ASP.NET Download all files as Zip

Question

I have a folder on my web server in which there are hundreds of mp3 files. I would like to give the user the opportunity to download the zip archive from each mp3 to a directory from a web page.

I want to compile files programmatically only when necessary. Since the zip file will be quite large, I think I will need to send the zip file to the response stream , since it will be zipped for performance reasons.

Is it possible? How can i do this?

Answer 1

Here is the code I use to do this with DotNetZip - it works very well. Obviously, you will need to provide variables for outputFileName, folderName and includeSubFolders.

response.ContentType = "application/zip"; response.AddHeader("content-disposition", "attachment; filename=" + outputFileName); using (ZipFile zipfile = new ZipFile()) { zipfile.AddSelectedFiles("*.*", folderName, includeSubFolders); zipfile.Save(response.OutputStream); } 

Answer 2

I can’t believe how easy it was. After reading this , here is the code I used:

 protected void Page_Load(object sender, EventArgs e) { Response.Clear(); Response.BufferOutput = false; Response.ContentType = "application/zip"; Response.AddHeader("content-disposition", "attachment; filename=pauls_chapel_audio.zip"); using (ZipFile zip = new ZipFile()) { zip.CompressionLevel = CompressionLevel.None; zip.AddSelectedFiles("*.mp3", Server.MapPath("~/content/audio/"), "", false); zip.Save(Response.OutputStream); } Response.Close(); } 

Answer 3

You can add a custom handler (.ashx file) that takes the file path, reads the file, compresses it using the compression library, and returns bytes to the end user with the correct content type.

Answer 4

  foreach (GridViewRow gvrow in grdUSPS.Rows) { CheckBox chk = (CheckBox)gvrow.FindControl("chkSelect"); if (chk.Checked) { string fileName = gvrow.Cells[1].Text; string filePath = Server.MapPathfilename); zip.AddFile(filePath, "files"); } } Response.Clear(); Response.AddHeader("Content-Disposition", "attachment; filename=DownloadedFile.zip"); Response.ContentType = "application/zip"; zip.Save(Response.OutputStream); Response.End();