protected void Button1_Click(object sender, EventArgs e){  //圖片轉二進制  byte[] imageByte = GetPictureData(Server.MapPath("./uploadfile/111.png"));  //二進制轉換成字符串  string picStr = Convert.ToBase64String(imageByte);  //輸出字符串  Response.Write(picStr);  //字符串轉二進制  byte[] imageBytes = Convert.FromBase64String(picStr);  //讀入MemoryStream對象  MemoryStream memoryStream = new MemoryStream(imageBytes, 0, imageBytes.Length);  memoryStream.Write(imageBytes, 0, imageBytes.Length);  //二進制轉成圖片保存  System.Drawing.Image image = System.Drawing.Image.FromStream(memoryStream);  image.Save(Server.MapPath("./uploadfile/222.png"));}/// <summary>/// 二進制流轉圖片/// </summary>/// <param name="streamByte">二進制流</param>/// <returns>圖片</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>/// 圖片轉二進制/// </summary>/// <param name="imagepath">圖片地址</param>/// <returns>二進制</returns>public byte[] GetPictureData(string imagepath){  //根據圖片文件的路徑使用文件流打開，并保存為byte[]  FileStream fs = new FileStream(imagepath, FileMode.Open);//可以是其他重載方法  byte[] byData = new byte[fs.Length];  fs.Read(byData, 0, byData.Length);  fs.Close();  return byData;}/// <summary>/// 圖片轉二進制/// </summary>/// <param name="imgPhoto">圖片對象</param>/// <returns>二進制</returns>public byte[] PhotoImageInsert(System.Drawing.Image imgPhoto){  //將Image轉換成流數據，并保存為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;}