ASP.NET下载文件

前段时间需要实现ASP.NET下载文件,如何实现ASP.NET下载文件? 在原文找到了答案,果断转载过来收藏,只试过第一种方式~

 1 /*

 2 微软为Response对象提供了一个新的方法TransmitFile来解决使用Response.BinaryWrite

 3 下载超过400mb的文件时导致Aspnet_wp.exe进程回收而无法成功下载的问题。

 4 代码如下：

 5 */

 6 

 7 Response.ContentType = "application/x-zip-compressed";

 8 Response.AddHeader("Content-Disposition", "attachment;filename=z.zip");

 9 string filename = Server.MapPath("DownLoad/aaa.zip");

10 Response.TransmitFile(filename);

方式一

 1 //using System.IO;

 2 string fileName = "aaa.zip";//客户端保存的文件名

 3 string filePath = Server.MapPath("DownLoad/aaa.zip");//路径

 4 

 5 FileInfo fileInfo = new FileInfo(filePath);

 6 Response.Clear();

 7 Response.ClearContent();

 8 Response.ClearHeaders();

 9 Response.AddHeader("Content-Disposition", "attachment;filename=" + fileName);

10 Response.AddHeader("Content-Length", fileInfo.Length.ToString());

11 Response.AddHeader("Content-Transfer-Encoding", "binary");

12 Response.ContentType = "application/octet-stream";

13 Response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312");

14 Response.WriteFile(fileInfo.FullName);

15 Response.Flush();

16 Response.End();

方式二

 1 string fileName = "aaa.zip";//客户端保存的文件名

 2 string filePath = Server.MapPath("DownLoad/aaa.zip");//路径

 3 

 4 System.IO.FileInfo fileInfo = new System.IO.FileInfo(filePath);

 5 

 6 if (fileInfo.Exists == true)

 7 {

 8     const long ChunkSize = 102400;//100K 每次读取文件，只读取100Ｋ，这样可以缓解服务器的压力

 9     byte[] buffer = new byte[ChunkSize];

10 

11     Response.Clear();

12     System.IO.FileStream iStream = System.IO.File.OpenRead(filePath);

13     long dataLengthToRead = iStream.Length;//获取下载的文件总大小

14     Response.ContentType = "application/octet-stream";

15     Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(fileName));

16     while (dataLengthToRead > 0 && Response.IsClientConnected)

17     {

18         int lengthRead = iStream.Read(buffer, 0, Convert.ToInt32(ChunkSize));//读取的大小

19         Response.OutputStream.Write(buffer, 0, lengthRead);

20         Response.Flush();

21         dataLengthToRead = dataLengthToRead - lengthRead;

22     }

23     Response.Close();

24 }

方式三

 1 string fileName = "aaa.zip";//客户端保存的文件名

 2 string filePath = Server.MapPath("DownLoad/aaa.zip");//路径

 3 

 4 //以字符流的形式下载文件

 5 FileStream fs = new FileStream(filePath, FileMode.Open);

 6 byte[] bytes = new byte[(int)fs.Length];

 7 fs.Read(bytes, 0, bytes.Length);

 8 fs.Close();

 9 Response.ContentType = "application/octet-stream";

10 //通知浏览器下载文件而不是打开

11 Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8));

12 Response.BinaryWrite(bytes);

13 Response.Flush();

14 Response.End();

方式四