C#将文件转成16进制码流写入数据库存起来，访问的时候再还原成PDF文件

来源：互联网发布：大数据掌握的技术编辑：程序博客网时间：2024/06/08 09:27

C#将文件转成16进制码流写入数据库存起来，访问的时候再还原成PDF文件。

适合将文件写入数据库，远程访问的时候还原

首先把文件转成十六进制文件流

            public void FileToStream()        {            try            {                IPdfClassBll pdfClassBll = DataFactory.GetPdfClass();                FileStream fs = new FileStream(@"文件路径/***.PDF", FileMode.Open);                BinaryReader br = new BinaryReader(fs);                Byte[] byData = br.ReadBytes((int)fs.Length);                StringBuilder strResult = new StringBuilder(byData.Length * 8);                string binary = byteToHexStr(byData);                PdfInfo pdfinfo = new PdfInfo();                pdfinfo.PRTNUM = "PH001";//创建的新文件名                pdfinfo.PDFREPORT = binary;                pdfClassBll.Add(pdfinfo);                fs.Close();                br.Close();            }            catch (Exception ex)            {                MessageBox.Show("文件写入失败~！");            }        }        /// <summary>        /// 字节数组转16进制字符串        /// </summary>        /// <param name="bytes"></param>        /// <returns></returns>        public static string byteToHexStr(byte[] bytes)        {            string returnStr = "";            if (bytes != null)            {                for (int i = 0; i < bytes.Length; i++)                {                    returnStr += bytes[i].ToString("X2");                }            }            return returnStr;        }        /// <summary>

2.读取数据库中的 PDF流 信息，并写入文件=======================        public void StreamToFile(string prtnum)        {            try            {                //写入位置                SampleConfig config = MonitorConfigManager.GetInstance().GetSampleConfig();                string reportPath = config.ReportPath;                reportPath = reportPath + "\\" + oSampleInfo.PRTNUM + ".pdf";                IPdfClassBll pdfClassBll = DataFactory.GetPdfClass();                PdfInfo pdfInfo = pdfClassBll.GetPdfReportByPRTNUM(prtnum);                string strPdf = pdfInfo.PDFREPORT;                byte[] bytes = strToToHexByte(strPdf);                FileStream fileStream = new FileStream(reportPath, FileMode.OpenOrCreate, FileAccess.Write);                fileStream.Write(bytes, 0, bytes.Length);                BinaryWriter binaryWriter = new BinaryWriter(fileStream);                binaryWriter.Write(bytes);                binaryWriter.Close();                fileStream.Close();            }            catch (Exception ex)            {            }        }        /// <summary>        /// 16进制字符串转为文字        /// </summary>        /// <param name="hexString"></param>        /// <returns></returns>        private static byte[] strToToHexByte(string hexString)        {            hexString = hexString.Replace(" ", "");            if ((hexString.Length % 2) != 0)                hexString += " ";            byte[] returnBytes = new byte[hexString.Length / 2];            for (int i = 0; i < returnBytes.Length; i++)                returnBytes[i] = Convert.ToByte(hexStringSubstring(i * 2, 2), 16);   return returnBytes;        }

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