以前，在页面上实现缩略图必须借助第三方组件。现在，有了.NET，就可以很轻松地实现缩略图。下面就是实现缩略图的例子。 ToThumbnailImage.aspx
<%@ Page language="c#" Codebehind="ToThumbnailImage.aspx.cs" Src="ToThumbnailImage.aspx.cs" AutoEventWireup="false"
Inherits="Exam_C.ToThumbnailImage" %>
<html>
<head>
<title>Lion互动网络 =>生成缩略图</title>
</head>
<body>
<form id="Form1" method="post" runat="server">
</form>
</body>
</html>
ToThumbnailImage.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.Drawing.Imaging;
namespace Exam_C
{
/// <summary>
/// ToThumbnailImage 的摘要说明。
/// </summary>
public class ToThumbnailImage : System.Web.UI.Page
{
/*
Create By lion
2003-05-20 19:00
Copyright (C) 2004 www.LionSky.Net. All rights reserved.
Web: http://www.Lionsky.net ;
Email: lion-a@sohu.com
*/
static Hashtable htmimes=new Hashtable();
internal readonly string AllowExt = ".jpe|.jpeg|.jpg|.png|.tif|.tiff|.bmp";
#region Web 窗体设计器生成的代码
override protected void OnInit(EventArgs e)
{
#region htmimes[".jpe"]="image/jpeg";
htmimes[".jpeg"]="image/jpeg";
htmimes[".jpg"]="image/jpeg";
htmimes[".png"]="image/png";
htmimes[".tif"]="image/tiff";
htmimes[".tiff"]="image/tiff";
htmimes[".bmp"]="image/bmp";
#endregion
//调用生成缩略图方法
ToThumbnailImages("lionsky.jpg","b.gif",300);
}
#endregion
#region Helper
/// <summary>
/// 获取图像编码解码器的所有相关信息
/// </summary>
/// <param name="mimeType">包含编码解码器的多用途网际邮件扩充协议 (MIME) 类型的字符串</param>
/// <returns>返回图像编码解码器的所有相关信息</returns>
static ImageCodecInfo GetCodecInfo(string mimeType)
{
ImageCodecInfo[] CodecInfo = ImageCodecInfo.GetImageEncoders();
foreach(ImageCodecInfo ici in CodecInfo)
{
if(ici.MimeType == mimeType)return ici;
}
return null;
}
