How to zip multiple files using only .net api in c

Question

I like to zip multiple files which are being created dynamically in my web application. Those files should be zipped. For this, i dont want to use any third-party tools. just like to use .net api in c#

Answer 1

You could always call a third-party executable like 7-zip with an appropriate command line using the System.Diagnostics.Process class. There's no interop that way because you're just asking the OS to launch a binary.

Answer 2

Well you can zip the files using following function you have to just pass the file bytes and this function will zip the file bytes passed as parameter and return the zipped file bytes.

 public static byte[] PackageDocsAsZip(byte[] fileBytesTobeZipped, string packageFileName)
{
    try
    {
        string parentSourceLoc2Zip = @"C:\\\\UploadedDocs"\SG-ACA OCI Packages";
        if (Directory.Exists(parentSourceLoc2Zip) == false)
        {
            Directory.CreateDirectory(parentSourceLoc2Zip);
        }

        //if destination folder already exists then delete it
        string sourceLoc2Zip = string.Format(@"{0}\{1}", parentSourceLoc2Zip, packageFileName);
        if (Directory.Exists(sourceLoc2Zip) == true)
        {
            Directory.Delete(sourceLoc2Zip, true);
        }
        Directory.CreateDirectory(sourceLoc2Zip);



             FilePath = string.Format(@"{0}\{1}",
                    sourceLoc2Zip,
                    "filename.extension");//e-g report.xlsx , report.docx according to exported file

             File.WriteAllBytes(FilePath, fileBytesTobeZipped);




        //if zip already exists then delete it
        if (File.Exists(sourceLoc2Zip + ".zip"))
        {
            File.Delete(sourceLoc2Zip + ".zip");
        }

        //now zip the source location
        ZipFile.CreateFromDirectory(sourceLoc2Zip, sourceLoc2Zip + ".zip", System.IO.Compression.CompressionLevel.Optimal, true);

        return File.ReadAllBytes(sourceLoc2Zip + ".zip");
    }
    catch
    {
        throw;
    }
}

Now if you want to export this zip bytes created for user to download you can call this function using following lines

    Response.Clear();
    Response.AddHeader("content-disposition", "attachment; filename=Report.zip");
    Response.ContentType = "application/zip";
    Response.BinaryWrite(PackageDocsAsZip(fileBytesToBeExported ,"TemporaryFolderName"));
    Response.End();

Answer 3

Simple zip file with flat structure:

using System.IO;
using System.IO.Compression;

private static void CreateZipFile(IEnumerable<FileInfo> files, string archiveName)
{
    using (var stream = File.OpenWrite(archiveName))
    {
        using (ZipArchive archive = new ZipArchive(stream, System.IO.Compression.ZipArchiveMode.Create))
        {
             foreach (var item in files)
             {
                 archive.CreateEntryFromFile(item.FullName, item.Name, CompressionLevel.Optimal);                       
             }
         }
    }
}

You need to add reference to System.IO.Compression and System.IO.Compression.FileSystem