2.Rows[i][5] = 1;//添加删除标记1
j=j+1;
}
}
string strExpr="IsDeleted>0"; //http://msdn.microsoft.com/library/chs/default.asp?url=/library/CHS/cpref/html/frlrfSystemDataDataTableClassSelectTopic.asp
DataRow[] foundRows = nowTable2.Select(strExpr);
for(int m = 0; m < foundRows.Length; m ++)
{
//Console.WriteLine(foundRows[i][0]);
foundRows[m].Delete();
}
ShoppingCartDlt.DataSource = nowTable2.DefaultView;
ShoppingCartDlt.DataBind();
Session["myCartTable"] = nowTable2;
Caculator();
}
#region web 窗体设计器生成的代码
override protected void OnInit(EventArgs e)
{
//
// CODEGEN: 该调用是 asp.NET web 窗体设计器所必需的。
//
InitializeComponent();
base.OnInit(e);
}
/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.update.Click += new System.EventHandler(this.update_Click);
this.CheckOut.Click += new System.EventHandler(this.CheckOut_Click);
this.Load += new System.EventHandler(this.Page_Load);
}
#endregion
private void update_Click(object sender, System.EventArgs e)
{
Update();
}
private void CheckOut_Click(object sender, System.EventArgs e)
{
Update();
Response.Redirect("checkout.aspx");
}
}
}
