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這篇文章主要介紹“如何顯示ASP.NET中圖片”,在日常操作中,相信很多人在如何顯示ASP.NET中圖片問題上存在疑惑,小編查閱了各式資料,整理出簡單好用的操作方法,希望對大家解答”如何顯示ASP.NET中圖片”的疑惑有所幫助!接下來,請跟著小編一起來學(xué)習(xí)吧!
具體如下:
genimage.ashx:
復(fù)制代碼 代碼如下:
<%@ 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 //圖片瀏覽次數(shù) int numviews; //圖片數(shù)據(jù)庫中的ID int picid = Convert.ToInt32(Context.Request["id"]); //圖片路徑 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 //顯示縮略圖 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(); //更新數(shù)據(jù)庫瀏覽次數(shù) npdata.SetNumViews(picid, numviews+1); } } } }
使用方法:
復(fù)制代碼 代碼如下:
imgCtrl.ImageUrl = "genimage.ashx?id=" + Request["id"];
到此,關(guān)于“如何顯示ASP.NET中圖片”的學(xué)習(xí)就結(jié)束了,希望能夠解決大家的疑惑。理論與實(shí)踐的搭配能更好的幫助大家學(xué)習(xí),快去試試吧!若想繼續(xù)學(xué)習(xí)更多相關(guān)知識(shí),請繼續(xù)關(guān)注億速云網(wǎng)站,小編會(huì)繼續(xù)努力為大家?guī)砀鄬?shí)用的文章!
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