C#读二进制流生成图像

  String sql;
            string accessoriesId;
            //MySqlCommand cmdnew = new MySqlCommand();
            //cmdnew = myBeans.getCmd();
            accessoriesId = dataGridView1.CurrentRow.Cells[6].Value.ToString().Trim();//获取accessories表中的id(即：dataGridView_add隐藏的第列).
            sql = "select content from tbl_accessories where id = '" + accessoriesId + "'";//根据tbl_accessories表中的ID选择

            //cmd.CommandText = sql;
            //取数据库中的比特流到buffByte数组
            MySqlDataReader reader = myBeans.getCom(sql);
            
            string fileExtension, strFileNamed;//扩展名、文件名
            byte[] buffByte = null;
            while (reader.Read())
            {
                buffByte = ((byte[])reader[0]);
            }
            reader.Close();
            strFileNamed = dataGridView1.CurrentCell.Value.ToString().Trim();//获取当前选择的Cell中的内容(即文件名)
            //截取字符串后缀和长度
            String picture = "";
            string[] word = strFileNamed.Split(new char[] { '.' });
            foreach (string temp in word)
            {
                picture = temp;
            }
            int num1 = picture.Length;
            if(num1==3){
                
                fileExtension = strFileNamed.Substring(strFileNamed.Length - 4);