Question

Is there a built-in zip library in .NET 3.5?

If not, what are the popular open source .net zip libraries.

Answer 1

There is no built-in library. There are open-source options.

DotNetZip is one. Simple, easy to use. It has good features: AES Encryption, regular encryption, streams, ZIP64, file comments, Unicode, progress events, more. And it’s free and open source.

Here’s some sample code.

    // extract all Photoshop files larger than 100mb     using (ZipFile zip1 = ZipFile.Read(ZipFileName))     {         var LargePhotoShopFiles = zip1.SelectEntries('name = *.psd  and size > 100mb');         foreach (ZipEntry e in LargePhotoShopFiles)         {             if (e.UsesEncryption)                 e.ExtractWithPassword('unpackDirectory', 'VerySecret!');             else                  e.Extract('unpackDirectory');         }     }