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  • asp.net+批量下载附件

    asp.net 下载文件几种方式

    protected void Button1_Click(object sender, EventArgs e)

      {

      /*

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

      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。

      代码如下:

      */

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

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

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

      Response.TransmitFile(filename);

      }

      //WriteFile实现下载

      protected void Button2_Click(object sender, EventArgs e)

      {

      /*

      using System.IO;


      */

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

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

      FileInfo fileInfo = new FileInfo(filePath);

      Response.Clear();

      Response.ClearContent();

      Response.ClearHeaders();

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

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

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

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

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

      Response.WriteFile(fileInfo.FullName);

      Response.Flush();

      Response.End();

      }

      //WriteFile分块下载

      protected void Button3_Click(object sender, EventArgs e)

      {

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

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

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

      if (fileInfo.Exists == true)

      {

      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

      byte[] buffer = new byte[ChunkSize];

      Response.Clear();

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

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

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

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

    while (dataLengthToRead > 0 && Response.IsClientConnected) 

      {

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

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

      Response.Flush();

      dataLengthToRead = dataLengthToRead - lengthRead;

      }

      Response.Close();

      }

      }

      //流方式下载

      protected void Button4_Click(object sender, EventArgs e)

      {

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

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

      //以字符流的形式下载文件

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

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

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

      fs.Close();

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

      //通知浏览器下载文件而不是打开

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

      Response.BinaryWrite(bytes);

      Response.Flush();

      Response.End();

      } 

    最后分享一个控件,详细资料可以参考我写的这篇文章:http://blog.ncmem.com/wordpress/2019/08/28/net%e6%96%87%e4%bb%b6%e6%89%b9%e9%87%8f%e4%b8%8b%e8%bd%bd/

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  • 原文地址:https://www.cnblogs.com/songsu/p/11428222.html
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