1、httphandler

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實例1：通過生成一張動態圖片輸出客戶端的IP地址、操作系統類型、瀏覽器類型

<%@ WebHandler Language="C#" Class="visitor" %>using System; using System.Web;public class visitor : IHttpHandler {public void ProcessRequest(HttpContext context){context.Response.ContentType = "image/JPEG";using (System.Drawing.Bitmap bitImage = new System.Drawing.Bitmap(330, 300)){//設置畫布using (System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitImage)){//IPg.DrawString("IP:" + context.Request.UserHostAddress, new System.Drawing.Font("宋體", 20), System.Drawing.Brushes.Red, new System.Drawing.PointF(0, 0));//操作系統g.DrawString("操作系統:" + context.Request.Browser.Platform, new System.Drawing.Font("宋體", 20), System.Drawing.Brushes.Red, new System.Drawing.PointF(0, 50));//瀏覽器g.DrawString("瀏覽器:" + context.Request.Browser.Type, new System.Drawing.Font("宋體", 20), System.Drawing.Brushes.Red, new System.Drawing.PointF(0, 100));}//保存到輸出流中 bitImage.Save(context.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);}}public bool IsReusable {get {return false;}}}

實例2：通過“下載”連接，彈出用戶附件保存

html代碼：<a href="dowload.ashx">下載</a>

<%@ WebHandler Language="C#" Class="dowload" %>using System; using System.Web;public class dowload : IHttpHandler {public void ProcessRequest(HttpContext context){string fileName = HttpUtility.UrlEncode("悲劇.jpg");context.Response.ContentType = "image/JPEG";//打開附件對話框 報文頭header和設置它的值context.Response.AddHeader("Content-Disposition", "attachment:filename=" + fileName);context.Response.WriteFile("蘋果.jpg"); }public bool IsReusable {get {return false;}}}

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總結

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