How can you compress or decompress files in C#?

Question

ICSM Computer · Answer

In C#, you can compress and decompress files using classes from the System.IO.Compression namespace, such as
GZipStream and ZipFile.
Option 1: GZip – Compress/Decompress a Single File
Compress with GZipStream:
using System;
using System.IO;
using System.IO.Compression;
class Program
{
    static void Main()
    {
        string sourceFile = "example.txt";
        string compressedFile = "example.txt.gz";
        using (FileStream originalFileStream = File.OpenRead(sourceFile))
        using (FileStream compressedFileStream = File.Create(compressedFile))
        using (GZipStream compressionStream = new GZipStream(compressedFileStream, CompressionMode.Compress))
        {
            originalFileStream.CopyTo(compressionStream);
        }
        Console.WriteLine("File compressed.");
    }
}
Decompress:
string compressedFile = "example.txt.gz";
string decompressedFile = "example_decompressed.txt";
using (FileStream compressedFileStream = File.OpenRead(compressedFile))
using (FileStream decompressedFileStream = File.Create(decompressedFile))
using (GZipStream decompressionStream = new GZipStream(compressedFileStream, CompressionMode.Decompress))
{
    decompressionStream.CopyTo(decompressedFileStream);
}
Console.WriteLine("File decompressed.");
Option 2: Zip – Compress/Extract Multiple Files or Folders
Create a Zip Archive:
using System.IO.Compression;
ZipFile.CreateFromDirectory(@"C:\SourceFolder", @"C:\output.zip");
Extract a Zip Archive:
ZipFile.ExtractToDirectory(@"C:\output.zip", @"C:\ExtractedFolder");
Add a reference to System.IO.Compression.FileSystem.dll if you're targeting .NET Framework.
Notes:
Use GZipStream for compressing a single file (stream-based).Use ZipFile for full folder compression/extraction (archive-based).Compression helps reduce disk usage and speeds up data transfer.
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How can you compress or decompress files in C#?

ICSM Computer

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1 Answers

Option 1: GZip – Compress/Decompress a Single File

Compress with `GZipStream`:

Decompress:

Option 2: Zip – Compress/Extract Multiple Files or Folders

Create a Zip Archive:

Extract a Zip Archive:

Notes:

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