booksearch.aspx.cs

网上书店系统由两部分组成:购书网站和订单处理中心。其中购书网站是一个Web应用程序, 用户可以通过Web浏览器登录到此网站.在此网站

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;

namespace Bookshop
{
	/// <summary>
	/// BookSearch 的摘要说明。
	/// </summary>
	public class BookSearch : System.Web.UI.Page
	{
		protected System.Web.UI.WebControls.DropDownList DropDownList1;
		protected System.Web.UI.WebControls.TextBox TextBox1;
		protected System.Web.UI.WebControls.RequiredFieldValidator RequiredFieldValidator1;
		protected System.Web.UI.WebControls.DataGrid DataGrid1;
		protected System.Web.UI.WebControls.ImageButton ImageButton1;
	
		private void Page_Load(object sender, System.EventArgs e)
		{
			// 在此处放置用户代码以初始化页面
		}

		#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.ImageButton1.Click += new System.Web.UI.ImageClickEventHandler(this.ImageButton1_Click);
			this.DataGrid1.PageIndexChanged += new System.Web.UI.WebControls.DataGridPageChangedEventHandler(this.DataGrid1_PageIndexChanged);
			this.DataGrid1.ItemDataBound += new System.Web.UI.WebControls.DataGridItemEventHandler(this.DataGrid1_ItemDataBound);
			this.Load += new System.EventHandler(this.Page_Load);

		}
		#endregion

		private void ImageButton1_Click(object sender, System.Web.UI.ImageClickEventArgs e)
		{
			this.dataBind();
		}

		private void dataBind()
		{
			string content = this.TextBox1.Text.Trim().Replace( "\'", "\"" );
			int temp = this.DropDownList1.SelectedIndex;
			DataSet tempSet = null;
			switch( temp )
			{
				case 0:
					tempSet = OleDbConn.ExecuteDataSet( "select title_id, title as BookName, pub_name as Publisher, dateonsale as SaleDate, price as Price from Titles,Publishers where Titles.pub_id = Publishers.pub_id and title like '%"+content+"%' order by title_id desc" );
					break;
				case 1:
					tempSet = OleDbConn.ExecuteDataSet( "select title_id, title as BookName, pub_name as Publisher,dateonsale as SaleDate, price as Price from Titles,Publishers where Titles.pub_id = Publishers.pub_id and pub_name like '%"+content+"%' order by title_id desc" );
					break;
				case 2:
					tempSet = OleDbConn.ExecuteDataSet( "select title_id, title as BookName, pub_name as Publisher, dateonsale as SaleDate, price as Price from Titles,Publishers where Titles.pub_id = Publishers.pub_id and price<"+content+" order by title_id desc" );
					break;
				case 3:
					tempSet = OleDbConn.ExecuteDataSet( "select title_id, title as BookName, pub_name as Publisher,dateonsale as SaleDate, price as Price from Titles,Publishers where Titles.pub_id = Publishers.pub_id and price >"+content+" order by title_id desc" );
					break;
			}
			
			this.DataGrid1.DataSource = tempSet;
			this.DataGrid1.DataBind();
			tempSet.Clear();
			OleDbConn.CloseConn();
		}

		private void DataGrid1_PageIndexChanged(object source, System.Web.UI.WebControls.DataGridPageChangedEventArgs e)
		{
			this.DataGrid1.CurrentPageIndex = e.NewPageIndex;
			this.dataBind();
		}

		private void DataGrid1_ItemDataBound(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
		{
			e.Item.Cells[0].Visible = false;
			
			if( e.Item.ItemType != ListItemType.Header && e.Item.ItemType != ListItemType.Footer )
			{
				e.Item.Cells[4].Text = "$" + e.Item.Cells[4].Text;
				e.Item.Cells[1].Text = "<a href=\"BookShow.aspx?bookid=" + e.Item.Cells[0].Text + "\">" + e.Item.Cells[1].Text + "</a>";
			}
		}
	}
}