using System;using System.Collections;using System.ComponentModel;using System.Data;using System.Data.SqlClient;using System.Drawing;using System.Drawing.Imaging;using System.Web;using System.Web.SessionState;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.HtmlControls;using System.IO;namespace TipsTricks.Ch4
{
/// <summary>
/// Summary description for ShowSmallImage.
/// </summary> public class ShowSmallImage : System.Web.UI.Page { const int MaxLength=150; //最大长度 private void Page_Load(object sender, System.EventArgs e) { if (Request.QueryString["filename"] != null) { //取得原图 string filename=Request.QueryString["filename"]; Bitmap bmpOld= new Bitmap(Server.MapPath("images/" + filename)); //计算缩小比例 double d1; if (bmpOld.Height>bmpOld.Width) d1=(double)(MaxLength/(double)bmpOld.Width); else d1=(double)(MaxLength/(double)bmpOld.Height); //产生缩图 Bitmap bmpThumb= new Bitmap(bmpOld,(int)(bmpOld.Width*d1),(int)(bmpOld.Height*d1)); // 清除缓冲 Response.Clear(); //生成图片 bmpThumb.Save(Response.OutputStream, ImageFormat.Jpeg); Response.End(); //释放资源 bmpThumb.Dispose(); bmpOld.Dispose(); } } #region Web Form Designer generated code override protected void OnInit(EventArgs e) { // // CODEGEN: This call is required by the ASP.NET Web Form Designer. // InitializeComponent(); base.OnInit(e); } /// <summary> /// Required method for Designer support - do not modify /// the contents of this method with the code editor. /// </summary> private void InitializeComponent() { this.Load += new System.EventHandler(this.Page_Load); } #endregion }
}GetThumbnail.aspx
<%@ Page language="c#" Codebehind="ListImage.aspx.cs" AutoEventWireup="false" Inherits="TipsTricks.Ch4.ListImage" %><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" ><HTML> <HEAD> <title>ListImage</title> <meta name="GENERATOR" Content="Microsoft Visual Studio 7.0"> <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="FlowLayout"> <form id="ListImage" method="post" runat="server"> <P><FONT face="黑体"> <asp:DataList id="DataList1" runat="server" Width="28px" RepeatColumns="2" RepeatDirection="Vertical" BorderWidth="1px" GridLines="Vertical" CellPadding="3" BackColor="White" BorderStyle="None" BorderColor="#999999"> <SelectedItemStyle Font-Bold="True" ForeColor="White" BackColor="#008A8C"></SelectedItemStyle> <HeaderTemplate> <FONT face="宋体"></FONT> </HeaderTemplate> <SelectedItemTemplate> <FONT face="宋体"></FONT> </SelectedItemTemplate> <AlternatingItemStyle BackColor="Gainsboro"></AlternatingItemStyle> <ItemStyle ForeColor="Black" BackColor="#EEEEEE"></ItemStyle> <ItemTemplate> <asp:HyperLink id=HyperLink1 Runat="server" NavigateUrl='<%# DataBinder.Eval(Container, "DataItem.filename", "images/{0}") %>' Target="_blank"> <asp:Image id=Image2 runat="server" ImageUrl='<%# "GetThumbnail.aspx?filename=" + Server.UrlEncode(DataBinder.Eval(Container, "DataItem.filename").ToString()) %>' AlternateText='<%# "文件名称:" + DataBinder.Eval(Container, "DataItem.filename") + "\n文件尺寸:" + DataBinder.Eval(Container, "DataItem.size") + " bytes" %>'> </asp:Image> </asp:HyperLink> <asp:Button id="Button1" onclick="HHH" runat="server" Text="Button"></asp:Button> </ItemTemplate> </asp:DataList></P> </form> </FONT> </body></HTML>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.IO;namespace TipsTricks.Ch4{ /// <summary> /// Summary description for ListImage. /// </summary> public class ListImage : System.Web.UI.Page { protected System.Web.UI.WebControls.DataList DataList1; private void Page_Load(object sender, System.EventArgs e) { if (!IsPostBack) { //获取文件名称 string[] files=Directory.GetFiles(Server.MapPath("images")); //建立数据表 DataTable dt=new DataTable(); dt.Columns.Add("filename"); dt.Columns.Add("size"); foreach (string s in files) { DataRow dr=dt.NewRow(); FileInfo f=new FileInfo(s); dr["filename"]=f.Name; dr["size"]=f.Length; dt.Rows.Add(dr); } //绑定显示 this.DataList1.DataSource=dt; this.DataList1.DataBind(); } } public void HHH(object sender, System.EventArgs e) { this.Response.Write("hello"); } #region Web Form Designer generated code override protected void OnInit(EventArgs e) { // // CODEGEN: This call is required by the ASP.NET Web Form Designer. // InitializeComponent(); base.OnInit(e); } /// <summary> /// Required method for Designer support - do not modify /// the contents of this method with the code editor. /// </summary> private void InitializeComponent() { this.Load += new System.EventHandler(this.Page_Load); } #endregion }}