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Handling Failure and Down-level

  • [アーティクル]

The AnimatedVisualPlayer has a FallbackContent property that allows you to provide custom XAML to be displayed in cases where Lottie-Windows is unable to render the animation, such as:

  • a Lottie source that fails to load due to a malformed JSON file, incorrect URI, etc.
  • your application running on a Windows 10 OS version prior to 1809 (10.0.17763).

The FallbackContent is of type DataTemplate — this ensures that your custom XAML tree is only instantiated when the AnimatedVisualPlayer needs to fallback. In the example below, we use an Image as fallback for the Lottie animation:

    <!-- AnimatedVisualPlayer -->
    <controls:AnimatedVisualPlayer x:Name="player">
        <!-- LottieVisualSource with invalid UriSource to cause fallback -->
        <lottie:LottieVisualSource x:Name="JsonSource "
                                    UriSource="https://notarealuri.microsoft.com/notarealfile.json" />
        <!-- Fallback Content: Custom XAML content that is rendered if Source fails to load, or if app runs on Windows 10 verion < 1809. -->
        <controls:AnimatedVisualPlayer.FallbackContent>
            <DataTemplate>
                <!-- Static Image for Fallback.
                     Because this is in a DataTemplate, the Image is only instantiated when in the fallback case. -->
                <Image Source="/Assets/LottieLogo1.png" />
            </DataTemplate>
        </controls:AnimatedVisualPlayer.FallbackContent>
    </controls:AnimatedVisualPlayer>

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