protected void Button1_Click(object sender, EventArgs e)        {            //图片转二进制            byte[] imageByte = GetPictureData(Server.MapPath("./uploadfile/111.png"));            //二进制转换成字符串            string picStr = Convert.ToBase64String(imageByte);            //输出字符串            Response.Write(picStr);            //字符串转二进制            byte[] imageBytes = Convert.FromBase64String(picStr);            //读入MemoryStream对象            MemoryStream memoryStream = new MemoryStream(imageBytes, 0, imageBytes.Length);            memoryStream.Write(imageBytes, 0, imageBytes.Length);            //二进制转成图片保存            System.Drawing.Image image = System.Drawing.Image.FromStream(memoryStream);            image.Save(Server.MapPath("./uploadfile/222.png"));        }                /// <summary>        /// 二进制流转图片        /// </summary>        /// <param name="streamByte">二进制流</param>        /// <returns>图片</returns>        public System.Drawing.Image ReturnPhoto(byte[] streamByte)        {            System.IO.MemoryStream ms = new System.IO.MemoryStream(streamByte);            System.Drawing.Image img = System.Drawing.Image.FromStream(ms);            return img;        }                /// <summary>        /// 图片转二进制        /// </summary>        /// <param name="imagepath">图片地址</param>        /// <returns>二进制</returns>        public byte[] GetPictureData(string imagepath)        {            //根据图片文件的路径使用文件流打开，并保存为byte[]             FileStream fs = new FileStream(imagepath, FileMode.Open);//可以是其他重载方法             byte[] byData = new byte[fs.Length];            fs.Read(byData, 0, byData.Length);            fs.Close();            return byData;        }                /// <summary>        /// 图片转二进制        /// </summary>        /// <param name="imgPhoto">图片对象</param>        /// <returns>二进制</returns>        public byte[] PhotoImageInsert(System.Drawing.Image imgPhoto)        {            //将Image转换成流数据，并保存为byte[]             MemoryStream mstream = new MemoryStream();            imgPhoto.Save(mstream, System.Drawing.Imaging.ImageFormat.Bmp);            byte[] byData = new Byte[mstream.Length];            mstream.Position = 0;            mstream.Read(byData, 0, byData.Length);            mstream.Close();            return byData;        }