1、多檔案加密壓縮

 //計算總條數
            byte[] fileCountBytes = Encoding.UTF8.GetBytes(list.Count.ToString());
            byte[] countSizeBytes = BitConverter.GetBytes(fileCountBytes.Length);
            ms.Write(countSizeBytes, 0, countSizeBytes.Length);
            ms.Write(fileCountBytes, 0, fileCountBytes.Length);
            
 
foreach (var item in list)
            {
                if (!File.Exists(item.FullPath)) continue;
                byte[] fileNameBytes = Encoding.UTF8.GetBytes(item.PathUrl);
                //rsa加密
                fileNameBytes = RSAHelper.RsaEncrpyt(fileNameBytes, key);
                byte[]sizeBytes = BitConverter.GetBytes(fileNameBytes.Length);
                ms.Write(sizeBytes, 
 
0, sizeBytes.Length);
                ms.Write(fileNameBytes, 0, fileNameBytes.Length);
                byte[] fileContentBytes = File.ReadAllBytes(item.FullPath);
                ms.Write(BitConverter.GetBytes(fileContentBytes.Length), 0, 4);
                ms.Write(fileContentBytes, 0, fileContentBytes.Length);
            }
            ms.Flush();
            ms.Position 
 
= 0;
            using (FileStream fs = File.Create(saveFullPath))
            {
                using (GZipStream zipStream = new GZipStream(fs, CompressionMode.Compress))
                {
                    ms.CopyTo(zipStream);
                }
            }
            ms.Close();