private string sqlconnstr = "Data Source=.;Database=db_test;User id=sa;PWD=123456";/*功能：把一種圖片插入到數據庫中 *返回值：無 */void InsertImageToDB(){  //將需要存儲的圖片讀取為數據流  FileStream fs = new FileStream(@"D:/Bear.jpg", FileMode.Open, FileAccess.Read);  Byte[] byte_fs = new byte[fs.Length];  fs.Read(byte_fs, 0, Convert.ToInt32(fs.Length));  fs.Close();  //建立數據庫連接  SqlConnection conn = new SqlConnection(sqlconnstr);  conn.Open();  SqlCommand cmd = new SqlCommand();  cmd.Connection = conn;  cmd.CommandText = "insert into tb_test(image_id,image_file) values(@image_id,@image_file)";  SqlParameter[] param = new SqlParameter[2];  param[0] = new SqlParameter("@image_id", SqlDbType.Int);  param[0].Value = 1;  param[1] = new sqlParameter("@image_file", SqlDbType.Image);  param[1].Value = byte_fs;  for (int index = 0; index < 2; index++)  { cmd.Parameters.Add(param[i]);  }  //執行SQL語句  cmd.ExecuteNonQuery();  conn.Close();}/*功能：從數據庫中讀取圖像文件，并顯示在PictureBox控件中 *返回值：無 */void GetImageFromDB(){  byte[] Data = new byte[0];  //建立數據庫連接  SqlConnection conn = new SqlConnection(sqlconnstr);  conn.Open();  SqlCommand cmd = new SqlCommand();  cmd.Connection = conn;  cmd.CommandText = "select * from tb_parent";  SqlDataReader sdr = cmd.ExecuteReader();  sdr.Read();  Data = (byte[])sdr["parent_image"];//讀取第一個圖片的位流  MemoryStream mystream = new MemoryStream(Data);  //用指定的數據流來創建一個image圖片  System.Drawing.Image picbImage = System.Drawing.Image.FromStream(mystream, true);  mystream.Close();  picturebox1.Image = picbImage;  conn.Close();}