asp.net 实现购物车详细代码_asp.net技巧

＜%@ 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” );
}
}
}

http://www.cnblogs.com/boundless/archive/2007/01/16/621553.html