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), 380));

                    xdoubleAnimationUsingKeyFrames.KeyFrames.Add(CreateKeyFrame(KeyTime.FromTimeSpan(time.Add(TimeSpan.FromSeconds(0.3))), 0));

                    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))), 0));

                    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))), 0));

                    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;
        }