Partsource/PartSource.Backoffice/Services/GZipService.cs

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

namespace PartSource.Backoffice.Services
{
  
    public class GZipService
    {
        public static void Decompress(string path)
        {
            FileInfo fileToDecompress = new FileInfo(path);

            using (FileStream originalFileStream = fileToDecompress.OpenRead())
            {
                string currentFileName = fileToDecompress.FullName;
                string newFileName = currentFileName.Remove(currentFileName.Length - fileToDecompress.Extension.Length);

                using (FileStream decompressedFileStream = File.Create(newFileName))
                {
                    using (GZipStream decompressionStream = new GZipStream(originalFileStream, CompressionMode.Decompress))
                    {
                        decompressionStream.CopyTo(decompressedFileStream);
                        Console.WriteLine($"Decompressed: {fileToDecompress.Name}");
                    }
                }
            }
        }
    }
}