ICSharpCode.SharpZipLib 压缩后 用winrar解压的问题

Question

用ICSharpCode.SharpZipLib压缩多个文件，然后用winrar打开报“这个压缩文件格式未知或者数据已经被损坏”错误，但用360 和7zip都能打开，大神们求解啊
 internal static void DownloadForPressVer2(List<Model.FileEntity> files, string filename)
        {
            MemoryStream ms = new MemoryStream();
            ZipOutputStream zipOutput = new ZipOutputStream(ms);
            zipOutput.UseZip64 = UseZip64.Off;
            Crc32 oCrc32 = new Crc32();
            try
            {
                foreach (var file in files)
                {
                    if (!File.Exists(HttpContext.Current.Server.MapPath(file.FilePath)))
                    {
                        continue;
                    }
                    byte[] buffer = null;
                    string currentFileName = file.FileName;
                    ZipEntry oZipEntry = new ZipEntry(currentFileName);
                    oZipEntry.CompressionMethod = CompressionMethod.Deflated;                    
                    using (FileStream fs = new FileStream(HttpContext.Current.Server.MapPath(file.FilePath), FileMode.Open, FileAccess.Read))
                    {
                        buffer = new byte[fs.Length];
                        fs.Read(buffer, 0, (int) fs.Length);
                    }
                    oCrc32.Reset();
                    oCrc32.Update(buffer);
                    oZipEntry.Crc = oCrc32.Value;
                    zipOutput.PutNextEntry(oZipEntry);
                    zipOutput.Write(buffer, 0, buffer.Length);
                }
            }
            catch (Exception)
            {
                throw;
            }
            finally
            {
                zipOutput.Finish();
                zipOutput.Close();
            }
            byte[] bytes = ms.GetBuffer();
            ms.Dispose();
            DownloadFile(bytes, filename + ".zip");
        }

Answer 1

代码看不出什么错。我用winrar 3.92和SharpZipLib 0.86试下来是好的。