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Asp.net implements file download function

巴扎黑Original: 2017-08-15 13:45:442178browse

This article mainly introduces Asp.net's use of general processing programs to implement file download functions. It is very good and has reference value. Friends in need can refer to it

First there is an html page, and the page has an Link, click the link to pop up file download/save (similar to Thunder download link)

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
 <title>文件下载</title>
 <meta charset="utf-8" />
</head>
<body>
 <!--该方式不行，1：如果访问的是类似文本等浏览器可以处理的文件，则是浏览器打开显示的方式，并不是文件下载；2：如果访问的是App_Data文件夹里的文件，由于.net的机制不允许访问App_Data文件夹资源，所以会报“请求筛选模块被配置为拒绝包含 hiddenSegment 节的 URL 中的路径。”-->
 <a href="App_Data/readme.txt" rel="external nofollow" >下载readme.txt文件</a>
 <br />
 <a href="DownloadFileHandler.ashx" rel="external nofollow" >下载readme.txt文件</a>
</body>
</html>

The code of the general processing program is as follows

using System.IO;
using System.Web;
namespace Zhong.Web
{
 /// <summary>
 /// DownloadFileHandler 的摘要说明
 /// </summary>
 public class DownloadFileHandler : IHttpHandler
 {
  public void ProcessRequest(HttpContext context)
  {
   string filePath = context.Server.MapPath("~/App_Data/readme.txt");
   FileStream fs = new FileStream(filePath, FileMode.Open);
   byte[] bytes = new byte[fs.Length];
   fs.Read(bytes, 0, bytes.Length);
   fs.Dispose();
   context.Response.ContentType = "application/octet-stream";
   context.Response.AddHeader("Content-Disposition", "attachment; filename=readme.txt");
   context.Response.BinaryWrite(bytes);
   context.Response.Flush();
   //大文件下载的解决方案
   //context.Response.ContentType = "application/x-zip-compressed";
   //context.Response.AddHeader("Content-Disposition", "attachment;filename=z.zip");
   //string filename = Server.MapPath("~/App_Data/move.zip");
   //context.Response.TransmitFile(filename);
  }
  public bool IsReusable
  {
   get
   {
    return false;
   }
  }
 }
}

Click the first link to access, the display is as follows:

Click the second link to access, download the file:

Since I have already tested it once before, I named it readme(1).txt

when downloading this time.

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