//引入命名空间
using System;
using System.IO;
using System.IO.Compression;

public class Program
{
    private static string directoryPath = @".\temp";
    public static void Main()
    {
        DirectoryInfo directorySelected = new DirectoryInfo(directoryPath);
        Compress(directorySelected);

        foreach (FileInfo fileToDecompress in directorySelected.GetFiles("*.gz"))
        {
            Decompress(fileToDecompress);
        }
    }

    public static void Compress(DirectoryInfo directorySelected)
    {
        foreach (FileInfo fileToCompress in directorySelected.GetFiles())
        {
            using (FileStream originalFileStream = fileToCompress.OpenRead())
            {
                if ((File.GetAttributes(fileToCompress.FullName) & 
                   FileAttributes.Hidden) != FileAttributes.Hidden & fileToCompress.Extension != ".gz")
                {
                    using (FileStream compressedFileStream = File.Create(fileToCompress.FullName + ".gz"))
                    {
                        using (GZipStream compressionStream = new GZipStream(compressedFileStream, 
                           CompressionMode.Compress))
                        {
                            originalFileStream.CopyTo(compressionStream);
                        }
                    }
                    FileInfo info = new FileInfo(directoryPath + Path.DirectorySeparatorChar + fileToCompress.Name + ".gz");
                    Console.WriteLine($"Compressed {fileToCompress.Name} from {fileToCompress.Length.ToString()} to {info.Length.ToString()} bytes.");
                }
            }
        }
    }

    public static void Decompress(FileInfo fileToDecompress)
    {
        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}");
                }
            }
        }
    }
}

//引入命名空间
using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.IO.Compression;

class Program {
    static void SaveCompressedFile(string filename, string data) {
        FileStream fileStream = new FileStream(filename, FileMode.Create, FileAccess.Write);
        GZipStream compressionStream = new GZipStream(fileStream, CompressionMode.Compress);
        StreamWriter writer = new StreamWriter(compressionStream);
        writer.Write(data);
        writer.Close();
    }

    static string LoadCompressedFile(string filename) {
        FileStream fileStream = new FileStream(filename, FileMode.Open, FileAccess.Read);
        GZipStream compressionStream = new GZipStream(fileStream, CompressionMode.Decompress);
        StreamReader reader = new StreamReader(compressionStream);
        string data = reader.ReadToEnd();
        reader.Close();
        return data;
    }

    static void Main(string[] args) {
        try {
            string filename = "compressedFile.txt";
            string sourceString = "Source String";
            SaveCompressedFile(filename, sourceString);
            FileInfo compressedFileData = new FileInfo(filename);
            string recoveredString = LoadCompressedFile(filename);
        } catch (IOException ex) {
            Console.WriteLine(ex.ToString());
        }
    }
}