<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
    <Grid.Resources>
        <Storyboard x:Name="storyboard">
            <PointAnimationUsingKeyFrames Storyboard.TargetName="myLinearGradientBrush" 
                                Storyboard.TargetProperty="StartPoint"  EnableDependentAnimation="True"
                                RepeatBehavior="Forever" >
                <DiscretePointKeyFrame Value="0.1,0.3" KeyTime="0:0:0"/>
                <DiscretePointKeyFrame Value="0.2,0.4" KeyTime="0:0:1"/>
                <DiscretePointKeyFrame Value="0.3,0.5" KeyTime="0:0:2"/>
                <DiscretePointKeyFrame Value="0.4,0.6" KeyTime="0:0:3"/>
                <DiscretePointKeyFrame Value="0.5,0.7" KeyTime="0:0:4"/>
                <DiscretePointKeyFrame Value="0.6,0.8" KeyTime="0:0:5"/>
                <DiscretePointKeyFrame Value="0.7,0.9" KeyTime="0:0:6"/>
            </PointAnimationUsingKeyFrames>
        </Storyboard>
    </Grid.Resources>
    <Grid.RowDefinitions>
        <RowDefinition Height="Auto"/>
        <RowDefinition Height="*"/>
    </Grid.RowDefinitions>

    <StackPanel x:Name="TitlePanel" Grid.Row="0" Margin="12,35,0,28">
        <TextBlock Text="我的应用程序" FontSize="20"  />
        <TextBlock Text="动画" FontSize="60" />
    </StackPanel>

    <Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">
        <Ellipse x:Name="ellipse" >
            <Ellipse.Fill>
                <LinearGradientBrush  x:Name="myLinearGradientBrush"
                                     StartPoint="0,0" EndPoint="1,0">
                    <LinearGradientBrush.GradientStops>
                        <GradientStop Color="White" Offset="0.001"></GradientStop>
                        <GradientStop Color="Blue" Offset="1"></GradientStop>
                    </LinearGradientBrush.GradientStops>
                </LinearGradientBrush >
            </Ellipse.Fill>
        </Ellipse>
        <Button Content="启动动画" Height="100" Click="Button_Click_1"></Button>
    </Grid>
</Grid>

private void Button_Click_1(object sender, RoutedEventArgs e) {
    storyboard.Begin();
}

<Page.Resources>
    <Storyboard RepeatBehavior="Forever" x:Name="Bounce">
        <DoubleAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetName="ball" Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[0].(TranslateTransform.X)">
            <SplineDoubleKeyFrame KeyTime="00:00:00" Value="0"/>
            <SplineDoubleKeyFrame KeyTime="00:00:04" Value="297"/>
            <SplineDoubleKeyFrame KeyTime="00:00:06" Value="320"/>
        </DoubleAnimationUsingKeyFrames>
        <DoubleAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetName="ball" Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[0].(TranslateTransform.Y)">
            <SplineDoubleKeyFrame KeyTime="00:00:00" Value="0"/>
            <SplineDoubleKeyFrame KeyTime="00:00:02" Value="-206">
                <SplineDoubleKeyFrame.KeySpline>
                    <KeySpline ControlPoint1="0,1" ControlPoint2="1,1"/>
                </SplineDoubleKeyFrame.KeySpline>
            </SplineDoubleKeyFrame>
            <SplineDoubleKeyFrame KeyTime="00:00:04" Value="0">
                <SplineDoubleKeyFrame.KeySpline>
                    <KeySpline ControlPoint1="1,0" ControlPoint2="1,1"/>
                </SplineDoubleKeyFrame.KeySpline>
            </SplineDoubleKeyFrame>
            <SplineDoubleKeyFrame KeyTime="00:00:05" Value="-20">
                <SplineDoubleKeyFrame.KeySpline>
                    <KeySpline ControlPoint1="0,1" ControlPoint2="1,1"/>
                </SplineDoubleKeyFrame.KeySpline>
            </SplineDoubleKeyFrame>
            <SplineDoubleKeyFrame KeyTime="00:00:06" Value="0">
                <SplineDoubleKeyFrame.KeySpline>
                    <KeySpline ControlPoint1="1,0" ControlPoint2="1,1"/>
                </SplineDoubleKeyFrame.KeySpline>
            </SplineDoubleKeyFrame>
        </DoubleAnimationUsingKeyFrames>
    </Storyboard>
</Page.Resources>
<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
    <Grid.RowDefinitions>
        <RowDefinition Height="Auto"/>
        <RowDefinition Height="*"/>
    </Grid.RowDefinitions>

    <StackPanel x:Name="TitlePanel" Grid.Row="0" Margin="12,35,0,28">
        <TextBlock Text="我的应用程序" FontSize="20"  />
        <TextBlock Text="BouncingBall" FontSize="60" />
    </StackPanel>

    <Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">
        <Ellipse Height="85" HorizontalAlignment="Left" Margin="71,0,0,151" VerticalAlignment="Bottom" Width="93" Fill="#FFF40B0B" Stroke="#FF000000" x:Name="ball" RenderTransformOrigin="0.5,0.5">
            <Ellipse.RenderTransform>
                <TransformGroup>
                    <TranslateTransform/>
                </TransformGroup>
            </Ellipse.RenderTransform>
        </Ellipse>
    </Grid>
</Grid>

public sealed partial class MainPage: Page {
    public MainPage() {
        this.InitializeComponent();
        //开始运行Storyboard
        Bounce.Begin();
    }

    protected override void OnNavigatedTo(NavigationEventArgs e) {}
}

<Button Content="会旋转的按钮" Grid.Row="0" HorizontalAlignment="Center" VerticalAlignment="Center"                   
                    RenderTransformOrigin="0.5 0.5" Background="Blue" Click="OnButtonClick">
    <Button.RenderTransform>
        <RotateTransform />
    </Button.RenderTransform>
</Button>

private void OnButtonClick(object sender, RoutedEventArgs args) {
    Button btn = sender as Button;
    RotateTransform rotateTransform = btn.RenderTransform as RotateTransform;
    DoubleAnimation anima = new DoubleAnimation();
    anima.From = 0;
    anima.To = 360;
    anima.Duration = new Duration(TimeSpan.FromSeconds(0.5));
    Storyboard.SetTarget(anima, rotateTransform);
    Storyboard.SetTargetProperty(anima, "Angle");
    Storyboard storyboard = new Storyboard();
    storyboard.Children.Add(anima);
    storyboard.Begin();
}