【下载】asp.net C#实现下载文件的六种方法实例-文件

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asp.net C#实现下载文件的六种方法实例

protected void Button1_Click(object sender, EventArgs e)
  {
 

  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)
  {
 

  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();

  } 

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