congo.aspx和congo.cs和ViewCart.aspx

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：

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>
congo.cs(独立代码，在App_Code)中

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:

viewCart.cs
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原文地址：https://www.cnblogs.com/simhare/p/822899.html