Develop Reference

Trouble Creating a Double Animation

I am creating a flashing animation for a Text Block in WPF in the code behind. I know that the text block as the opacity property, yet this code cannot seem to find it. What am I doing wrong?
DoubleAnimation da = new DoubleAnimation
{
From = 1,
To = 0,
Duration = new Duration(TimeSpan.FromSeconds(0.5)),
AutoReverse = true,
RepeatBehavior = RepeatBehavior.Forever
};
myTextBlock.BeginAnimation(Opacity, da);
In addition, I am trying to create a color animation. That doesn't seem to be working either:
ColorAnimation ca = new ColorAnimation
{
From = Colors.Red,
To = Colors.Black,
Duration = new Duration(TimeSpan.FromSeconds(1)),
AutoReverse = true,
RepeatBehavior = RepeatBehavior.Forever
};
myTextBlock.Background.BeginAnimation(SolidColorBrush.ColorProperty, ca);

Animation is applied to Property, not to Field. Also it seem you use parent's Opacity, not the TextBlock.
Change Opacity to UIElement.OpacityProperty:
DoubleAnimation da = new DoubleAnimation
{
From = 1,
To = 0,
Duration = new Duration(TimeSpan.FromSeconds(0.5)),
AutoReverse = true,
RepeatBehavior = RepeatBehavior.Forever
};
myTextBlock.BeginAnimation(UIElement.OpacityProperty, da);

Storyboard sboard = new Storyboard();
DoubleAnimation da = new DoubleAnimation
{
From = 1,
To = 0,
AutoReverse = true,
RepeatBehavior = RepeatBehavior.Forever
};
Storyboard.SetTarget(da, urButton);
Storyboard.SetTargetProperty(animation, new PropertyPath((object)UIElement.OpacityProperty));
sboard.Children.Add(animation);
sboard.Start()

Your code works for me. Did you set the background color to red, first? If not try setting the background color to red.

Animating drop shadow fade-in/fade-out with a storyboard

I'd like to fade in a drop shadow effect on a DataGrid over 2 seconds, which fades out over 2 seconds again after the fade-in animation is completed.
My code so far:
DropShadowEffect dropShadowEffect = new DropShadowEffect();
dropShadowEffect.ShadowDepth = 0;
dropShadowEffect.Color = Colors.LightSeaGreen;
dropShadowEffect.Opacity = 0;
dropShadowEffect.BlurRadius = 20;
element.Effect = dropShadowEffect;
Storyboard storyboard1 = new Storyboard();
TimeSpan duration1 = TimeSpan.FromMilliseconds(2000);
DoubleAnimation animateOpacity1 = new DoubleAnimation() { From = 0, To = 1, Duration = new Duration(duration1) };
Storyboard.SetTargetName(animateOpacity1, element.Name);
Storyboard.SetTargetProperty(animateOpacity1, new PropertyPath(DropShadowEffect.OpacityProperty));
DoubleAnimation animateOpacity2 = new DoubleAnimation() { From = 1, To = 0, Duration = new Duration(duration1) };
Storyboard.SetTargetName(animateOpacity2, element.Name);
Storyboard.SetTargetProperty(animateOpacity2, new PropertyPath(DropShadowEffect.OpacityProperty));
storyboard1.Children.Add(animateOpacity1);
storyboard1.Children.Add(animateOpacity2);
storyboard1.Begin(element);
Upon executing the code, nothing happens.

If you simply want to do DoubleAnimation, no need to complex it using StoryBoard. Also, you can achieve this with only single double animation with property AutoReverse set to true.
Moreover, do animation on dropShadowEffect object instead of element object.
TimeSpan duration = TimeSpan.FromMilliseconds(2000);
DoubleAnimation animateOpacity = new DoubleAnimation() { From = 0, To = 1,
Duration = duration, AutoReverse = true };
dropShadowEffect.BeginAnimation(DropShadowEffect.OpacityProperty,
animateOpacity);

ScaleY animation in WPF

Why below code doesn't change ScaleY to 1?
var transform = new ScaleTransform { ScaleY = 0 };
var story = new Storyboard();
var animation = new DoubleAnimation {
Duration = new Duration(new TimeSpan(0)), To = 1 };
Storyboard.SetTarget(animation, transform);
Storyboard.SetTargetProperty(animation, new PropertyPath("ScaleY"));
story.Children.Add(animation);
story.Begin();
I use transform indirectly: it use for render some UIElements and kept in their DependencyProperty.

Does it perhaps work if you drop the Storyboard and just call BeginAnimation directly?
var transform = new ScaleTransform { ScaleY = 0 };
var animation = new DoubleAnimation { Duration = TimeSpan.Zero, To = 1 };
transform.BeginAnimation(ScaleTransform.ScalyYProperty, animation);
Note that this will only have any effect if the animation's FillBehavior has a value of HoldEnd. Otherwise the animated property will immediately revert back to its local value (which is 0 here). Fortunately HoldEnd is the default value for FillBehavior.
And of course the transform should be used somewhere.

How can I animate the Margin of a Stackpanel with a storyboard?

I would like to use it, but it doesnt't work, I wanna create a tile animation, in code behind, or if you know a project for this gol, pls write me
Deployment.Current.Dispatcher.BeginInvoke(() =>
{
while(true){
Duration duration = new Duration(TimeSpan.FromSeconds(0.15));
// Create two DoubleAnimations and set their properties.
DoubleAnimation myDoubleAnimation1 = new DoubleAnimation();
myDoubleAnimation1.Duration = duration;
myDoubleAnimation1.From = -173
myDoubleAnimation1.To = 173;
Storyboard sb = new Storyboard();
sb.Duration = duration;
sb.Children.Add(myDoubleAnimation1);
Storyboard.SetTarget(myDoubleAnimation1, image);
// Set the attached properties of Canvas.Left and Canvas.Top
// to be the target properties of the two respective DoubleAnimations.
Storyboard.SetTargetProperty(myDoubleAnimation1, new PropertyPath(StackPanel.MarginProperty));
// Begin the animation.
sb.Begin();}
});

Here is the working example, if anybody needs:
//Animate margin for Label, named "label" from right to left. from 300 to 0.
var sb = new Storyboard();
var ta = new ThicknessAnimation();
ta.BeginTime = new TimeSpan(0);
ta.SetValue(Storyboard.TargetNameProperty, "label");
Storyboard.SetTargetProperty(ta, new PropertyPath(MarginProperty));
ta.From = new Thickness(300, 30, 0, 0);
ta.To = new Thickness(0, 30, 0, 0);
ta.Duration = new Duration(TimeSpan.FromSeconds(3));
sb.Children.Add(ta);
sb.Begin(this);

Use a ThicknessAnimation instead of a DoubleAnimation. It's almost the same.
Edit:
If you want to make the Animation endless use Timeline.RepeatBehavior.
myThicknessAnimation1.RepeatBehavior = RepeatBehavior.Forever;

Windows 8 - BeginAnimation?

It seems I can't do myObject.BeginAnimation(dp , animation).
Is this a bug or has it been changed?

You need to use a storyboard. Add your animation to the storyboard and have the storyboard begin the animation.
var storyboard = new Storyboard();
var opacityAnimation = new DoubleAnimation {
From = 0,
To = 1,
Duration = DurationHelper.FromTimeSpan(TimeSpan.FromSeconds(1)),
};
storyboard.Children.Add(opacityAnimation);
Storyboard.SetTargetProperty(opacityAnimation, "Opacity");
Storyboard.SetTarget(storyboard, myObject);
storyboard.Begin();