.Net Framework under 4.0, how to zip files without 3rd party libraries

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Hello world!

Hope you can help me with some experience, I'd appreciate this very much.

I've been stuck in a problem... I need to zip files (specifically zip format) in .Net Framework 3.5 or earlier with just code (no 3rd party libraries). Whether it's VB.Net or C# it doesn't matter.
I googled and everything but it all seems to lead to 3rd party libraries and stuff.

Links are welcome as solution as well.

Thank you so much for this!

Posted 13-Aug-14 6:51am

Homero Rivera

Updated 13-Aug-14 7:41am

v2

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Homero Rivera 15-Aug-14 10:29am

Well, there are no absolute answers in a problem like this. I think all answers are valid, in consideration there is no straight way to a right answer. Thank you all!

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Abhinav S · Accepted Answer · 2014-08-13T07:00:00

Solution 1

Worth a try - Compress/Decompress Zip Files without Third-party Libraries in C#[^].

Posted 13-Aug-14 7:00am

Abhinav S

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Sergey Alexandrovich Kryukov 13-Aug-14 13:13pm

Interesting approach, my 5. However, it has some problems compared to 3rd-party open-source library: a bit too much of platform dependency; the performance can be compromised. So, those 3rd-party libraries have their big benefits, that's why I added my alternative answer; please see.
—SA

Homero Rivera 13-Aug-14 13:58pm

on hold

Sergey Alexandrovich Kryukov · Accepted Answer · 2014-08-13T07:11:00

Solution 2

You can use 3rd-party open-source libraries. Please see my past answers:
Extract file rar with vb.net[^],
Compare between two folders[^].

(Sorry I did not notice your "without 3rd-party libraries" part of your question title; then I would ask: why not using them. :-))

—SA

Posted 13-Aug-14 7:11am

Sergey Alexandrovich Kryukov

Updated 13-Aug-14 11:41am

v2

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Homero Rivera 13-Aug-14 13:19pm

Open source is good too, as we can see what's written in there. I'm still looking at all solutions, thank you!

Sergey Alexandrovich Kryukov 13-Aug-14 13:23pm

Please review them, and I hope you will later accept the answer formally (green "Accept" button).
—SA

Homero Rivera 13-Aug-14 13:58pm

on hold

Kornfeld Eliyahu Peter · Accepted Answer · 2014-08-13T12:09:00

As you do not wan't to use 3rd party libraries and no .NET over 3.5 you have some problems...
System.IO.Compression[^] namespace have a DeflateStream and GZipStream class - since .NET 2.0 - to compressing files. As deflate[^] is the original algorithm for PKZIP (the grandfather of modern zip) so any tool capable to read zip will read it happily...It's not exactly a modern zip format in the meaning of ability, but it is compatible with, so you may go with it...

.Net Framework under 4.0, how to zip files without 3rd party libraries

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