📄 实现购物车.txt

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1.Web.config中存放着数据库的连接字符串
2.Global.asax.cs中添加了会话事件开始处理程序Session_Start
3.Congo.aspx 为商店页,有向购物车添加条目、查看购物车的功能。
4.ViewCart.aspx 为购物车，有删除条目、返回商店的功能、
5.Support.cs 实了两个序列化的类BookOrder(定单)、ShoppingCart(购物车)。

6.使用状态服务器模式，将重启IIS,会话状态仍然保留。

具体如下:
1.Web.config关键部分
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <appSettings>
    <add key="connectString"
      value="server=localhost;database=pubs;uid=sa;pwd=" />
  </appSettings>
<system.web>
     <sessionState 
            mode="InProc"
            stateConnectionString="tcpip=127.0.0.1:42424"
            sqlConnectionString="data source=127.0.0.1;Trusted_Connection=yes"
            cookieless="false" 
            timeout="20" 
    />
 </system.web>
</configuration>
2.Global.asax.cs 关键部分
		protected void Session_Start(Object sender, EventArgs e)
		{
				Session["MyShoppingCart"] = new ShoppingCart();
		}

3.Congo.aspx
<%@ Page language="c#" Codebehind="Congo.aspx.cs" AutoEventWireup="false" Inherits="MyCongo.WebForm1" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
	<HEAD>
		<title>WebForm1</title>
		<meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1">
		<meta name="CODE_LANGUAGE" Content="C#">
		<meta name="vs_defaultClientScript" content="JavaScript">
		<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
	</HEAD>
	<body MS_POSITIONING="GridLayout">
		<form id="Form1" method="post" runat="server">
			<asp:Button id="BtnView" style="Z-INDEX: 101; LEFT: 56px; POSITION: absolute; TOP: 32px" runat="server"
				Text="查看购物车"></asp:Button>
			<asp:DataGrid id="DataGrid1" style="Z-INDEX: 102; LEFT: 56px; POSITION: absolute; TOP: 80px" runat="server"
				AutoGenerateColumns="False">
				<Columns>
					<asp:BoundColumn HeaderText="标识" DataField="title_id" />
					<asp:BoundColumn HeaderText="标题" DataField="title" />
					<asp:BoundColumn HeaderText="价格" DataField="price" DataFormatString="{0:c}" HeaderStyle-HorizontalAlign="center"
						ItemStyle-HorizontalAlign="right" />
					<asp:ButtonColumn HeaderText="动作" Text="加入购物车" HeaderStyle-HorizontalAlign="center" ItemStyle-HorizontalAlign="center"
						CommandName="AddToCart" />
				</Columns>
			</asp:DataGrid>
		</form>
	</body>
</HTML>
4.Congo.aspx.cs
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.Data.SqlClient;
using System.Configuration;
namespace MyCongo
{
	/// <summary>
	/// WebForm1 的摘要说明。
	/// </summary>
	public class WebForm1 : System.Web.UI.Page
	{
		protected System.Web.UI.WebControls.Button BtnView;
		protected System.Web.UI.WebControls.DataGrid DataGrid1;
	
		private void Page_Load(object sender, System.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);
				DataGrid1.DataSource = ds;
				DataGrid1.DataBind ();
			}
		}

		#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.BtnView.Click += new System.EventHandler(this.BtnView_Click);
			this.DataGrid1.ItemCommand += new System.Web.UI.WebControls.DataGridCommandEventHandler(this.DataGrid1_ItemCommand);
			this.Load += new System.EventHandler(this.Page_Load);

		}
		#endregion

		private void DataGrid1_ItemCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
		{
			if (e.CommandName == "AddToCart") 
			{
				BookOrder order = new BookOrder (e.Item.Cells[0].Text,
					e.Item.Cells[1].Text, Convert.ToDecimal
					(e.Item.Cells[2].Text.Substring (1)), 1);
				ShoppingCart cart = (ShoppingCart) Session["MyShoppingCart"];
				if (cart != null)
					cart.AddOrder (order);
			}
		}

		private void BtnView_Click(object sender, System.EventArgs e)
		{
			Response.Redirect ("ViewCart.aspx");
		}
	}
}
5.ViewCart.aspx
<%@ Page language="c#" Codebehind="ViewCart.aspx.cs" AutoEventWireup="false" Inherits="MyCongo.ViewCart" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
	<HEAD>
		<title>ViewCart</title>
		<meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1">
		<meta name="CODE_LANGUAGE" Content="C#">
		<meta name="vs_defaultClientScript" content="JavaScript">
		<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
	</HEAD>
	<body MS_POSITIONING="GridLayout">
		<form id="Form1" method="post" runat="server">
			<asp:Button id="BtnShop" style="Z-INDEX: 101; LEFT: 32px; POSITION: absolute; TOP: 16px" runat="server"
				Text="返回商店"></asp:Button>
			<asp:DataGrid id="DataGrid1" style="Z-INDEX: 102; LEFT: 88px; POSITION: absolute; TOP: 80px" runat="server"
				AutoGenerateColumns="False">
				<Columns>
					<asp:BoundColumn HeaderText="标识" DataField="ItemID" />
					<asp:BoundColumn HeaderText="标题" DataField="Title" />
					<asp:BoundColumn HeaderText="价格" DataField="Price" DataFormatString="{0:c}" HeaderStyle-HorizontalAlign="center"
						ItemStyle-HorizontalAlign="right" />
					<asp:BoundColumn HeaderText="数量" DataField="Quantity" HeaderStyle-HorizontalAlign="center" ItemStyle-HorizontalAlign="center" />
					<asp:ButtonColumn HeaderText="动作" Text="删除" HeaderStyle-HorizontalAlign="center" ItemStyle-HorizontalAlign="center"
						CommandName="RemoveFromCart" />
				</Columns>
			</asp:DataGrid>
			<asp:Label id="Total" style="Z-INDEX: 103; LEFT: 88px; POSITION: absolute; TOP: 392px" runat="server"></asp:Label>
		</form>
	</body>
</HTML>
6.ViewCart.aspx.cs
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.Data.SqlClient;
namespace MyCongo
{
	/// <summary>
	/// ViewCart 的摘要说明。
	/// </summary>
	public class ViewCart : System.Web.UI.Page
	{
		protected System.Web.UI.WebControls.Button BtnShop;
		protected System.Web.UI.WebControls.Label Total;
		protected System.Web.UI.WebControls.DataGrid DataGrid1;
	
		private void Page_Load(object sender, System.EventArgs e)
		{
			ShoppingCart cart = (ShoppingCart)Session["MyShoppingCart"];
			if (cart != null) 
			{
				DataGrid1.DataSource = cart.Orders;
				DataGrid1.DataBind ();
				Total.Text = String.Format ("Total Cost: {0:c}",
					cart.TotalCost);
			}
		}

		#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.BtnShop.Click += new System.EventHandler(this.BtnShop_Click);
			this.DataGrid1.ItemCommand += new System.Web.UI.WebControls.DataGridCommandEventHandler(this.DataGrid1_ItemCommand);
			this.Load += new System.EventHandler(this.Page_Load);

		}
		#endregion

		private void DataGrid1_ItemCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
		{
			if (e.CommandName == "RemoveFromCart") 
			{
				ShoppingCart cart = (ShoppingCart) Session["MyShoppingCart"];
				if (cart != null) 
				{
					cart.RemoveOrder (e.Item.Cells[0].Text);
					DataGrid1.DataBind ();
					Total.Text = String.Format ("Total Cost: {0:c}",
						cart.TotalCost);
				}
			}
		}

		private void BtnShop_Click(object sender, System.EventArgs e)
		{
			 Response.Redirect("Congo.aspx");
		}
	}
}
7.Support.cs 
using System;
using System.Collections;

namespace MyCongo
{
	[Serializable]
	public class BookOrder//定单
	{
		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; }
		}
        //构造函数
		public BookOrder (string ItemID, string Title, decimal Price,
			int Quantity)
		{
			_ItemID = ItemID;
			_Title = Title;
			_Price = Price;
			_Quantity = Quantity;
		}
	}

	[Serializable]
	public class ShoppingCart
	{
		Hashtable _Orders = new Hashtable ();//哈希表

		//实现一个接口的属性，以便可以被绑定
		public ICollection Orders 
		{
			get { return _Orders.Values; }
		}
	    //统计总价值
		public decimal TotalCost
		{
			get 
			{
				decimal total = 0;
				foreach (DictionaryEntry entry in _Orders) 
				{
					BookOrder order = (BookOrder) entry.Value;
					total += (order.Price * order.Quantity);
				}
				return total;
			}
		}
        //向购物车加入物品
		public void AddOrder (BookOrder Order)
		{
			BookOrder order = (BookOrder) _Orders[Order.ItemID];
			if (order != null)
				order.Quantity += Order.Quantity;
			else
				_Orders.Add (Order.ItemID, Order);
		}
        //向购物车删除物品
		public void RemoveOrder (string ItemID)
		{
			if (_Orders[ItemID] != null)
				_Orders.Remove (ItemID);
		}
	}
}
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