winrt 页面进入动画

private async void DoAnimistion()
{
Storyboard storyboard = new Storyboard();
            using (IEnumerator<DependencyObject> enumerator = stack.Children.ToList().GetEnumerator())
　　　　　　//此处的stack是一个StackPanel，我要对它的子元素做动画   
         {
                Random random = new Random();
                TimeSpan time = TimeSpan.FromSeconds(0.0);
                var ts = TimeSpan.FromMilliseconds(80.0);
                double angle = -120.0;
                while (enumerator.MoveNext())
                {

                    //double num = random.Next(200, 500);

                    FrameworkElement frameworkElement = (FrameworkElement)enumerator.Current;

                    DoubleAnimationUsingKeyFrames xdoubleAnimationUsingKeyFrames = new DoubleAnimationUsingKeyFrames();
                    xdoubleAnimationUsingKeyFrames.KeyFrames.Add(CreateKeyFrame(KeyTime.FromTimeSpan(time), ));
                    xdoubleAnimationUsingKeyFrames.KeyFrames.Add(CreateKeyFrame(KeyTime.FromTimeSpan(time.Add(TimeSpan.FromSeconds(0.3))), ));
                    Storyboard.SetTarget(xdoubleAnimationUsingKeyFrames, frameworkElement);
                    Storyboard.SetTargetName(xdoubleAnimationUsingKeyFrames, frameworkElement.Name);
                    Storyboard.SetTargetProperty(xdoubleAnimationUsingKeyFrames, TargetProperty.RenderTransformTranslateX);
                    storyboard.Children.Add(xdoubleAnimationUsingKeyFrames);

                    DoubleAnimationUsingKeyFrames ydoubleAnimationUsingKeyFrames = new DoubleAnimationUsingKeyFrames();
                    ydoubleAnimationUsingKeyFrames.KeyFrames.Add(CreateKeyFrame(KeyTime.FromTimeSpan(time), angle));
                    ydoubleAnimationUsingKeyFrames.KeyFrames.Add(CreateKeyFrame(KeyTime.FromTimeSpan(time.Add(TimeSpan.FromSeconds(0.3))), ));
                    Storyboard.SetTarget(ydoubleAnimationUsingKeyFrames, frameworkElement);
                    Storyboard.SetTargetName(ydoubleAnimationUsingKeyFrames, frameworkElement.Name);
                    Storyboard.SetTargetProperty(ydoubleAnimationUsingKeyFrames, TargetProperty.ProjectionRotationY);
                    storyboard.Children.Add(ydoubleAnimationUsingKeyFrames);

                    var num3 = -1.0 * (Math.Tan(DegreesToRadians(angle)) * frameworkElement.ActualWidth);
                    num3 += frameworkElement.ActualWidth;
                    DoubleAnimationUsingKeyFrames zdoubleAnimationUsingKeyFrames = new DoubleAnimationUsingKeyFrames();
                    zdoubleAnimationUsingKeyFrames.KeyFrames.Add(CreateKeyFrame(KeyTime.FromTimeSpan(time), num3));
                    zdoubleAnimationUsingKeyFrames.KeyFrames.Add(CreateKeyFrame(KeyTime.FromTimeSpan(time.Add(TimeSpan.FromSeconds(0.3))), ));
                    Storyboard.SetTarget(zdoubleAnimationUsingKeyFrames, frameworkElement);
                    Storyboard.SetTargetName(zdoubleAnimationUsingKeyFrames, frameworkElement.Name);
                    Storyboard.SetTargetProperty(zdoubleAnimationUsingKeyFrames, TargetProperty.ProjectionGlobalOffsetZ);
                    storyboard.Children.Add(zdoubleAnimationUsingKeyFrames);

                    time = time.Add(ts);
                }
            }
            storyboard.Begin();
}
public static double DegreesToRadians(double degrees)
        {
            return degrees * 2.0 * 3.1415926535897931 / 360.0;
        }