C#使用GZipStream实现文件的压缩与解压

Console.WriteLine("压缩文件...............");      using (FileStream fr = File.OpenRead("d://test.txt"))      {        using (FileStream fw = File.OpenWrite("d://test.zip"))        {          using (GZipStream gz = new GZipStream(fw, CompressionMode.Compress))          {            byte[] by = new byte[1024 * 1024];            int r = fr.Read(by, 0, by.Length);            while (r > 0)            {              gz.Write(by, 0, r);              r = fr.Read(by, 0, r);            }          }        }      }      Console.WriteLine("压缩完成。");      Console.WriteLine("解压文件...............");      using (FileStream fr = File.OpenRead("d://test.zip"))      {        using (GZipStream gz = new GZipStream(fr, CompressionMode.Decompress))        {          using (FileStream fw = File.OpenWrite("d://test2.txt"))          {            byte[] by = new byte[1024 * 1024];            int r = gz.Read(by, 0, by.Length);            while (r > 0)            {              fw.Write(by, 0, r);              r = gz.Read(by, 0, r);            }          }        }      }Console.WriteLine("解压完成。");Console.ReadKey();