Code tells all：

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();        }    }}

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