从数据库到BitmapImageSource的Byte []-一个接一个的错误

Question

我正在为我工​​作的公司创建UWP应用，其中一部分工作是上载证件照片。当用户单击以上传选择器时，将显示选择器，它将图像加载到图像元素。这可以正常工作，问题是当提取具有附加照片的现有记录时。该文件存储为byte []，我在.Net Web应用程序上使用的代码在这里不起作用。即使在无数网站上逐个阅读一周后，我也无法正常工作。

using (SqlDataReader reader = cmd.ExecuteReader())
                            {
                                while (reader.Read())
                                {
                                    photo.ID = reader.GetGuid(0);
                                    photo.AttachmentType = reader.GetString(1);
                                    photo.AttachmentSize = reader.GetInt32(2);
                                    photo.Attachment = (byte[])reader.GetValue(3);
                                }
                            }
                            RemoveBtn.Visibility = Visibility.Visible;

                        }
                    }
                }
            }
        }
        catch (Exception eSql)
        {
            var err = eSql.Message.ToString();
        }

        if (photo.Attachment != null && photo.Attachment.Length > 0)
        {
            //StorageFolder folder = Windows.ApplicationModel.Package.Current.InstalledLocation;
            //StorageFile file = await folder.CreateFileAsync($"tempImg{photo.AttachmentType}");
            //string path = @"D:\DOT2";
            //string fileName = "tempImg.png";
            //string pathStr = Path.Combine(path, fileName);

            using (Stream stream = new MemoryStream())
            {
                await stream.WriteAsync(photo.Attachment, 0, photo.Attachment.Length);

                using (IRandomAccessStream fileStream = stream.AsRandomAccessStream())
                {

                    BitmapImage img = new BitmapImage();
                    await img.SetSourceAsync(fileStream); //Error Occurs here.
                    CIPhoto.Source = img;
                }

            }

            UploadBtn.Visibility = Visibility.Collapsed;
            RemoveBtn.Visibility = Visibility.Visible;
        }

预期结果是将byte []转换为可以设置为Image UI元素的BitmapImageSource。我遇到一个又一个错误，当前我收到一条错误消息：“试图读取或写入受保护的内存。这通常表明其他内存已损坏。评论部分告诉我，我被拒绝访问。我被卡住了，请帮忙。