[ACCEPTED]-How do you download and extract a gzipped file with C#?-gzip

Accepted answer
Score: 29

To compress:

using (FileStream fStream = new FileStream(@"C:\test.docx.gzip", 
FileMode.Create, FileAccess.Write)) {
    using (GZipStream zipStream = new GZipStream(fStream, 
    CompressionMode.Compress)) {
        byte[] inputfile = File.ReadAllBytes(@"c:\test.docx");
        zipStream.Write(inputfile, 0, inputfile.Length);

To Decompress:

using (FileStream fInStream = new FileStream(@"c:\test.docx.gz", 
FileMode.Open, FileAccess.Read)) {
    using (GZipStream zipStream = new GZipStream(fInStream, CompressionMode.Decompress)) {   
        using (FileStream fOutStream = new FileStream(@"c:\test1.docx", 
        FileMode.Create, FileAccess.Write)) {
            byte[] tempBytes = new byte[4096];
            int i;
            while ((i = zipStream.Read(tempBytes, 0, tempBytes.Length)) != 0) {
                fOutStream.Write(tempBytes, 0, i);

Taken from a post 4 I wrote last year that shows how to decompress 3 a gzip file using C# and the built-in GZipStream 2 class. http://blogs.msdn.com/miah/archive/2007/09/05/zipping-files.aspx

As for downloading it, you can use 1 the standard WebRequest or WebClient classes in .NET.

Score: 7

You can use WebClient in System.Net to download:

WebClient Client = new WebClient ();
Client.DownloadFile("http://data.dot.state.mn.us/dds/det_sample.xml.gz", " C:\mygzipfile.gz");

then 2 use #ziplib to extract

Edit: or GZipStream... forgot 1 about that one

Score: 5

Try the SharpZipLib, a C# based library for compressing 2 and uncompressing files using gzip/zip.

Sample 1 usage can be found on this blog post:

using ICSharpCode.SharpZipLib.Zip;

FastZip fz = new FastZip();       
fz.ExtractZip(zipFile, targetDirectory,"");
Score: 4

Just use the HttpWebRequest class in the System.Net namespace 4 to request the file and download it. Then 3 use GZipStream class in the System.IO.Compression 2 namespace to extract the contents to the 1 location you specify. They provide examples.

Score: 2

The GZipStream class might be what you want.


Score: 0

You can use the HttpContext object to download a csv.gz 2 file

Convert you DataTable into string using StringBuilder (inputString)

byte[] buffer = Encoding.ASCII.GetBytes(inputString.ToString());
HttpContext.Current.Response.Buffer = true;
HttpContext.Current.Response.ContentType = "application/zip";
HttpContext.Current.Response.AddHeader("Content-Disposition", string.Format("attachment;filename={0}.csv.gz", fileName));
HttpContext.Current.Response.Filter = new GZipStream(HttpContext.Current.Response.Filter, CompressionMode.Compress);
HttpContext.Current.Response.AppendHeader("Content-Encoding", "gzip");
using (GZipStream zipStream = new GZipStream(HttpContext.Current.Response.OutputStream, CompressionMode.Compress))
    zipStream.Write(buffer, 0, buffer.Length);

You 1 can extract this downloaded file using 7Zip

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