How to Unzip all .Zip file from Folder using C# 4.0 and without using any OpenSource Dll?

Question

I have a folder containing .ZIP files. Now, I want to Extract the ZIP Files to specific folders using C#, but without using any external assembly or the .Net Framework 4.5.

I have searched, but not found any solution for unpacking *.zip files using Framework 4.0 or below.

I tried GZipStream, but it only supports .gz and not .zip files.

Solution 1

Here is example from msdn. System.IO.Compression.ZipFile is made just for that:

using System;
using System.IO;
using System.IO.Compression;

namespace ConsoleApplication
{
    class Program
    {
        static void Main(string[] args)
        {
            string startPath = @"c:\example\start";
            string zipPath = @"c:\example\result.zip";
            string extractPath = @"c:\example\extract";

            ZipFile.CreateFromDirectory(startPath, zipPath);

            ZipFile.ExtractToDirectory(zipPath, extractPath);
        }
    }
}

Edit: sorry, I missed that you're interests in .NET 4.0 and below. Required .NET framework 4.5 and above.

Solution 2

I had the same question and found a great and very simple article that solves the problem. http://www.fluxbytes.com/csharp/unzipping-files-using-shell32-in-c/

you'll need to reference the COM library called Microsoft Shell Controls And Automation (Interop.Shell32.dll)

The code (taken untouched from the article just so you see how simple it is):

public static void UnZip(string zipFile, string folderPath)
{
    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())
    {
        destinationFolder.CopyHere(file, 4 | 16);
    }
}

highly recommend reading the article- he brings an explenation for the flags 4|16

EDIT: after several years that my app, which uses this, has been running, I got complaints from two users that all of the sudden the app stopped working. it appears that the CopyHere function creates temp files/folders and these were never deleted which caused problems. The location of these files can be found in System.IO.Path.GetTempPath().