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

Answer 1

+3 A:

Try System.IO.Compression.DeflateStream.

Inferis 2009-02-26 23:55:01

No, DeflateStream doesn't do ZIP files. Just FYI, neither does the built-in GZipStream. Also, both these streams can exhibit anomalous compression behavior with previously-compressed or incompressible data. They can actually increase the size of the data. you've been warned!

Cheeso 2009-03-02 22:12:50

Answer 2

+21 A:

Open source: #ZipLib

I believe that the classes in the System.IO.Compression namespace are fine for compressing/decompressing a single stream of data, but there's nothing built into the framework to cope with actual zip files.

EDIT: As noted in Ants' answer, there's System.IO.Packaging.ZipPackage but it certainly looks like that's really designed for use in WPF, and wouldn't be terribly convenient to use for general zip file handling. Worth looking into though. I wasn't aware of it before though... definitely worth investigating.

Jon Skeet 2009-02-26 23:55:30

true. #ZipLib works good.

Inferis 2009-02-26 23:58:05

isn't c# 4.0 going to natively support this? i thought I had read that somewhere. But I have used ZipLib before with success.

Jon Erickson 2009-02-27 00:14:38

I don't know whether .NET 4.0 will have support for this - I wouldn't be surprised. It's still a way off though :)

Jon Skeet 2009-02-27 07:32:25

I found that the SharpZipLib API can be more complicated than it needs to be. Also it is much more than zip - tar, bzip, and i don't know what else. Maybe "too much" if you just want zip. Last, are some things missing? like progress events? AES? maybe these are coming. I'm not aware.

Cheeso 2009-03-09 22:06:16

Answer 3

+4 A:

http://www.icsharpcode.net/OpenSource/SharpZipLib/

Paul Rowland 2009-02-26 23:57:42

Answer 4

+5 A:

7Zip will help and its available in multiple languages

Oscar Cabrero 2009-02-27 00:00:06

Answer 5

+6 A:

Check out System.IO.Packaging.ZipPackage class.

Ants 2009-02-27 05:02:10

I had no idea this existed.

Inferis 2009-02-27 11:30:44

This requires things to be in a package format which requires an XML file inside the zip file that defines the layout. It's not a general purpose zip library.

Jeff Moser 2009-03-02 22:14:53

Answer 6

+4 A:

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");
        }
    }

Cheeso 2009-03-02 22:11:29

I'm very impressed with this library. Using it with great success now - thanks for the heads up.

Guy 2009-03-06 17:31:05

Answer 7

+1 A:

I will be second to recommend http://www.7-zip.org/sdk.html LZMA SDK, but it's not ZIP.

It's in public domain
It's FAST on decompression
It has fully managed implementation
It's much better compressing than ZIP/RAR
It has very small footprint
It can work as a stream

Mash 2009-04-26 08:17:58

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

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