Modifying an existing Zip file using C#

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How do you modify or add files to an existing Zip file using C#?

Do you have to extract everything in that zip file and then remake the zip with the old files and new files?

Posted 2-Jun-11 5:11am

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Pete O'Hanlon 3-Jun-11 8:08am

My apologies for not rating this question sooner. It's an excellent question, so have a 5.

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Pete O'Hanlon · Accepted Answer · 2011-06-02T05:36:00

If you use SharpZipLib[^], you can use the following extension method:

C#

public static void UpdateZip(this ZipFile zipFile, List<string> files)
{
  zipFile.BeginUpdate();
  foreach(string file in files)
  {
    if (File.Exists(file))
    {
      zipFile.Add(file);
    }
  }
  zipFile.CommitUpdate();
  zipFile.Close();
}

To call it, all you need do is:

C#

List<string> myList = new List<string>();
myList.Add(@"c:\temp\myfile.txt");
myList.Add(@"c:\temp\myFile2.txt");
ZipFile zip = new ZipFile("path to file");
zip.UpdateZip(myList);