c# - 在 Windows Phone 8.1 中使用文件选择器选择的图像

Question

我想在 Windows Phone 8.1 中使用文件选择器选择的图像。我使用此代码选择了图像

  private async void gallery_Tapped(object sender, TappedRoutedEventArgs e)
    {
        FileOpenPicker openPicker = new FileOpenPicker();
        openPicker.ViewMode = PickerViewMode.Thumbnail;
        openPicker.SuggestedStartLocation = PickerLocationId.PicturesLibrary;
        openPicker.FileTypeFilter.Add(".jpg");
        openPicker.FileTypeFilter.Add(".jpeg");
        openPicker.FileTypeFilter.Add(".png");

        // Launch file open picker and caller app is suspended and may be terminated if required
        openPicker.PickSingleFileAndContinue();
   }


 public async void ContinueFileOpenPicker(FileOpenPickerContinuationEventArgs args)
        {
            if (args.Files.Count > 0)
            {
                StorageFile file=args.Files[0];

                IRandomAccessStream fileStream = await                     file.OpenAsync(Windows.Storage.FileAccessMode.Read);
                BitmapImage bitmapImage = new BitmapImage();

                bitmapImage.SetSource(fileStream);
                MyImage.Source=bitmapImage;

  }
            else
            {

            }
}

ContinueFileOpenPicker 未执行 我试过了 this但无法理解。这里有任何人可以逐步指导我我应该怎么做才能让它发挥作用。谢谢

Answer 1

 protected override void OnActivated(IActivatedEventArgs args)
        {
            var root = Window.Current.Content as Frame;
            var mainPage = root.Content as MainPage;
            if (mainPage != null && args is FileOpenPickerContinuationEventArgs)
            {
                mainPage.ContinueFileOpenPicker(args as FileOpenPickerContinuationEventArgs);
            }
        }

将这段代码放在 app.xaml.cs 中它会起作用..