C#中用SharpZipLib生成gzip/解压文件

using System;
using System.IO;
using ICSharpCode.SharpZipLib.GZip;
using ICSharpCode.SharpZipLib.Core;

namespace CNKIDataExport
{
    class Program
    {
        public static void gZipFile(string filePath, string zipFilePath)
        {
            Stream s = new GZipOutputStream(File.Create(zipFilePath));
            FileStream fs = File.OpenRead(filePath);
            int size;
            byte[] buf = new byte[4096];
            do
            {
                size = fs.Read(buf, 0, buf.Length);
                s.Write(buf, 0, size);
            } while (size > 0);
            s.Close();
            fs.Close();
        }

        public static void gunZipFile(string zipFilePath, string filePath)
        {
            using (Stream inStream = new GZipInputStream(File.OpenRead(zipFilePath)))
            using (FileStream outStream = File.Create(filePath))
            {
                byte[] buf = new byte[4096];
                StreamUtils.Copy(inStream, outStream, buf);
            }
        }

        static void Main(string[] args)
        {
            string src = @"D:\test\in.txt"
            string dest = @"D:\test\out.gz"
            string ori = @"D:\test\ori.txt"

            gZipFile(src, dest);
            Console.WriteLine("gzip over!");
            gunZipFile(dest, ori);
            Console.WriteLine("gunzip over!");
            Console.ReadKey();
        }
    }
}