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I need to dynamically create a ZIP archive, add files to it (into different folders). This file will be sent to user's browser. Ideally without any temporary disk file.

Applies to: Rebex ZIP

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Best answer

Creating ZIP file "on the fly" is simple using Rebex ZIP component. Check out the following sample code:

// prepare MemoryStream to create ZIP archive within
using (MemoryStream ms = new MemoryStream())
    // create new ZIP archive within prepared MemoryStream
    using (ZipArchive zip = new ZipArchive(ms))
         // add some files to ZIP archive
         zip.Add(@"c:\temp\innerfile.txt", @"\subfolder");

         // clear response stream and set the response header and content type
         Response.ContentType = "application/zip";
         Response.AddHeader("content-disposition", "filename=sample.zip");

         // write content of the MemoryStream (created ZIP archive) 
         // to the response stream

// close the current HTTP response and stop executing this page