将图像绑定到GridView Windows 8

这个问题在某些方面与这个问题类似：

Windows 8 XAML：通过数据绑定在GridView中显示图像列表

我遵循了其中列出的将图像加载到我自己的GridView中的说明，我从几个图像加载到了第一个图像加载，仅此而已；其余的甚至不会显示为空白，而之前如果没有完全加载，它们都会在那里。这是我的代码，它使用了与上述问题中相同的大部分内容：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Windows.Storage;
using Windows.UI.Xaml.Media.Imaging;
using Windows.Storage.Streams;
namespace present50_2
{
    public class SlideData
    {
        // slide collection that will be used to populate app slides page
        public List<Slide> Slides = new List<Slide>();
        // image files that will be asynchronously loaded
        public IReadOnlyList<StorageFile> files;
        public SlideData(IReadOnlyList<StorageFile> files)
        {
            this.files = files;
        }
        public async void loadSlides()
        {
            int counter = 1;
            Slides = new List<Slide>();
            foreach (var file in files)
            {
                using (var stream = await file.OpenAsync(FileAccessMode.Read))
                {
                    Slides.Add(new Slide(stream, counter.ToString()));
                }
                counter++;
            }
        }
        public class Slide
        {
            public Slide()
            {
            }
            public Slide(IRandomAccessStream stream, string name)
            {
                BitmapImage bmp = new BitmapImage();
                bmp.SetSource(stream);
                Image = bmp;
                this.Title = name;
            }
            /*
            public async void LoadImage()
            {
                IRandomAccessStream fileStream = await file.OpenAsync(Windows.Storage.FileAccessMode.Read);
                BitmapImage bi = new BitmapImage();
                bi.SetSource(fileStream);
                this.Image = bi;
            } */
            public string Title { set; get; }
            public BitmapImage Image { set; get; }
        }
    }
}

该类保存将绑定到网格的数据。这是调用所述类的代码：

protected async override void LoadState(Object navigationParameter, Dictionary<String, Object> pageState)
        {
            var folderPicker = new FolderPicker();
            folderPicker.SuggestedStartLocation = PickerLocationId.DocumentsLibrary;
            folderPicker.FileTypeFilter.Add(".png");
            StorageFolder folder = await folderPicker.PickSingleFolderAsync();
            if (folder != null)
            {
                IReadOnlyList<StorageFile> files = await folder.GetFilesAsync();
                SlideData slides = new SlideData(files);
                slides.loadSlides();
                this.DefaultViewModel["Items"] = slides.Slides;
            }
        }

我只使用以下XAML进行实际的网格布局和绑定：

<!-- Grid-appropriate 125 pixel square item template as seen in the GroupedItemsPage and ItemsPage -->
    <DataTemplate x:Key="Standard125x125ItemTemplate">
        <Grid HorizontalAlignment="Left" Width="125" Height="125">
            <Border Background="{StaticResource ListViewItemPlaceholderBackgroundThemeBrush}">
                <Image Source="{Binding Image}" Stretch="UniformToFill" AutomationProperties.Name="{Binding Title}"/>
            </Border>
            <StackPanel VerticalAlignment="Bottom" Background="{StaticResource ListViewItemOverlayBackgroundThemeBrush}">
                <TextBlock Text="{Binding Title}" Foreground="{StaticResource ListViewItemOverlayForegroundThemeBrush}" Style="{StaticResource TitleTextStyle}" Height="30" Margin="7,0,7,0"/>
            </StackPanel>
        </Grid>
    </DataTemplate>

该代码只是StandardStyles.xaml.中250x250模板的修改

起初，我根本无法在屏幕上加载任何图像（它们只是显示为灰色方块）。然后，通过我在这里看到的一个实现（Kiwi示例），我能够加载一些图像，但大多数图像仍然保持灰色：

http://social.msdn.microsoft.com/Forums/windowsapps/en-US/252d4d14-1db3-4f04-93b6-d2eab2c386bc/c-metro-displaying-images-in-a-listview-or-gridview

然后，使用我在上面发布的最后一个解决方案，我只看到了第一张幻灯片，但其他幻灯片都没有显示为灰色框，更不用说加载了。非常感谢您的帮助！

slides.loadSlides();

this.DefaultViewModel["Items"] = slides.Slides;
...

public async Task loadSlides() { ... }

...
SlideData slides = new SlideData(files);
await slides.loadSlides();
this.DefaultViewModel["Items"] = slides.Slides;
...