加载图像时隐藏WP7进度栏

Question

I'm using a progress bar for loading an image in an application for Windows Phone 7.

bitmapImage.DownloadProgress += new EventHandler<DownloadProgressEventArgs (bitmapImage_DownloadProgress);

void bitmapImage_DownloadProgress(object sender, DownloadProgressEventArgs e)
{
   progressBar.Value = e.Progress;
}

XAML file:

<ProgressBar x:Name="progressBar" IsIndeterminate="True" Width="300" Height="30" Style="{StaticResource PerformanceProgressBar}" />

I'd like to know the best way to make the progress bar disappear once the image is loaded.

Answer 1

Use the events ImageOpened which triggers when image has been loaded successfully and ImageFailed which triggers if image failed to download.

bitmapImage.ImageOpened += new EventHandler<RoutedEventArgs>(bi_ImageOpened);
bitmapImage.ImageFailed += new EventHandler<ExceptionRoutedEventArgs>(bi_ImageFailed);

void bi_ImageFailed(object sender, ExceptionRoutedEventArgs e)
{
    MessageBox.Show("Download of image failed");
    progressBar.Visibility = Visibility.Collapsed;
}

void bi_ImageOpened(object sender, RoutedEventArgs e)
{
     progressBar.Visibility = Visibility.Collapsed;
}

Answer 2

只需通过“ Visibility属性将其隐藏

progressBar.Visibility = Visibility.Collapsed