Why is my flipview not showing any pictures?

问题

Currently I am able to select multiple files but when I click open, the selected images are not being shown. Instead, "Windows.UI.XAML.Media.Imaging.BitmapImage" appears as a text. The FlipView functionality is still there though. What am I doing wrong?

XAML.

<FlipView x:Name="flpView" Grid.Row="1" Margin="10, 10, 10, 10">
    <Image x:Name="images" Stretch="UniformToFill" />
</FlipView>

Behind code.

public async Task flipviewload()
{
    // Add code to perform some action here.
    Windows.Storage.Pickers.FileOpenPicker openPicker = new Windows.Storage.Pickers.FileOpenPicker();
    openPicker.SuggestedStartLocation = Windows.Storage.Pickers.PickerLocationId.PicturesLibrary;
    openPicker.ViewMode = Windows.Storage.Pickers.PickerViewMode.Thumbnail;

    // Filter to include a sample subset of file types.
    openPicker.FileTypeFilter.Clear();
    openPicker.FileTypeFilter.Add(".bmp");
    openPicker.FileTypeFilter.Add(".png");
    openPicker.FileTypeFilter.Add(".jpeg");
    openPicker.FileTypeFilter.Add(".jpg");
    var files = await openPicker.PickMultipleFilesAsync();

    var images = new List<BitmapImage>();
    if (files != null)
    {
        //foreach (StorageFile Images in files)
        foreach (var file in files)
        {
            Windows.Storage.Streams.IRandomAccessStream fileStream = await file.OpenAsync(Windows.Storage.FileAccessMode.Read);
            using (Windows.Storage.Streams.IRandomAccessStream filestream = await file.OpenAsync(Windows.Storage.FileAccessMode.Read))
            {
                BitmapImage bitmapImage = new BitmapImage();
                await bitmapImage.SetSourceAsync(fileStream);
                //Images.Source = bitmapImage;
                images.Add(bitmapImage);
            }
        }
    }
    flpView.ItemsSource = images;
}

I also added Task foo = flipviewload(); in my public MainPage();

回答1:

You get this result because default rendering calls ToString() on the item, which prints the name of the class. If you want to display the image you have to supply an ItemTemplate:

<FlipView x:Name="flpView" Grid.Row="1" Margin="10, 10, 10, 10">
    <FlipView.ItemTemplate>
        <DataTemplate>
            <Image Stretch="UniformToFill" Source="{Binding}" />
        </DataTemplate>
    </FlipView.ItemTemplate>
</FlipView>

来源：https://stackoverflow.com/questions/19852459/why-is-my-flipview-not-showing-any-pictures

标签

xaml

windows-runtime

bitmapimage

flipview