文件-- 字节相互转换(word、图片、pdf...)

方式一：

  /// <summary>
        /// word文件转换二进制数据(用于保存数据库)
        /// </summary>
        /// <param name="wordPath">word文件路径</param>
        /// <returns>二进制</returns>
        public byte[] WordConvertByte(string wordPath)
        {
            if (!File.Exists(wordPath))
            {
                return null;
            }
            byte[] bytContent = null;
            System.IO.FileStream fs = null;
            System.IO.BinaryReader br = null;
            try
            {
                fs = new FileStream(wordPath, System.IO.FileMode.Open);
                br = new BinaryReader((Stream)fs);
                bytContent = br.ReadBytes((Int32)fs.Length);
                fs.Close();
                br.Close();
            }
            catch
            {
                fs.Close();
                br.Close();
                return null;
            }
            return bytContent;
        }

        /// <summary>
        ///二进制数据转换为word文件
        /// </summary>
        /// <param name="data">二进制数据</param>
        /// <param name="fileName">word文件名</param>
        /// <returns>word保存的相对路径</returns>
        public string ByteConvertWord(byte[] data, string fileName)
        {
            if (data == null) return string.Empty;

            FileStream fs = null;
            BinaryWriter br = null;
            try
            {
                fs = new FileStream(fileName, FileMode.OpenOrCreate);
                br = new BinaryWriter(fs);
                br.Write(data, 0, data.Length);
                br.Close();
                fs.Close();
            }
            catch
            {
                br.Close();
                fs.Close();
                return string.Empty;
            }
            return fileName;
        }

方式二：

   // <summary>
        /// 根据图片路径返回图片的字节流byte[]
        /// </summary>
        /// <param name="imagePath">图片路径</param>
        /// <returns>返回的字节流</returns>
        private byte[] ImageToByte(string imagePath)
        {
            FileStream files = new FileStream(imagePath, FileMode.Open);
            byte[] imgByte = new byte[files.Length];
            files.Read(imgByte, 0, imgByte.Length);
            files.Close();
            return imgByte;
        }

        /// <summary>
        /// 字节数组生成图片
        /// </summary>
        /// <param name="Bytes">字节数组</param>
        /// <returns>图片</returns>
        private Image ByteArrayToImage(byte[] Bytes)
        {
            MemoryStream ms = new MemoryStream(Bytes);
            return Bitmap.FromStream(ms, true);
        }

　　程序运行效果：

//将image转换成byte[]数据
private byte[] ImageToByte(System.Drawing.Image img)
{
    MemoryStream ms = new MemoryStream();
    img.Save(ms,System.Drawing.Imaging.ImageFormat.Jpeg);
    return  ms.ToArray();
}

//将byte[]数据转换成image
private Image ByteToImage(byte[]  bytes)
{
     MemoryStream ms = new MemoryStream(bytes);
     Image img= Image.FromStream(ms);
     return img;
}