从数据库中读取二进制数据，并显示图片

region 读取数据库中图片到内存.并显示
        public void LoadToMemoryAndDisable(string serverAdress, string database)
        {
            //读取数据库中图片到内存.并显示
            SqlConnection conn = new SqlConnection("server=" + serverAdress + ";integrated security = sspi;database = " + database);
            SqlCommand cmd = new SqlCommand("select * from imgtable where imgname like '%bmp%'", conn);
            conn.Open();
            SqlDataReader dr;
            try
            {
                dr = cmd.ExecuteReader();
                dr.Read();
                System.Data.SqlTypes.SqlBinary sb = dr.GetSqlBinary(2);
                //或byte[] imageData = (byte[])dr[2];
                MemoryStream ms = new MemoryStream(sb.Value);//在内存中操作图片数据
                Bitmap bmp = new Bitmap(Bitmap.FromStream(ms));
                this.pictureBox1.Image = bmp;
                dr.Close();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
            finally
            {
                conn.Close();
            }
        }
        #endregion