zip file check if they are still correct c#

Question

_{Thursday, March 29, 2018 8:53 PM}

Hi everyone,
how can i test the file if it is still correct and not damaged.
without decompressing the zip file

All replies (2)

_{Friday, March 30, 2018 2:13 PM}

The general approach to determining whether a file has been modified is an MD5 checksum. You calculate the checksum on a known, good file. Then you rerun the check when you want to verify it is still not modified.

However, unless you have a corrupt file system or something, once you write a file out to disk it isn't going to change unless another app changes it. So are you trying to detect a change in a file while your app is running or you simply want to verify someone hasn't modified the file after you?

Michael Taylor http://www.michaeltaylorp3.net

_{Friday, March 30, 2018 10:44 PM}

how can i test the file if it is still correct and not damaged.
without decompressing the zip file

I assume you want to test the integrity of the ZIP file, such as using
"Test" in 7-Zip or "Test Archive" using Total Commander or -t with pkzip.

I don't recall seeing that capability in the .NET classes which handle
ZIP files. You may need to use a 3rd-party library such as SharpZipLib.

Note the TestArchive method on this page:

https://icsharpcode.github.io/SharpZipLib/help/api/ICSharpCode.SharpZipLib.Zip.ZipFile.html

Also see:

ICSharpCode.SharpZipLib validate zip file
https://stackoverflow.com/questions/9539730/icsharpcode-sharpziplib-validate-zip-file

https://icsharpcode.github.io/SharpZipLib/

https://github.com/icsharpcode/SharpZipLib/releases

http://community.sharpdevelop.net/forums/12.aspx

• Wayne