C# byte[]数据流/base64数据流转pdf文件

pdf转byte[]再转pdf文件进行保存
       /// <summary>
        /// pdf转byte[]再转pdf文件进行保存
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button3_Click(object sender, EventArgs e)
        {
            string cesi1 = AppDomain.CurrentDomain.BaseDirectory + "FilePath\\" + 11 + ".pdf";//测试pdf保存文件

            byte[] bytes = File.ReadAllBytes("C:\\Users\\Administrator\\Desktop\\测试.pdf");//测试pdf文件

            string strResult = byteToHexStr(bytes);//将pdf byte[]数组转16进制字符串
            this.richTextBox1.Text = strResult;
   
            byte[] byteArray = StrToHexByte(strResult);//将16进制的字符串 转为byte[]

            System.IO.File.WriteAllBytes(@cesi1, byteArray);//根据byte[]数组输出保存pdf文件
        }

        /// <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>
        /// 将16进制的字符串转为byte[]
        /// </summary>
        /// <param name="hexString"></param>
        /// <returns></returns>
        public static byte[] StrToHexByte(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(hexString.Substring(i * 2, 2), 16);
            return returnBytes;
        }

pdf base64数据流转pdf文件
方法一：
/// <summary>
        ///Base64数据流转pdf
        /// </summary>
        /// <param name="strIn"></param>
        public void Base64Pdf(string strIn)
        {
            try
            {
                var filePath = System.AppDomain.CurrentDomain.BaseDirectory.ToString();
                filePath = filePath + "PdfRecord";
                //判断是否有对应文件夹，没有则创建
                if (Directory.Exists(filePath) == false)
                {
                    Directory.CreateDirectory(filePath);
                }
                filePathSet = filePath;
                var filePathInfo = filePath + "\\" + "cesi" + DateTime.Now.ToString("yyyyMMddHHmmssfff") + ".pdf";
                base64StringToPdf(strIn, filePathInfo);
 
            }
            catch (Exception ex)
            {
                LogHelper.WriteLog(GetType(), "Base64Pdf异常错误为:" + ex.Message);
            }
        }  /// <summary>
           /// base64 转PDF
           /// </summary>
           /// <param name="base64Content"></param>
           /// <param name="filePath"></param>
        public void base64StringToPdf(String base64Content, String filePath)
        {
            try
            {
                LogHelper.WriteLog(GetType(), "进入base64StringToPdf方法，入参为：" + base64Content + "路径为：" + filePath);
 
                base64Content = base64Content.Replace("data:application/pdf;filename=generated.pdf;base64,", string.Empty);
 
                string base64ContentData = base64Content.Trim().Replace("%", "").Replace(",", "").Replace(" ", "+");
                if (base64ContentData.Length % 4 > 0)
                {
                    base64ContentData = base64ContentData.PadRight(base64ContentData.Length + 4 - base64ContentData.Length % 4, '=');
                }
                byte[] bytes = Convert.FromBase64String(base64ContentData);
 
                string location = filePath;
                System.IO.FileStream stream = new FileStream(location, FileMode.CreateNew);
                System.IO.BinaryWriter writer = new BinaryWriter(stream);
                writer.Write(bytes, 0, bytes.Length);
                writer.Close();
            }
            catch (Exception ex)
            {
                LogHelper.WriteLog(GetType(), "base64StringToPdf异常错误为:" + ex.Message);
            }
        }
方法二：
private void button1_Click(object sender, EventArgs e)
{
string fName = "C:\\Users\\Administrator\\Desktop\\bin\\Debug\\测试.pdf";
byte[] b = File.ReadAllBytes(fName);
string str = Convert.ToBase64String(b); //byte[] 转string
this.richTextBox1.Text = str;//获取base64数据流
}

private void button2_Click(object sender, EventArgs e)
{
string str = this.richTextBox1.Text;//获取base64数据流
byte[] imageBytes = Convert.FromBase64String(str);//string转byte[]
File.WriteAllBytes(@"c:\test.Pdf", imageBytes);//保存pdf文件
}