将字节数组转换为图像但未显示

Question

我正在将从数据库检索到的字节数组转换为图像。它被转换 - 我认为 - 成功但不在图像框中显示图像。这是我正在实施的代码。如果有人帮忙，请。

protected async override void OnNavigatedTo(NavigationEventArgs e)
        {
            base.OnNavigatedTo(e);
            Service1Client GetNameFromService = new Service1Client();
            GetNameRequest NameRequest = new GetNameRequest();
            NameRequest.username = e.Parameter.ToString();
            GetNameResponse NameResponse = await GetNameFromService.GetNameAsync(NameRequest);
            lblName.Text = NameResponse.GetNameResult.NAME;
            byte[] IMG = NameResponse.GetNameResult.IMAGE;

            using (InMemoryRandomAccessStream raStream = new InMemoryRandomAccessStream())
            {

                using (DataWriter writer = new DataWriter(raStream))
                {
                    // Write the bytes to the stream
                    writer.WriteBytes(IMG);

                    // Store the bytes to the MemoryStream
                    await writer.StoreAsync();

                    // Not necessary, but do it anyway
                    await writer.FlushAsync();

                    // Detach from the Memory stream so we don't close it
                    writer.DetachStream();
                }

                raStream.Seek(0);

                BitmapImage bitMapImage = new BitmapImage();
                bitMapImage.SetSource(raStream);

                imgUser.Source = bitMapImage;
            }

            //var stream = new InMemoryRandomAccessStream();
            //await stream.WriteAsync(IMG.AsBuffer());

            //BitmapImage image = new BitmapImage();
            //image.SetSource(stream);
            //imgUser.Source = image;

            ID = NameResponse.GetNameResult.id;

            await GetNameFromService.CloseAsync();
        }`

通过网络服务检索图片。 Web服务方法的代码如下，

        public GetDetail GetDetail(string username)
    {
        StoryMakerConnection.Open();
        GetDetail GD = new GetDetail();
        SqlCommand GetIDCommand = new SqlCommand("SELECT UserId FROM LoginInfo WHERE UserName LIKE '" + username + "'", StoryMakerConnection);
        SqlDataReader IDReader = GetIDCommand.ExecuteReader();
        while (IDReader.Read())
        {
            GD.ID = Convert.ToInt16(IDReader["UserId"].ToString());
        }
        IDReader.Close();
        SqlCommand GetNameCommand = new SqlCommand("SELECT UserFirstName, UserLastName, Picture FROM UserInfo WHERE UserId = " + GD.ID, StoryMakerConnection);
        SqlDataReader NameReader = GetNameCommand.ExecuteReader();
        while (NameReader.Read())
        {
            GD.FullName = NameReader["UserFirstName"].ToString() + " " + NameReader["UserLastName"].ToString();
            GD.img = System.Text.Encoding.ASCII.GetBytes(NameReader["Picture"].ToString());
        }
        return GD;
    }