1 <%@ WebHandler Language="C#" Class="DownLoad" %> 2  3 using System; 4 using System.Web; 5  6 public class DownLoad : IHttpHandler { 7      8     public void ProcessRequest (HttpContext context) { 9         //针对图片不能下载，强制另存为10         //1. 获取要下载的文件路径11         string strFilePath = context.Request.QueryString["n"];12         //2. 转成物理路径13         strFilePath = context.Request.MapPath(strFilePath);14         //3. 关键：添加一个响应报文头，强制浏览器以另存为附件的方式打开本次输出的响应报文15         context.Response.AddHeader("Content-Disposition","attachment;filename=downloadfile.jpg");16         //4. 将文件读取并输出给浏览器17         context.Response.WriteFile(strFilePath);18     }19  20     public bool IsReusable {21         get {22             return false;23         }24     }25 26 }