Shulou(Shulou.com)06/03 Report--

This article mainly introduces "how to display pictures in ASP.NET". In daily operation, I believe many people have doubts about how to display pictures in ASP.NET. The editor consulted all kinds of materials and sorted out simple and easy-to-use methods of operation. I hope it will be helpful to answer the questions of "how to display pictures in ASP.NET". Next, please follow the editor to study!

The details are as follows:

Genimage.ashx:

The copy code is as follows:

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.htmlusing 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 / / number of image views int numviews; / / ID int picid = Convert.ToInt32 in the picture database (Context.Request ["id"]); / / Image path 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 / / display thumbnail 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 (); / / Update database browsing times npdata.SetNumViews (picid, numviews+1);}

How to use it:

The copy code is as follows:

ImgCtrl.ImageUrl = "genimage.ashx?id=" + Request ["id"]

At this point, the study on "how to display pictures in ASP.NET" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.