How to create and fill a ZIP file using ASP.NET?

Question

Need to dynamically package some files into a .zip to create a SCORM package, anyone know how this can be done using code? Is it possible to build the folder structure dynam

Answer 1

If you're using .NET Framework 4.5 or newer you can avoid third-party libraries and use the System.IO.Compression.ZipArchive native class.

Here’s a quick code sample using a MemoryStream and a couple of byte arrays representing two files:

byte[] file1 = GetFile1ByteArray();
byte[] file2 = GetFile2ByteArray();

using (MemoryStream ms = new MemoryStream())
{
    using (var archive = new ZipArchive(ms, ZipArchiveMode.Create, true))
    {
        var zipArchiveEntry = archive.CreateEntry("file1.txt", CompressionLevel.Fastest);
        using (var zipStream = zipArchiveEntry.Open()) zipStream.Write(file1, 0, file1.Length);
        zipArchiveEntry = archive.CreateEntry("file2.txt", CompressionLevel.Fastest);
        using (var zipStream = zipArchiveEntry.Open()) zipStream.Write(file2, 0, file2.Length);
    }
    return File(ms.ToArray(), "application/zip", "Archive.zip");
}

You can use it inside a MVC Controller returning an ActionResult: alternatively, if you need to phisically create the zip archive, you can either persist the MemoryStream to disk or entirely replace it with a FileStream.

For further info regarding this topic you can also read this post on my blog.

Answer 2

Creating ZIP file "on the fly" would be done using our Rebex ZIP component.

The following sample describes it fully, including creating a subfolder:

// 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\testfile.txt");
         zip.Add(@"c:\temp\innerfile.txt", @"\subfolder");

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

         // write content of the MemoryStream (created ZIP archive) to the response stream
         ms.WriteTo(Response.OutputStream);
    }
}

// close the current HTTP response and stop executing this page
HttpContext.Current.ApplicationInstance.CompleteRequest();

Answer 3

I have used a free component from chilkat for this: http://www.chilkatsoft.com/zip-dotnet.asp. Does pretty much everything I have needed however I am not sure about building the file structure dynamically.

Answer 4

#region Create zip file in asp.net c#
        string DocPath1 = null;/*This varialble is Used for Craetting  the File path .*/
        DocPath1 = Server.MapPath("~/MYPDF/") + ddlCode.SelectedValue + "/" + txtYear.Value + "/" + ddlMonth.SelectedValue + "/";
        string[] Filenames1 = Directory.GetFiles(DocPath1);
        using (ZipFile zip = new ZipFile())
        {
            zip.AddFiles(Filenames, "Pdf");//Zip file inside filename
            Response.Clear();
            Response.BufferOutput = false;
            string zipName = String.Format("Zip_{0}.zip", DateTime.Now.ToString("yyyy-MMM-dd-HHmmss"));
            Response.ContentType = "application/zip";
            Response.AddHeader("content-disposition", "attachment; filename=" + zipName);
            zip.Save(Response.OutputStream);
            Response.End();
        }
        #endregion

Answer 5

Able to do this using DotNetZip. you can download it from the visual studio Nuget package manger or directly via the DotnetZip. then try below code,

     /// <summary>
    /// Generate zip file and save it into given location
    /// </summary>
    /// <param name="directoryPath"></param>
    public void CreateZipFile(string directoryPath )
    {
        //Select Files from given directory
        List<string> directoryFileNames = Directory.GetFiles(directoryPath).ToList();
        using (ZipFile zip = new ZipFile())
        {
            zip.AddFiles(directoryFileNames, "");
            //Generate zip file folder into loation
            zip.Save("C:\\Logs\\ReportsMyZipFile.zip");
        }
    }

If you want to download the file into client,use below code.

/// <summary>
    /// Generate zip file and download into client
    /// </summary>
    /// <param name="directoryPath"></param>
    /// <param name="respnse"></param>
    public void CreateZipFile(HttpResponse respnse,string directoryPath )
    {
        //Select Files from given directory
        List<string> directoryFileNames = Directory.GetFiles(directoryPath).ToList();
        respnse.Clear();
        respnse.BufferOutput = false;
        respnse.ContentType = "application/zip";
        respnse.AddHeader("content-disposition", "attachment; filename=MyFiles.zip");

        using (ZipFile zip = new ZipFile())
        {
            zip.CompressionLevel = CompressionLevel.None;
            zip.AddFiles(directoryFileNames, "");
            zip.Save(respnse.OutputStream);
        }

        respnse.flush();
    }

Answer 6

DotNetZip is very easy to use... Creating Zip files in ASP.Net