强制另存为

 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 }