Using System.IO.Packaging to generate a ZIP file

Question

I know that the likes of the DotNetZip or SharpZipLib libraries are usually recommended for creating ZIP files in a .net language (C# in my case), but it's not impossible to use System.IO.Packaging to generate a ZIP file. I thought it might be nice to try and develop a routine in C# which could do it, without the need to download any external libraries. Does anyone have a good example of a method or methods that will use System.IO.Packaging to generate a ZIP file?

Ere

OK, after reading around a bit, it looks like the awkwardness of using System.IO.Packaging isn't the only reason people avoid it like the plague; it also generates a silly [Content_Types].xml file in every zip in generates, and there are serious question marks as to its compatibility with other zip file clients. So... I guess I'll be using DotNetZip. :-) – Ere

Answer 1

let me google this for you -> system.io.packaging+generate+zip

first link http://weblogs.asp.net/jongalloway//creating-zip-archives-in-net-without-an-external-library-like-sharpziplib

using System;
using System.IO;
using System.IO.Packaging;

namespace ZipSample
{
    class Program
    {
        static void Main(string[] args)
        {
            AddFileToZip("Output.zip", @"C:\Windows\Notepad.exe");
            AddFileToZip("Output.zip", @"C:\Windows\System32\Calc.exe");
        }

        private static void AddFileToZip(string zipFilename, string fileToAdd, CompressionOption compression = CompressionOption.Normal)
        {
            using (Package zip = System.IO.Packaging.Package.Open(zipFilename, FileMode.OpenOrCreate))
            {
                string destFilename = ".\\" + Path.GetFileName(fileToAdd);
                Uri uri = PackUriHelper.CreatePartUri(new Uri(destFilename, UriKind.Relative));
                if (zip.PartExists(uri))
                {
                    zip.DeletePart(uri);
                }
                PackagePart part = zip.CreatePart(uri, "", compression);
                using (FileStream fileStream = new FileStream(fileToAdd, FileMode.Open, FileAccess.Read))
                {
                    using (Stream dest = part.GetStream())
                    {
                        fileStream.CopyTo(dest);
                    }
                }
            }
        }              
    }
}

Shilling

Sure, but this doesn't take a path, and add all its directories and files into the ZIP; one must specify the individual files manually. – Ere

Really you cannot implement it yourself ? :S – Shilling

Look - Listing files in a directory in C# csharpfriends.com/Articles/getArticle.aspx?articleID=356 – Shilling

you dont, all the code is in my reply and my comment above, just use it and for each file from DirectoryInfo use AddFileToZip ... :P – Shilling

OK, after reading around a bit, it looks like the awkwardness of using System.IO.Packaging isn't the only reason people avoid it like the plague; it also generates a silly [Content_Types].xml file in every zip in generates, and there are serious question marks as to its compatibility with other zip file clients. So... I guess I'll be using DotNetZip. :-) – Ere

Nice, thanks for this.Just want to mention that to use this code you must add a reference to WindowsBase dll to be able to use System.IO.Packaging – Casuistry

ironically, i googled exactly "create zip System.IO.Packaging" and it showed this thread first. you broke it. – Halhalafian

me thinks that last line should read: bytesWritten += bytesRead; – Cuckoo

@Cuckoo - or: both lines containing bytesWritten can be omitted – Fronniah

"let me google this for you..." Wow, could you be more condescending if you tried? The way this answer is phrased is only one or two steps above a LMGTFY link, which Stack Overflow frowns upon. – Hindquarter

"Let me google this for you..." Seriously ? Please read this ! meta.stackexchange.com/questions/9953/… You answer is correct, thanks, but your behavior is horrible -> downvote – Uranie

Answer 2

In .NET Framework 4.5 you can use the new classes in the System.IO.Compression namespace.

Movement