asp.net 购物车实现详细代码

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