Getting error on System.IO.Compression when trying to use ZipFile class

Question

I am using ZipFile class.

A reference/dll must be added in order to use this class. It seems that you can use both the System.IO.Compression and the Ionic.Zip dll (one at a time ofcourse).

In my case, only the latter works. The problem though, is that the Ionic.Zip doesn't seem to have the method: ExtracToFile(...) which overwrites an existing file. I need this method badly. Instead, I can only do:

zip.Extract(extractDirectory); (Then I get an error saying the file already exist)

If I do:

zip.ExtractToFile(extractDirectory);

I get an error saying that the method ExtractToFile does not exist.

Another thing to note, is that doing Using System.IO.Compression, I get an error when I do:

var zip = ZipFile.Read(finalFileToUnzip)

which says that it can't find ZipFile (although I did add the dll as a reference, doing "Add Reference -> and selecting the .dll file")

If I do Using Ionic.Zip, it will accept: var zip = ZipFile.Read(finalFileToUnzip)

I am not able to find any info or previous posts about this issue, I hope anyone can help

Any idea about what might be the problem?

Here is more code:

for (int i = 0; i < listWithZipToUnpack.Count; ++i)
{
    extractDirectory = Path.Combine(projectPath.ToString(), pathDir + listWithZipToUnpack[i]);

    var finalFileToUnzip = Path.Combine(projectPath.ToString(), pathDir, "Lely", listWithZipToUnpack[i]);

    if (finalFileToUnzip.Equals("--Vælg fil--")) { continue; }

    using (var zip = ZipFile.OpenRead(finalFileToUnzip))
    {
        if (!Directory.Exists(extractDirectory))
        {
            Directory.CreateDirectory(extractDirectory+"-"+listWithZipToUnpack[i]);
        }

        foreach (var zipArchiveEntry in zip.Entries)
        {
            zipArchiveEntry.ExtractToFile(extractDirectory);
        }
    }
}

I am using .NET framework 4.5.2

Answer 1

I solved it. The problem is that it is not enough to only add System.IO.Compression to references, you must also add System.IO.Compression.Filesystem