How to unzip a folder with multiple files using SSIS script task C# 2005 or 2008?

Question

There is a requirement in my project that I need to unzip some zip folder. I googled and came to know without using external libraries I can not achieve this or with G

Answer 1

I didn't want to use the 7zip approach or an external library because that makes it slightly more complicated to deploy the SSIS package. So I went with a similar approach to the Gallery Script referenced by @StackTrace and also documented here and here. I already had a Script Task performing other logic so I just needed the C# code to do it. I found that the Script Task was being executed on an MTA thread but the Shell32 code needs to execute using STA thread, so I ended up with this code. Hopefully helps someone else:

/// 

/// Ugh! SSIS runs script tasks on MTA threads but Shell32 only wants to 
/// run on STA thread. So start a new STA thread to call UnZip, block 
/// till it's done, then return. 
/// We use Shell32 since .net 2 doesn't have ZipFile and we prefer not to 
/// ship other dlls as they normally need to be deployed to the GAC. So this 
/// is easiest, although not very pretty.
/// 
/// File to unzip
/// Folder to put the unzipped files
public static void UnZipFromMTAThread(string zipFile, string folderPath)
{
    object[] args = new object[] { zipFile, folderPath };
    if (Thread.CurrentThread.GetApartmentState() == ApartmentState.STA)
    {
        UnZip(args);
    }
    else
    {
        Thread staThread = new Thread(new ParameterizedThreadStart(UnZip));
        staThread.SetApartmentState(ApartmentState.STA);
        staThread.Start(args);
        staThread.Join();
    }
}

/// 

/// From http://www.fluxbytes.com/csharp/unzipping-files-using-shell32-in-c/ but with 
/// args packed in object array so can be called from new STA Thread in UnZipFromMTAThread().
/// 
/// object array containing: [string zipFile, string destinationFolderPath]
public static void UnZip(object param)
{
    object[] args = (object[]) param;
    string zipFile = (string)args[0];
    string folderPath = (string)args[1];


    if (!File.Exists(zipFile))
        throw new FileNotFoundException();

    if (!Directory.Exists(folderPath))
        Directory.CreateDirectory(folderPath);

    Shell32.Shell objShell = new Shell32.Shell();
    Shell32.Folder destinationFolder = objShell.NameSpace(folderPath);
    Shell32.Folder sourceFile = objShell.NameSpace(zipFile);

    foreach (var file in sourceFile.Items())
    {
        // Flags are: No progress displayed, Respond with 'Yes to All' for any dialog, no UI on error
        // I added 1024 too although not sure it's relevant with Zip files. 
        // See https://msdn.microsoft.com/en-us/library/windows/desktop/bb787866%28v=vs.85%29.aspx?f=255&MSPPError=-2147217396
        destinationFolder.CopyHere(file, 4 | 16 | 1024); 
    }
}

Then you can just call it from elsewhere in a Script Task like this:

string zipFilename = "C:\\temp\\awesome-zip-file.zip";
string targetDirectory = "C:\\temp\\my-output-folder";
UnZipFromMTAThread(zipFilename, targetDirectory);