我們用“Inherits="CornfieldGrocer.MainForm"”來表示我們的頁面繼承自MainForm類，這樣我們就實現了對ASP.NET Web 表單行為的控制碼與頁面顯示的HTML的分離。其中“AutoEventWireup="false"”表示頁面事件非自動使能——頁面事件非自動使能的意思是所有頁面事件必須經過使用者明確的操作才能觸發，由於該屬性預設為“true”表示自動使能，但我們的商業邏輯要求非自動使能，故這裡的語句很有必要，否則會引起系統處理的混亂。下面我們來看MainForm類：
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System;
using System.Data;
using System.Data.SqlClient;
using System.Collections;
namespace CornfieldGrocer
{
public class InventoryDB
{
public DataTable GetProducts(int categoryID)
{
SqlConnection sqlConnect= new SqlConnection
("server=(local);database=CornfieldGrocer;Trusted_Connection=yes");
SqlDataAdapter sqlAdapter1 = new SqlDataAdapter
("Select * from Products where categoryid="+categoryID,sqlConnect);
DataSet products = new DataSet();
sqlAdapter1.Fill(products, "products");
return products.Tables[0];
}
public DataRow GetProduct(int productID)
{
SqlConnection sqlConnect= new SqlConnection
("server=(local);database=CornfieldGrocer;Trusted_Connection=yes");
SqlDataAdapter sqlAdapter1 = new SqlDataAdapter
("Select * from Products where productID=" + productID, sqlConnect);
DataSet product = new DataSet();
sqlAdapter1.Fill(product, "product");
return product.Tables[0].Rows[0];
}
public DataTable GetProductCalories(int productID)
{
SqlConnection sqlConnect = new SqlConnection
("server=(local);database=CornfieldGrocer;Trusted_Connection=yes");
SqlDataAdapter sqlAdapter1 = new SqlDataAdapter
("Select * from Details where productID="+productID,sqlConnect);
DataSet details = new DataSet();
sqlAdapter1.Fill(details, "details");
return details.Tables[0];
}
}
public class OrderItem
{
public int productID;
public int quantity;
public String name;
public double price;
public OrderItem(int productID, String name, double price, int quantity)
{
this.productID = productID;
this.quantity = quantity;
this.name = name;
this.price = price;
}
public int ProductID
{
get { return ProductID; }
}
public int Quantity
{
get { return quantity; }
set { quantity=value; }
}
public String Name
{
get { return name; }
}
public double Price
{
get { return price; }
}
public double Total
{
get { return quantity * price; }
}
}
public class OrderList
{
private Hashtable orders = new Hashtable();
private double taxRate = 0.08;
public double SubTotal
{
get
{
if (orders.Count == 0)
return 0.0;
double subTotal = 0;
IEnumerator items = orders.Values.GetEnumerator();
while(items.MoveNext())
{
subTotal += ((OrderItem) items.Current).Price *
((OrderItem) items.Current).Quantity;
}
return subTotal;
}
}
public double TaxRate
{
get { return taxRate; }
set { taxRate = value; }
}
public double Tax
{
get { return SubTotal * taxRate; }
}
public double Total
{
get { return SubTotal * (1 + taxRate); }
}
public ICollection Values {
get {
return orders.Values;
}
}
public OrderItem this[String name] {
get {
return (OrderItem) orders[name];
}
}
public void Add(OrderItem value)
{
if (orders[value.Name] == null) {
orders.Add(value.Name, value);
}
else
{
OrderItem oI = (OrderItem)orders[value.Name];
oI.Quantity = oI.Quantity + 1;
}
}
public void ClearCart() {
orders.Clear();
}
}
}
