Adding a directory to an existing .zip file

Question

First of all I would like to say that i've tried looking for the solution to this and I haven't found one where I don't have to unzip, add my folder and then zip again. I am not using any third party libraries. I would like to do this using system.io.compression if it's possible at all ... If not I would use dotnetzip as my last resort.

TL;DR. I want to be able to add directories with files in them to an already created zip file. Is this possible using the System.Io.Compression library ?

EDIT:

using (FileStream zipToOpen = new FileStream(zipfile, FileMode.Open))
{
    using (ZipArchive archive = new ZipArchive(zipToOpen, ZipArchiveMode.Update))
    {
        ZipArchiveEntry readmeEntry = archive.CreateEntry("testFolder/");
    }
}

So, using this code I am able to create a folder inside but it will be without any files in it. My question now is do I have to run this code again to get every file from my source folder to this folder inside the zip or is there a better way?

Answer 1

I managed to find a way to do this thanks to @stuartd. He pointed me to this answer https://stackoverflow.com/a/22339337/3182972 and I found a way to implement it into my code that creates directories with files inside them from a source location of said directories.

Here is the code:

   using (FileStream zipToOpen = new FileStream("c:\MyDestination\test.zip", FileMode.Open))
      {
        using (ZipArchive archive = new ZipArchive(zipToOpen, ZipArchiveMode.Update))
          {
             ZipArchiveEntry readmeEntry;
             DirectoryInfo d = new DirectoryInfo(c:\MySourceFolder);
             FileInfo[] Files = d.GetFiles("*");
             foreach (FileInfo file in Files)
             {
               readmeEntry = archive.CreateEntryFromFile("c:\MySourceFolder"+ "\\" + file.Name, "MySourceFolder" + "/" + file.Name);
             }
          }
      }

So what I did was go to my source directory and went through all of the files that are there and with a foreach cycle I added them to the destination folder in the zip file.

You can also get the source directory name with this code:

string sourcepath = "C:\MySourceFolder";
int ind = sourcepath.LastIndexOf("\\") + 1;
string folderName = sourcepath.Substring(ind, folder.Length - ind);