congo.aspx和congo.cs和ViewCart.aspx
ShoppingCart 是Congo.cs中定义的一种自定义数据类型。它还伴随着BookOrder，也是在Congo.cs中定义。
ShoppingCart主要是对HashTable的包装。
它实现了一个名为_Orders的私有字段，该字段持有一个HashTable引用，ShoppingCart 还实现了一些公有方法，这些方法使BookOrder对象能够被添加到HashTable中并被删除，
ShoppingCart还实现了一个名为Orders的公共属性，该属性在HashTable的ICollection接口中可用：
aspx：
1<%@ Page Language="C#" AutoEventWireup="true" CodeFile="congo.aspx.cs" Inherits="congo" %> 2 3<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 4 5<html xmlns="http://www.w3.org/1999/xhtml" > 6<head runat="server"> 7 <title>congo.comPage</title> 8</head> 9<body>10 <h1>congo.com</h1>11 <form id="form1" runat="server">12 <div>13 <table id="tbl1" width="100%" bgcolor="teal">14 <tr>15 <td>16 <asp:Button ID="btn1" Text="View Cart" OnClick="OnViewCart"17 runat="server" /> 18 </td>19 </tr>20 </table>21 </div>22 <center>23 <asp:DataGrid ID="MyDataGrid"24 AutoGenerateColumns="false" CellPadding="2"25 BorderWidth="1" BorderColor="lightgray"26 Font-Names="Verdana" Font-Size="8pt"27 GridLines="vertical" Width="90%"28 OnItemCommand="OnItemCommand" runat="server">29 <Columns>30 <asp:BoundColumn HeaderText="Item ID" DataField="title_id">31 </asp:BoundColumn>32 <asp:BoundColumn HeaderText="Title" DataField="title">33 </asp:BoundColumn>34 <asp:BoundColumn HeaderText="Price" DataField="price" DataFormatString="{0:C}"35 HeaderStyle-HorizontalAlign="center" ItemStyle-HorizontalAlign="right">36 </asp:BoundColumn>37 <asp:ButtonColumn HeaderText="Action" ButtonType="pushButton" Text="Add To Cart"38 HeaderStyle-HorizontalAlign="center" 39 ItemStyle-HorizontalAlign="center" CommandName="AddToCart">40 </asp:ButtonColumn>41 </Columns>42 43 <HeaderStyle BackColor="teal" ForeColor="white" Font-Bold="true" />44 <ItemStyle BackColor="white" ForeColor="darkblue" />45 <AlternatingItemStyle BackColor="beige" ForeColor="darkblue" />46 </asp:DataGrid>47 </center>48 </form>49</body>50</html>51
congo.aspx.cs:
using
System;
using
System.Data;
using
System.Data.SqlClient;
using
System.Configuration;
using
System.Collections;
using
System.Web;
using
System.Web.Security;
using
System.Web.UI;
using
System.Web.UI.WebControls;
using
System.Web.UI.WebControls.WebParts;
using
System.Web.UI.HtmlControls;
public
partial
class
congo : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{ if (!IsPostBack) { string ConnectString = ConfigurationSettings.AppSettings["connectString"]; SqlDataAdapter adapter = new SqlDataAdapter("select * from titles where price!=0", ConnectString); DataSet ds = new DataSet(); adapter.Fill(ds); MyDataGrid.DataSource = ds; MyDataGrid.DataBind();
} } //用户调用该页面并单击“AddToCart”按钮时调用该方法 /**//// <summary> /// 该方法从DataGrid中检索产品ID及相应书籍的价格，并将 /// 它们封装到一个BookOrder对象中 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> protected void OnItemCommand(Object sender, DataGridCommandEventArgs e) { if (e.CommandName == "AddToCart") { //有两种方法可以得到这里的BookOrder、ShoppingCart //1.把congo.cs放在App_Code文件夹内。 //2.把congo.cs编译成dll文件放在Bin文件夹内 //倾向于前者，便于查看Congo.cs的内容 BookOrder order = new BookOrder(e.Item.Cells[0].Text,e.Item.Cells[1].Text,Convert.ToDecimal(e.Item.Cells[2].Text.Substring(1)),1); //global.asax中有Session_Start,这里的SessionID？？？？ ShoppingCart cart = (ShoppingCart)Session["MyShoppingCart"]; if (cart != null) { cart.AddOrder(order); } Response.Write("<script>alert('success to add "+e.Item.Cells[1].Text+"')</script>"); } } protected void OnViewCart(Object sender, EventArgs e) { Response.Redirect("ViewCart.aspx"); }
}
global.asax:
<%
@ Application Language
=
"
C#
"
%>
<
script runat
=
"
server
"
>
void
Application_Start(
object
sender, EventArgs e)
{ // Code that runs on application startup }
void
Application_End(
object
sender, EventArgs e)
{ // Code that runs on application shutdown }
void
Application_Error(
object
sender, EventArgs e)
{ // Code that runs when an unhandled error occurs }
void
Session_Start(
object
sender, EventArgs e)
{ //为请求页面的用户创建一个会话 Session["MyShoppingCart"] = new ShoppingCart(); // Code that runs when a new session is started }
void
Session_End(
object
sender, EventArgs e)
{ // Code that runs when a session ends. // Note: The Session_End event is raised only when the sessionstate mode // is set to InProc in the Web.config file. If session mode is set to StateServer // or SQLServer, the event is not raised. }
</
script
>
using System;using System.Collections;using System.Data;using System.Configuration;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;using System.Web.UI.HtmlControls;/**//// <summary>/// Summary description for congo/// </summary>public class congo{ public congo() { // // TODO: Add constructor logic here // }}[Serializable]public class BookOrder{ string _ItemID; string _Title; decimal _Price; int _Quantity; public string ItemID { get { return _ItemID; } set { _ItemID = value; } } public string Title { get { return _Title; } set { _Title = value; } } public decimal Price { get { return _Price; } set { _Price = value; } } public int Quantity { get { return _Quantity; } set { _Quantity = value; } } /**//// <summary> /// 定义一个BookOrder对象，用于封装BookOrder（要买的哪些书） /// </summary> /// <param name="ItemID">订购的条目的ID对应数据表中的Title_ID</param> /// <param name="Title">书的标题</param> /// <param name="Price">价格</param> /// <param name="Quantity">数量</param> public BookOrder(string ItemID, string Title, decimal Price, int Quantity) { _ItemID = ItemID; _Title = Title; _Price = Price; _Quantity = Quantity; }}//public class BookOrder End[Serializable]public class ShoppingCart{ /**//// <summary> /// public class Hashtable : IDictionary, ICollection /// 位于System.Collections空间下 /// </summary> Hashtable _Orders = new Hashtable(); /**//// <summary> /// 定义一个只读属性，返回值类型为ICollection /// ShoppingCart的Orders属性公开了底层HashTable的ICollection接口 /// 下面这条语句只是把HashTable的ICollection接口交给DataGrid /// MyDataGrid.DataSource=cart.Orders; /// ShoppingCart 和BookOrder都有Serializable特性标记。所以不论选择哪种 /// 会话状态进程模式，它们都能够被保存到会话状态中。 /// ＊＊＊把打算保存到会话状态中的类型标记为可序列化的， /// ＊＊＊以便当进程模式改变时不需要修改源代码 /// </summary> public ICollection Orders { get { return _Orders.Values; } } /**//// <summary> /// 计算总的费用 /// </summary> public decimal TotalCost { get { decimal total = 0; //DictionaryEntry是一个struct，位于System.Collections命名空间下 foreach(DictionaryEntry entry in _Orders) { BookOrder order = (BookOrder)entry.Value; total += (order.Price * order.Quantity); } return total; } } /**//// <summary> /// ShoppingCart中，添加订单 /// </summary> /// <param name="Order">Order是封装了订单的BookOrder类型对象</param> public void AddOrder(BookOrder Order) { //把一个HashTable转换成BookOrder //Order.ItemID-->the Key Whose Value to Get or Set BookOrder order = (BookOrder)_Orders[Order.ItemID]; //order 是一个特定的（ItemID）对应的order，它是一个BookOrder对象 if (order != null) { //如果已有该BookOrder订单项，只需要加上数量就可以了 order.Quantity += Order.Quantity; } else { //_Orders是个HashTable，HashTable有个Add方法 // Adds an element with the specified key and value into the System.Collections.Hashtable. _Orders.Add(Order.ItemID, Order); } } /**//// <summary> /// 根据ItemID移除已经添加到购物车的条目 /// </summary> /// <param name="ItemID">已经在购物车内的条目</param> public void RemoveOrder(string ItemID) { if (_Orders[ItemID] != null) { //_Orders是个HashTable，HashTable有个Remove方法 _Orders.Remove(ItemID); } }}//public class ShoppingCart END
ViewCart.aspx和aspx.cs:
1
<%
@ Page Language
=
"
C#
"
AutoEventWireup
=
"
true
"
CodeFile
=
"
ViewCart.aspx.cs
"
Inherits
=
"
ViewCart
"
%>
2
3
4
<
html xmlns
=
"
http://www.w3.org/1999/xhtml
"
>
5
<
head runat
=
"
server
"
>
6
<
title
>
Untitled Page
</
title
>
7
</
head
>
8
<
body
>
9
<
form id
=
"
form1
"
runat
=
"
server
"
>
10
<
div
>
11
<
table width
=
"
100%
"
bgcolor
=
"
teal
"
>
12
<
tr
>
13
<
td
>
14
<
asp:Button ID
=
"
lblReturnShop
"
Text
=
"
Return to Shopping
"
OnClick
=
"
OnShop
"
runat
=
"
server
"
/>
15
16
</
td
>
17
</
tr
>
18
</
table
>
19
</
div
>
20
21
<
br
/>
22
<
center
>
23
<
asp:DataGrid ID
=
"
MyDataGrid
"
AutoGenerateColumns
=
"
false
"
CellPadding
=
"
2
"
24 BorderWidth
=
"
1
"
BorderColor
=
"
lightgray
"
Font
-
Names
=
"
Verdana
"
25 Font
-
Size
=
"
8pt
"
GridLines
=
"
vertical
"
Width
=
"
90%
"
OnItemCommand
=
"
OnItemCommand
"
runat
=
"
server
"
>
26
<
Columns
>
27
<
asp:BoundColumn HeaderText
=
"
Item ID
"
DataField
=
"
ItemID
"
>
28
</
asp:BoundColumn
>
29
30
<
asp:BoundColumn HeaderText
=
"
Title
"
DataField
=
"
Title
"
>
31
</
asp:BoundColumn
>
32
<
asp:BoundColumn HeaderText
=
"
Price
"
DataField
=
"
Price
"
DataFormatString
=
"
{0:C}
"
33 HeaderStyle
-
HorizontalAlign
=
"
center
"
ItemStyle
-
HorizontalAlign
=
"
right
"
>
34
</
asp:BoundColumn
>
35
36
<
asp:BoundColumn HeaderText
=
"
Quantity
"
DataField
=
"
Quantity
"
37 HeaderStyle
-
HorizontalAlign
=
"
center
"
ItemStyle
-
HorizontalAlign
=
"
center
"
>
38
</
asp:BoundColumn
>
39
<
asp:ButtonColumn HeaderText
=
"
Action
"
Text
=
"
Remove
"
40 HeaderStyle
-
HorizontalAlign
=
"
center
"
ItemStyle
-
HorizontalAlign
=
"
center
"
CommandName
=
"
RemoveFromCart
"
>
41
</
asp:ButtonColumn
>
42
</
Columns
>
43
44
<
HeaderStyle BackColor
=
"
teal
"
ForeColor
=
"
white
"
Font
-
Bold
=
"
true
"
/>
45
<
ItemStyle BackColor
=
"
white
"
ForeColor
=
"
darkblue
"
/>
46
<
AlternatingItemStyle BackColor
=
"
beige
"
ForeColor
=
"
darkBlue
"
/>
47
</
asp:DataGrid
>
48
</
center
>
49
<
h3
><
asp:Label ID
=
"
Total
"
runat
=
"
server
"
></
asp:Label
></
h3
>
50
</
form
>
51
</
body
>
52
</
html
>
53
ViewCart.aspx.cs:
<%
@ Page Language
=
"
C#
"
AutoEventWireup
=
"
true
"
CodeFile
=
"
ViewCart.aspx.cs
"
Inherits
=
"
ViewCart
"
%>
2
3
4
<
html xmlns
=
"
http://www.w3.org/1999/xhtml
"
>
5
<
head runat
=
"
server
"
>
6
<
title
>
Untitled Page
</
title
>
7
</
head
>
8
<
body
>
9
<
form id
=
"
form1
"
runat
=
"
server
"
>
10
<
div
>
11
<
table width
=
"
100%
"
bgcolor
=
"
teal
"
>
12
<
tr
>
13
<
td
>
14
<
asp:Button ID
=
"
lblReturnShop
"
Text
=
"
Return to Shopping
"
OnClick
=
"
OnShop
"
runat
=
"
server
"
/>
15
16
</
td
>
17
</
tr
>
18
</
table
>
19
</
div
>
20
21
<
br
/>
22
<
center
>
23
<
asp:DataGrid ID
=
"
MyDataGrid
"
AutoGenerateColumns
=
"
false
"
CellPadding
=
"
2
"
24
BorderWidth
=
"
1
"
BorderColor
=
"
lightgray
"
Font
-
Names
=
"
Verdana
"
25
Font
-
Size
=
"
8pt
"
GridLines
=
"
vertical
"
Width
=
"
90%
"
OnItemCommand
=
"
OnItemCommand
"
runat
=
"
server
"
>
26
<
Columns
>
27
<
asp:BoundColumn HeaderText
=
"
Item ID
"
DataField
=
"
ItemID
"
>
28
</
asp:BoundColumn
>
29
30
<
asp:BoundColumn HeaderText
=
"
Title
"
DataField
=
"
Title
"
>
31
</
asp:BoundColumn
>
32
<
asp:BoundColumn HeaderText
=
"
Price
"
DataField
=
"
Price
"
DataFormatString
=
"
{0:C}
"
33
HeaderStyle
-
HorizontalAlign
=
"
center
"
ItemStyle
-
HorizontalAlign
=
"
right
"
>
34
</
asp:BoundColumn
>
35
36
<
asp:BoundColumn HeaderText
=
"
Quantity
"
DataField
=
"
Quantity
"
37
HeaderStyle
-
HorizontalAlign
=
"
center
"
ItemStyle
-
HorizontalAlign
=
"
center
"
>
38
</
asp:BoundColumn
>
39
<
asp:ButtonColumn HeaderText
=
"
Action
"
Text
=
"
Remove
"
40
HeaderStyle
-
HorizontalAlign
=
"
center
"
ItemStyle
-
HorizontalAlign
=
"
center
"
CommandName
=
"
RemoveFromCart
"
>
41
</
asp:ButtonColumn
>
42
</
Columns
>
43
44
<
HeaderStyle BackColor
=
"
teal
"
ForeColor
=
"
white
"
Font
-
Bold
=
"
true
"
/>
45
<
ItemStyle BackColor
=
"
white
"
ForeColor
=
"
darkblue
"
/>
46
<
AlternatingItemStyle BackColor
=
"
beige
"
ForeColor
=
"
darkBlue
"
/>
47
</
asp:DataGrid
>
48
</
center
>
49
<
h3
><
asp:Label ID
=
"
Total
"
runat
=
"
server
"
></
asp:Label
></
h3
>
50
</
form
>
51
</
body
>
52
</
html
>
53
viewCart.cs
using System;using System.Data;using System.Configuration;using System.Collections;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;using System.Web.UI.HtmlControls;public partial class ViewCart : System.Web.UI.Page{ protected void Page_Load(object sender, EventArgs e) { ShoppingCart cart = (ShoppingCart)Session["MyShoppingCart"]; if (cart != null) { MyDataGrid.DataSource = cart.Orders; MyDataGrid.DataBind(); Total.Text = String.Format("Total Cost:{0:c}", cart.TotalCost); } } protected void OnItemCommand(Object sender, DataGridCommandEventArgs e) { if (e.CommandName == "RemoveFromCart") { ShoppingCart cart = (ShoppingCart)Session["MyShoppingCart"]; if (cart != null) { cart.RemoveOrder(e.Item.Cells[0].Text); MyDataGrid.DataBind(); Total.Text = String.Format("Total Cost:{0:c}", cart.TotalCost); } } } public void OnShop(object sender, EventArgs e) { Response.Redirect("Congo.aspx"); }}