ASP.NET中图片显示方法实例
2015-07-22 00:00
666 查看
本文实例讲述了ASP.NET中图片的显示方法。分享给大家供大家参考。具体如下:
genimage.ashx:
<%@ WebHandler Language="C#" Class="netpix.ImageGenerator" %>
genimage.ashx.cs:
// Copyright (C) 2003 by Greg Ennis // (mailto:greg@ennis.net) // // The contents of this file are subject to the Artistic License (the "License"). // You may not use this file except in compliance with the License. // You may obtain a copy of the License at: // http://www.opensource.org/licenses/artistic-license.html using System; using System.Collections; using System.ComponentModel; using System.Data; using System.Data.SqlClient; using System.Drawing; using System.Web; using System.IO; using System.Configuration; using System.Web.SessionState; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.HtmlControls; namespace netpix { public class ImageGenerator : IHttpHandler { public bool IsReusable { get { return true; } } public void ProcessRequest(HttpContext Context) { // Get the image filename and album root path from the database //图片浏览次数 int numviews; //图片数据库中的ID int picid = Convert.ToInt32(Context.Request["id"]); //图片路径 string imgpath = npdata.GetPathToPicture(picid, out numviews); // Writing an image to output stream Context.Response.ContentType = "image/jpg"; // 'thumbnail' means we are requesting a thumbnail //显示缩略图 if (Context.Request["thumbnail"] != null) { // Need to load the image, resize it, and stream to the client. // Calculate the scale so as not to stretch or distort the image. Bitmap bmp = new Bitmap(imgpath); float scale = 150.0f / System.Math.Max(bmp.Height, bmp.Width); System.Drawing.Image thumb = bmp.GetThumbnailImage((int)(bmp.Width * scale), (int)(bmp.Height * scale), null, System.IntPtr.Zero); thumb.Save(Context.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg); bmp.Dispose(); thumb.Dispose(); } else { // Stream directly from the file // Get the stream and send it out the response System.IO.FileStream fs = File.Open(imgpath, FileMode.Open, FileAccess.Read, FileShare.Read); const int byteLength = 8192; byte[] bytes = new byte[byteLength]; while( fs.Read(bytes, 0, byteLength ) != 0 ) { Context.Response.BinaryWrite(bytes); } fs.Close(); //更新数据库浏览次数 npdata.SetNumViews(picid, numviews+1); } } } }
使用方法:
imgCtrl.ImageUrl = "genimage.ashx?id=" + Request["id"];
希望本文所述对大家的ASP.NET程序设计有所帮助。
相关文章推荐
- ASP.NET仿新浪微博下拉加载更多数据瀑布流效果
- IWAM账号密码不一致引起IIS无法处理ASP文件
- 用ASP实现超长内容的word模板替换objDoc.Content.Find.Execute
- IIS7.0下ASP+Access(MDB)应用环境设置要点
- IIS无法在后台生成WORD文件的故障
- IIS6主机上开启webservice的权限设置问题
- 关于使用UTF-8开发ASP网站
- 用ADSI+ASP添加IP到IIS禁止访问列表中
- 【西祠日志】【05】修修补补asp留言板,学习git,asp的ajax实现(2015.07.21周二)
- asp.net 如何配置authentication,完成基于表单的身份验证
- The introduction to Web.config of ASP.NET #Reprinted#
- Spring aspectJ切面使用步骤
- JasperReports+iReport在eclipse中的使用
- asp.net登录界面记住密码
- asp.net 页面跳转传值的几种方式
- ASP.NET网页抓取数据
- ASP.NET 4.0 安裝在 IIS6 最常遇到的四個問題
- ASP.NET通过自定义函数实现对字符串的大小写切换功能
- ASP解析UNCODI \0F24324 \0UAF
- ASP解析JOSN