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CompressionMode Enumeration

Specifies whether to compress or decompress the underlying stream.

Namespace:  System.IO.Compression
Assembly:  System (in System.dll)
public enum CompressionMode
Member nameDescription
Supported by the .NET Compact FrameworkSupported by the XNA FrameworkDecompressDecompresses the underlying stream.
Supported by the .NET Compact FrameworkSupported by the XNA FrameworkCompressCompresses the underlying stream.

This enumeration is used with the GZipStream and DeflateStream classes.

The following code example uses the CompressionMode enumeration with the GZipStream class to compress and decompress a file.

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

namespace zip
{

    public class Program
    {

        public static void Main()
        {
            // Path to directory of files to compress and decompress.
            string dirpath = @"c:\users\public\reports";

            DirectoryInfo di = new DirectoryInfo(dirpath);

            // Compress the directory's files. 
            foreach (FileInfo fi in di.GetFiles())
            {
                Compress(fi);

            }

            // Decompress all *.gz files in the directory. 
            foreach (FileInfo fi in di.GetFiles("*.gz"))
            {
                Decompress(fi);

            }


        }

        public static void Compress(FileInfo fi)
        {
            // Get the stream of the source file. 
            using (FileStream inFile = fi.OpenRead())
            {
                // Prevent compressing hidden and already compressed files. 
                if ((File.GetAttributes(fi.FullName) & FileAttributes.Hidden)
                        != FileAttributes.Hidden & fi.Extension != ".gz")
                {
                    // Create the compressed file. 
                    using (FileStream outFile = File.Create(fi.FullName + ".gz"))
                    {
                        using (GZipStream Compress = new GZipStream(outFile,
                                CompressionMode.Compress))
                        {
                            // Copy the source file into the compression stream.
                            byte[] buffer = new byte[4096];
                            int numRead;
                            while ((numRead = inFile.Read(buffer, 0, buffer.Length)) != 0)
                            {
                                Compress.Write(buffer, 0, numRead);
                            }
                            Console.WriteLine("Compressed {0} from {1} to {2} bytes.",
                                fi.Name, fi.Length.ToString(), outFile.Length.ToString());
                        }
                    }
                }
            }
        }

        public static void Decompress(FileInfo fi)
        {
            // Get the stream of the source file. 
            using (FileStream inFile = fi.OpenRead())
            {
                // Get original file extension, for example "doc" from report.doc.gz.
                string curFile = fi.FullName;
                string origName = curFile.Remove(curFile.Length - fi.Extension.Length);

                //Create the decompressed file. 
                using (FileStream outFile = File.Create(origName))
                {
                    using (GZipStream Decompress = new GZipStream(inFile,
                            CompressionMode.Decompress))
                    {
                        //Copy the decompression stream into the output file.
                        byte[] buffer = new byte[4096];
                        int numRead;
                        while ((numRead = Decompress.Read(buffer, 0, buffer.Length)) != 0)
                        {
                            outFile.Write(buffer, 0, numRead);
                        }
                        Console.WriteLine("Decompressed: {0}", fi.Name);

                    }
                }
            }
        }

    }
}

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0

.NET Compact Framework

Supported in: 3.5

XNA Framework

Supported in: 3.0

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