超怪！GZipStream压缩文件夹后里面的文件扩展名没了，怎么办啊，各位朋友帮帮忙

Question

我用GZipStream压缩文件夹后，发现原来文件夹中的文件扩展名没了，怎么办啊？？？？这是代码： 这是文件夹路径  string path = Server.MapPath("../../../UpLoads/Attachment/" + attachment);
 这是压缩后文件路径  string fileName =path + ".rar";
  
 Compress(path, fileName);
  public  void Compress(string dirPath, string fileName)
    {
        ArrayList list = new ArrayList();
        foreach (string f in Directory.GetFiles(dirPath))
        {
            byte[] destBuffer = File.ReadAllBytes(f);
            SerializeFileInfo sfi = new SerializeFileInfo(f, destBuffer);
            list.Add(sfi);
        }
        IFormatter formatter = new BinaryFormatter();
        using (Stream s = new MemoryStream())
        {
            formatter.Serialize(s, list);
            s.Position = 0;
            CreateCompressFile(s, fileName);
        }
    } private  void CreateCompressFile(Stream source, string destinationName)
    {
        using (Stream destination = new FileStream(destinationName, FileMode.Create, FileAccess.Write))
        {
            using (GZipStream output = new GZipStream(destination, CompressionMode.Compress))
            {
                byte[] bytes = new byte[4096];
                int n;
                while ((n = source.Read(bytes, 0, bytes.Length)) != 0)
                {
                    output.Write(bytes, 0, n);
                }
            }
        }
     }  [Serializable]
   public class SerializeFileInfo
    {
        public SerializeFileInfo(string name, byte[] buffer)
        {
            fileName = name;
            fileBuffer = buffer;
        }
        string fileName;
        public string FileName
        {
            get
            {
                return fileName;
            }
        }
        byte[] fileBuffer;
        public byte[] FileBuffer
        {
            get
            {
                return fileBuffer;
            }
        }    }

Answer 1

一股脑地把 byte[] 堆成一堆去了？！改变你的 list 类型设计，让它保存文件名。

Answer 2

 using (FileStream fs = new FileStream(filepath,FileMode.Open))
        {
            byte[] bytes = new byte[fs.Length];
            fs.Read(bytes, 0, bytes.Length);
            
            using (FileStream outfile = File.Create(Path.ChangeExtension(filepath, "zip")))
            {
                using (GZipStream zipStream = new GZipStream(outfile, CompressionMode.Compress))
                {
                    zipStream.Write(bytes, 0, bytes.Length);
                }
            
            }
        }
还可使用SharpZipLib解压缩
private static bool ZipFileDictory(string FolderToZip, ZipOutputStream s, string ParentFolderName)
        {
            bool res = true;
            string[] folders, filenames;
            ZipEntry entry = null;
            FileStream fs = null;
            Crc32 crc = new Crc32();
            try
            {
                entry = new ZipEntry(Path.Combine(ParentFolderName, Path.GetFileName(FolderToZip) + "/"));
                s.PutNextEntry(entry);
                s.Flush();
                filenames = Directory.GetFiles(FolderToZip);
                foreach (string file in filenames)
                {
                    fs = File.OpenRead(file);                    byte[] buffer = new byte[fs.Length];
                    fs.Read(buffer, 0, buffer.Length);
                    entry = new ZipEntry(Path.Combine(ParentFolderName, Path.GetFileName(FolderToZip) + "/" + Path.GetFileName(file)));                    entry.DateTime = DateTime.Now;
                    entry.Size = fs.Length;
                    fs.Close();                    crc.Reset();
                    crc.Update(buffer);                    entry.Crc = crc.Value;                    s.PutNextEntry(entry);                    s.Write(buffer, 0, buffer.Length);
                }
            }
            catch
            {
                res = false;
            }
            finally
            {
                if (fs != null)
                {
                    fs.Close();
                    fs = null;
                }
                if (entry != null)
                {
                    entry = null;
                }
                GC.Collect();
                GC.Collect(1);
            }
            folders = Directory.GetDirectories(FolderToZip);
            foreach (string folder in folders)
            {
                if (!ZipFileDictory(folder, s, Path.Combine(ParentFolderName, Path.GetFileName(FolderToZip))))
                {
                    return false;
                }
            }            return res;
        }
        private static bool ZipFileDictory(string FolderToZip, string ZipedFile, String Password)
        {
            bool res;
            if (!Directory.Exists(FolderToZip))
            {
                return false;
            }            ZipOutputStream s = new ZipOutputStream(File.Create(ZipedFile));
            s.SetLevel(6);
            s.Password = Password;            res = ZipFileDictory(FolderToZip, s, "");            s.Finish();
            s.Close();            return res;
        }
        private static bool ZipFile(string FileToZip, string ZipedFile, String Password)
        {
            if (!File.Exists(FileToZip))
            {
                throw new System.IO.FileNotFoundException("压缩的文件: " + FileToZip + " 不存在!");
            }
            FileStream ZipFile = null;
            ZipOutputStream ZipStream = null;
            ZipEntry ZipEntry = null;            bool res = true;
            try
            {
                ZipFile = File.OpenRead(FileToZip);
                byte[] buffer = new byte[ZipFile.Length];
                ZipFile.Read(buffer, 0, buffer.Length);
                ZipFile.Close();                ZipFile = File.Create(ZipedFile);
                ZipStream = new ZipOutputStream(ZipFile);
                ZipStream.Password = Password;
                ZipEntry = new ZipEntry(Path.GetFileName(FileToZip));
                ZipStream.PutNextEntry(ZipEntry);
                ZipStream.SetLevel(6);                ZipStream.Write(buffer, 0, buffer.Length);
            }
            catch
            {
                res = false;
            }
            finally
            {
                if (ZipEntry != null)
                {
                    ZipEntry = null;
                }
                if (ZipStream != null)
                {
                    ZipStream.Finish();
                    ZipStream.Close();
                }
                if (ZipFile != null)
                {
                    ZipFile.Close();
                    ZipFile = null;
                }
                GC.Collect();
                GC.Collect(1);
            }
            return res;
        }
参考