ASP.NET中图片显示方法实例

 // Copyright (C) 2003 by Greg Ennis // (mailto:[email protected]) // // 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); } } } }