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.NET Framework Class Library
Timeline Class

Defines a segment of time.

Namespace:   System.Windows.Media.Animation
Assembly:  PresentationCore (in PresentationCore.dll)
Syntax
<[%$TOPIC/ms634765_en-us_VS_110_2_0_0_0_0%]("Name")> _
<[%$TOPIC/ms634765_en-us_VS_110_2_0_0_0_1%]([%$TOPIC/ms634765_en-us_VS_110_2_0_0_0_2%].None, Readability := [%$TOPIC/ms634765_en-us_VS_110_2_0_0_0_3%].Unreadable)> _
Public MustInherit Class Timeline _
	Inherits [%$TOPIC/ms634765_en-us_VS_110_2_0_0_0_4%]
[[%$TOPIC/ms634765_en-us_VS_110_2_0_1_0_0%]("Name")]
[[%$TOPIC/ms634765_en-us_VS_110_2_0_1_0_1%]([%$TOPIC/ms634765_en-us_VS_110_2_0_1_0_2%].None, Readability = [%$TOPIC/ms634765_en-us_VS_110_2_0_1_0_3%].Unreadable)]
public abstract class Timeline : [%$TOPIC/ms634765_en-us_VS_110_2_0_1_0_4%]
[[%$TOPIC/ms634765_en-us_VS_110_2_0_2_0_0%](L"Name")]
[[%$TOPIC/ms634765_en-us_VS_110_2_0_2_0_1%]([%$TOPIC/ms634765_en-us_VS_110_2_0_2_0_2%]::None, Readability = [%$TOPIC/ms634765_en-us_VS_110_2_0_2_0_3%]::Unreadable)]
public ref class Timeline abstract : public [%$TOPIC/ms634765_en-us_VS_110_2_0_2_0_4%]
[<[%$TOPIC/ms634765_en-us_VS_110_2_0_3_0_0%]>]
[<[%$TOPIC/ms634765_en-us_VS_110_2_0_3_0_1%]("Name")>]
[<[%$TOPIC/ms634765_en-us_VS_110_2_0_3_0_2%]([%$TOPIC/ms634765_en-us_VS_110_2_0_3_0_3%].None, Readability = [%$TOPIC/ms634765_en-us_VS_110_2_0_3_0_4%].Unreadable)>]
type Timeline =  
    class 
        inherit [%$TOPIC/ms634765_en-us_VS_110_2_0_3_0_5%] 
    end

The Timeline type exposes the following members.

Constructors
  NameDescription
Protected method TimelineInitializes a new instance of the Timeline class.
Protected method Timeline(NullableTimeSpan)Initializes a new instance of the Timeline class with the specified BeginTime.
Protected method Timeline(NullableTimeSpan, Duration)Initializes a new instance of the Timeline class with the specified BeginTime and Duration.
Protected method Timeline(NullableTimeSpan, Duration, RepeatBehavior)Initializes a new instance of the Timeline class with the specified BeginTime, Duration, and RepeatBehavior.
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Properties
  NameDescription
Public property AccelerationRatioGets or sets a value specifying the percentage of the timeline's Duration spent accelerating the passage of time from zero to its maximum rate.
Public property AutoReverseGets or sets a value that indicates whether the timeline plays in reverse after it completes a forward iteration.
Public property BeginTimeGets or sets the time at which this Timeline should begin.
Public property CanFreezeGets a value that indicates whether the object can be made unmodifiable. (Inherited from Freezable.)
Public property DecelerationRatioGets or sets a value specifying the percentage of the timeline's Duration spent decelerating the passage of time from its maximum rate to zero.
Public property DependencyObjectTypeGets the DependencyObjectType that wraps the CLR type of this instance.  (Inherited from DependencyObject.)
Public property DispatcherGets the Dispatcher this DispatcherObject is associated with. (Inherited from DispatcherObject.)
Public property DurationGets or sets the length of time for which this timeline plays, not counting repetitions.
Public property FillBehaviorGets or sets a value that specifies how the Timeline behaves after it reaches the end of its active period.
Public property HasAnimatedPropertiesGets a value that indicates whether one or more AnimationClock objects is associated with any of this object's dependency properties. (Inherited from Animatable.)
Public property IsFrozenGets a value that indicates whether the object is currently modifiable. (Inherited from Freezable.)
Public property IsSealedGets a value that indicates whether this instance is currently sealed (read-only). (Inherited from DependencyObject.)
Public property Name Gets or sets the name of this Timeline.
Public property RepeatBehaviorGets or sets the repeating behavior of this timeline.
Public property SpeedRatioGets or sets the rate, relative to its parent, at which time progresses for this Timeline.
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Attached Properties
  NameDescription
Public attached property DesiredFrameRateGets or sets the desired frame rate for this timeline and its child timelines.
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Methods
  NameDescription
Protected method AllocateClockCreates a Clock for this Timeline.
Public method ApplyAnimationClock(DependencyProperty, AnimationClock)Applies an AnimationClock to the specified DependencyProperty. If the property is already animated, the SnapshotAndReplace handoff behavior is used. (Inherited from Animatable.)
Public method ApplyAnimationClock(DependencyProperty, AnimationClock, HandoffBehavior)Applies an AnimationClock to the specified DependencyProperty. If the property is already animated, the specified HandoffBehavior is used. (Inherited from Animatable.)
Public method BeginAnimation(DependencyProperty, AnimationTimeline)Applies an animation to the specified DependencyProperty. The animation is started when the next frame is rendered. If the specified property is already animated, the SnapshotAndReplace handoff behavior is used. (Inherited from Animatable.)
Public method BeginAnimation(DependencyProperty, AnimationTimeline, HandoffBehavior)Applies an animation to the specified DependencyProperty. The animation is started when the next frame is rendered. If the specified property is already animated, the specified HandoffBehavior is used. (Inherited from Animatable.)
Public method CheckAccessDetermines whether the calling thread has access to this DispatcherObject. (Inherited from DispatcherObject.)
Public method ClearValue(DependencyProperty)Clears the local value of a property. The property to be cleared is specified by a DependencyProperty identifier. (Inherited from DependencyObject.)
Public method ClearValue(DependencyPropertyKey)Clears the local value of a read-only property. The property to be cleared is specified by a DependencyPropertyKey. (Inherited from DependencyObject.)
Public method CloneCreates a modifiable clone of this Timeline, making deep copies of this object's values.
Protected method CloneCoreMakes the instance a clone (deep copy) of the specified Freezable using base (non-animated) property values. (Inherited from Freezable.)
Public method CloneCurrentValueCreates a modifiable clone of this Timeline object, making deep copies of this object's current values.
Protected method CloneCurrentValueCoreMakes the instance a modifiable clone (deep copy) of the specified Freezable using current property values. (Inherited from Freezable.)
Public method CoerceValueCoerces the value of the specified dependency property. This is accomplished by invoking any CoerceValueCallback function specified in property metadata for the dependency property as it exists on the calling DependencyObject. (Inherited from DependencyObject.)
Public method CreateClockCreates a new, controllable Clock from this Timeline. If this Timeline has children, a tree of clocks is created with this Timeline as the root.
Public method CreateClock(Boolean)Creates a new Clock from this Timeline and specifies whether the new Clock is controllable. If this Timeline has children, a tree of clocks is created with this Timeline as the root.
Protected method CreateInstanceInitializes a new instance of the Freezable class. (Inherited from Freezable.)
Protected method CreateInstanceCoreWhen implemented in a derived class, creates a new instance of the Freezable derived class. (Inherited from Freezable.)
Public method EqualsDetermines whether a provided DependencyObject is equivalent to the current DependencyObject. (Inherited from DependencyObject.)
Protected method FinalizeAllows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public method FreezeMakes the current object unmodifiable and sets its IsFrozen property to true. (Inherited from Freezable.)
Protected method FreezeCoreMakes this Timeline unmodifiable or determines whether it can be made unmodifiable. (Overrides AnimatableFreezeCore(Boolean).)
Public method GetAnimationBaseValueReturns the non-animated value of the specified DependencyProperty. (Inherited from Animatable.)
Public method GetAsFrozenCreates a frozen copy of the Freezable, using base (non-animated) property values. Because the copy is frozen, any frozen sub-objects are copied by reference. (Inherited from Freezable.)
Protected method GetAsFrozenCoreMakes this instance a clone of the specified Timeline object. (Overrides FreezableGetAsFrozenCore(Freezable).)
Public method GetCurrentValueAsFrozenCreates a frozen copy of the Freezable using current property values. Because the copy is frozen, any frozen sub-objects are copied by reference. (Inherited from Freezable.)
Protected method GetCurrentValueAsFrozenCoreMakes this instance a frozen clone of the specified Timeline. Resource references, data bindings, and animations are not copied, but their current values are. (Overrides FreezableGetCurrentValueAsFrozenCore(Freezable).)
Public method Static member GetDesiredFrameRateGets the desired frame rate of the specified Timeline.
Public method GetHashCodeGets a hash code for this DependencyObject. (Inherited from DependencyObject.)
Public method GetLocalValueEnumeratorCreates a specialized enumerator for determining which dependency properties have locally set values on this DependencyObject. (Inherited from DependencyObject.)
Protected method GetNaturalDurationReturns the length of a single iteration of this Timeline.
Protected method GetNaturalDurationCoreReturns the length of a single iteration of this Timeline. This method provides the implementation for GetNaturalDuration.
Public method GetTypeGets the Type of the current instance. (Inherited from Object.)
Public method GetValueReturns the current effective value of a dependency property on this instance of a DependencyObject. (Inherited from DependencyObject.)
Public method InvalidatePropertyRe-evaluates the effective value for the specified dependency property (Inherited from DependencyObject.)
Protected method MemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Protected method OnChangedCalled when the current Freezable object is modified. (Inherited from Freezable.)
Protected method OnFreezablePropertyChanged(DependencyObject, DependencyObject)Ensures that appropriate context pointers are established for a DependencyObjectType data member that has just been set. (Inherited from Freezable.)
Protected method OnFreezablePropertyChanged(DependencyObject, DependencyObject, DependencyProperty)This member supports the Windows Presentation Foundation (WPF) infrastructure and is not intended to be used directly from your code. (Inherited from Freezable.)
Protected method OnPropertyChangedOverrides the DependencyObject implementation of OnPropertyChanged to also invoke any Changed handlers in response to a changing dependency property of type Freezable. (Inherited from Freezable.)
Public method ReadLocalValueReturns the local value of a dependency property, if it exists. (Inherited from DependencyObject.)
Protected method ReadPreambleEnsures that the Freezable is being accessed from a valid thread. Inheritors of Freezable must call this method at the beginning of any API that reads data members that are not dependency properties. (Inherited from Freezable.)
Public method SetCurrentValueSets the value of a dependency property without changing its value source. (Inherited from DependencyObject.)
Public method Static member SetDesiredFrameRateSets the desired frame rate of the specified Timeline.
Public method SetValue(DependencyProperty, Object)Sets the local value of a dependency property, specified by its dependency property identifier. (Inherited from DependencyObject.)
Public method SetValue(DependencyPropertyKey, Object)Sets the local value of a read-only dependency property, specified by the DependencyPropertyKey identifier of the dependency property. (Inherited from DependencyObject.)
Protected method ShouldSerializePropertyReturns a value that indicates whether serialization processes should serialize the value for the provided dependency property. (Inherited from DependencyObject.)
Public method ToStringReturns a string that represents the current object. (Inherited from Object.)
Public method VerifyAccessEnforces that the calling thread has access to this DispatcherObject. (Inherited from DispatcherObject.)
Protected method WritePostscriptRaises the Changed event for the Freezable and invokes its OnChanged method. Classes that derive from Freezable should call this method at the end of any API that modifies class members that are not stored as dependency properties. (Inherited from Freezable.)
Protected method WritePreambleVerifies that the Freezable is not frozen and that it is being accessed from a valid threading context. Freezable inheritors should call this method at the beginning of any API that writes to data members that are not dependency properties. (Inherited from Freezable.)
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Events
  NameDescription
Public event ChangedOccurs when the Freezable or an object it contains is modified. (Inherited from Freezable.)
Public event CompletedOccurs when this timeline has completely finished playing: it will no longer enter its active period.
Public event CurrentGlobalSpeedInvalidatedOccurs when the rate at which time progresses for the timeline's clock changes.
Public event CurrentStateInvalidatedOccurs when the CurrentState property of the timeline's Clock is updated.
Public event CurrentTimeInvalidatedOccurs when the CurrentTime property of the timeline's Clock is updated.
Public event RemoveRequestedOccurs when the clock created for this timeline or one of its parent timelines is removed.
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Fields
  NameDescription
Public field Static member AccelerationRatioPropertyIdentifies the AccelerationRatio dependency property.
Public field Static member AutoReversePropertyIdentifies the AutoReverse dependency property.
Public field Static member BeginTimePropertyIdentifies the BeginTime dependency property.
Public field Static member DecelerationRatioPropertyIdentifies for the DecelerationRatio dependency property.
Public field Static member DesiredFrameRatePropertyIdentifies the DesiredFrameRate attached property.
Public field Static member DurationPropertyIdentifies the Duration dependency property.
Public field Static member FillBehaviorPropertyIdentifies the FillBehavior dependency property.
Public field Static member NamePropertyIdentifies the Name dependency property.
Public field Static member RepeatBehaviorPropertyIdentifies the RepeatBehavior dependency property.
Public field Static member SpeedRatioPropertyIdentifies for the SpeedRatio dependency property.
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Remarks

A timeline represents a segment of time. It provides properties that enable you to specify the length of that segment, when it should start, how many times it will repeat, how fast time progresses in that segment, and more.

Classes that inherit from the timeline class provide additional functionality, such as animation and media playback. The following are examples of some of the different types of specialized timelines available.

For more information about using timelines, see the Animation Overview. For an introduction to the timing features of timelines, see the Timing Behaviors Overview.

Data Binding and Animating Timelines

Most timeline properties can be data bound or animated; however, because of the way the timing system works, data bound or animated timelines do not behave like other data bound or animated objects. To understand their behavior, it helps to understand what it means to activate a timeline.

When a timeline is applied, copies are made of the timeline and its child timelines. These copies are frozen (made read-only) and Clock objects are created from them. It's these clocks that do the actual work of animating the targeted properties. If a timeline was data bound or animated, a snapshot of its current values was made when its clock was created. Even though the original timeline might continue to change, its clock does not.

For a timeline to reflect data binding or animation changes, its clock must be regenerated. Clocks are not regenerated for you automatically. The following are several ways to apply timeline changes:

  • If the timeline is or belongs to a Storyboard, you can make it reflect changes by reapplying its storyboard using a BeginStoryboard or the Begin method. This has the side effect of also restarting the animation. In code, you can use the Seek method to advance the storyboard back to its previous position.

  • If you applied an animation directly to a property using the BeginAnimation method, call the BeginAnimation method again and pass it the animation that's been modified.

  • If you are working directly at the clock level, create and apply a new set of clocks and use them to replace the previous set of generated clocks.

For an example of a data bound animation, see the Key Spline Animation Sample .

Using a Timeline as a Timer

A timeline's clock will only progress when there's an event hander associated with it or (in the case of an AnimationClock object) it is associated with a property. For this reason (and others), it's not recommended that you use a Timeline as a timer.

Examples

This example shows how to use a Storyboard to animate properties. To animate a property by using a Storyboard, create an animation for each property that you want to animate and also create a Storyboard to contain the animations.

The type of property determines the type of animation to use. For example, to animate a property that takes Double values, use a DoubleAnimation. The TargetName and TargetProperty attached properties specify the object and property to which the animation is applied.

To start a storyboard in Extensible Application Markup Language (XAML), use a BeginStoryboard action and an  EventTrigger. The EventTrigger begins the BeginStoryboard action when the event that is specified by its RoutedEvent property occurs. The BeginStoryboard action starts the Storyboard.

The following example uses Storyboard objects to animate two Button controls. To make the first button change in size, its Width is animated. To make the second button change color, the Color property of the SolidColorBrush is used to set the Background of the button that is animated.

<!-- StoryboardExample.xaml
     Uses storyboards to animate properties. -->
<Page
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  WindowTitle="Animate Properties with Storyboards">

  <Border Background="White">
    <StackPanel Margin="30" HorizontalAlignment="Left" MinWidth="500">

      <TextBlock>Storyboard Animation Example</TextBlock>

      <!-- The width of this button is animated. -->
      <Button Name="myWidthAnimatedButton"
        Height="30" Width="200" HorizontalAlignment="Left">
        A Button   
        <Button.Triggers>

          <!-- Animates the width of the first button 
               from 200 to 300. -->         
          <EventTrigger RoutedEvent="Button.Click">
            <BeginStoryboard>
              <Storyboard>           
                <DoubleAnimation Storyboard.TargetName="myWidthAnimatedButton"
                  Storyboard.TargetProperty="Width"
                  From="200" To="300" Duration="0:0:3" />
              </Storyboard>
            </BeginStoryboard>
          </EventTrigger>
        </Button.Triggers>
      </Button>

      <!-- The color of the brush used to paint this button is animated. -->
      <Button Height="30" Width="200" 
        HorizontalAlignment="Left">Another Button
        <Button.Background>
          <SolidColorBrush x:Name="myAnimatedBrush" Color="Blue" />
        </Button.Background>
        <Button.Triggers>

        <!-- Animates the color of the brush used to paint 
             the second button from red to blue . -->             
          <EventTrigger RoutedEvent="Button.Click">    
            <BeginStoryboard>
              <Storyboard>
                <ColorAnimation 
                  Storyboard.TargetName="myAnimatedBrush"
                  Storyboard.TargetProperty="Color"
                  From="Red" To="Blue" Duration="0:0:7" />
              </Storyboard>
            </BeginStoryboard>
          </EventTrigger>
        </Button.Triggers>
      </Button>
    </StackPanel>
  </Border>
</Page>
NoteNote

Although animations can target both a FrameworkElement object, such as a Control or Panel, and a Freezable object, such as a Brush or Transform, only framework elements have a Name property. To assign a name to a freezable so that it can be targeted by an animation, use the x:Name Directive, as the previous example shows.

If you use code, you must create a NameScope for a FrameworkElement and register the names of the objects to animate with that FrameworkElement. To start the animations in code, use a BeginStoryboard action with an EventTrigger. Optionally, you can use an event handler and the Begin method of Storyboard. The following example shows how to use the Begin method.

Imports System
Imports System.Windows
Imports System.Windows.Controls
Imports System.Windows.Media
Imports System.Windows.Media.Animation

Namespace SDKSample


    ' Uses a storyboard to animate the properties 
    ' of two buttons. 
    Public Class StoryboardExample
        Inherits Page

        Private Dim WithEvents myWidthAnimatedButton As Button
        Private Dim WithEvents myColorAnimatedButton As Button        
        Private Dim myWidthAnimatedButtonStoryboard As Storyboard
        Private Dim myColorAnimatedButtonStoryboard As Storyboard


        Public Sub New()
            ' Create a name scope for the page.
            NameScope.SetNameScope(Me, New NameScope())

            Me.WindowTitle = "Animate Properties using Storyboards" 
            Dim myStackPanel As New StackPanel()
            myStackPanel.MinWidth = 500
            myStackPanel.Margin = New Thickness(30)
            myStackPanel.HorizontalAlignment = HorizontalAlignment.Left
            Dim myTextBlock As New TextBlock()
            myTextBlock.Text = "Storyboard Animation Example"
            myStackPanel.Children.Add(myTextBlock)

            ' 
            ' Create and animate the first button. 
            ' 

            ' Create a button.
            myWidthAnimatedButton = New Button()
            myWidthAnimatedButton.Height = 30
            myWidthAnimatedButton.Width = 200
            myWidthAnimatedButton.HorizontalAlignment = HorizontalAlignment.Left
            myWidthAnimatedButton.Content = "A Button" 

            ' Set the Name of the button so that it can be referred 
            ' to in the storyboard that's created later. 
            ' The ID doesn't have to match the variable name; 
            ' it can be any unique identifier.
            myWidthAnimatedButton.Name = "myWidthAnimatedButton" 

            ' Register the name with the page to which the button belongs. 
            Me.RegisterName(myWidthAnimatedButton.Name, myWidthAnimatedButton)

            ' Create a DoubleAnimation to animate the width of the button. 
            Dim myDoubleAnimation As New DoubleAnimation()
            myDoubleAnimation.From = 200
            myDoubleAnimation.To = 300
            myDoubleAnimation.Duration = New Duration(TimeSpan.FromMilliseconds(3000))

            ' Configure the animation to target the button's Width property.
            Storyboard.SetTargetName(myDoubleAnimation, myWidthAnimatedButton.Name)
            Storyboard.SetTargetProperty(myDoubleAnimation, New PropertyPath(Button.WidthProperty))

            ' Create a storyboard to contain the animation.
            myWidthAnimatedButtonStoryboard = New Storyboard()
            myWidthAnimatedButtonStoryboard.Children.Add(myDoubleAnimation)

            myStackPanel.Children.Add(myWidthAnimatedButton)

            ' 
            ' Create and animate the second button. 
            ' 

            ' Create a second button.
            myColorAnimatedButton = New Button()
            myColorAnimatedButton.Height = 30
            myColorAnimatedButton.Width = 200
            myColorAnimatedButton.HorizontalAlignment = HorizontalAlignment.Left
            myColorAnimatedButton.Content = "Another Button" 

            ' Create a SolidColorBrush to paint the button's background. 
            Dim myBackgroundBrush As New SolidColorBrush()
            myBackgroundBrush.Color = Colors.Blue

            ' Because a Brush isn't a FrameworkElement, it doesn't 
            ' have a Name property to set. Instead, you just 
            ' register a name for the SolidColorBrush with 
            ' the page where it's used. 
            Me.RegisterName("myAnimatedBrush", myBackgroundBrush)

            ' Use the brush to paint the background of the button.
            myColorAnimatedButton.Background = myBackgroundBrush

            ' Create a ColorAnimation to animate the button's background. 
            Dim myColorAnimation As New ColorAnimation()
            myColorAnimation.From = Colors.Red
            myColorAnimation.To = Colors.Blue
            myColorAnimation.Duration = New Duration(TimeSpan.FromMilliseconds(7000))

            ' Configure the animation to target the brush's Color property.
            Storyboard.SetTargetName(myColorAnimation, "myAnimatedBrush")
            Storyboard.SetTargetProperty(myColorAnimation, New PropertyPath(SolidColorBrush.ColorProperty))

            ' Create a storyboard to contain the animation.
            myColorAnimatedButtonStoryboard = New Storyboard()
            myColorAnimatedButtonStoryboard.Children.Add(myColorAnimation)

            myStackPanel.Children.Add(myColorAnimatedButton)
            Me.Content = myStackPanel

        End Sub 

        ' Start the animation when the button is clicked. 
        Private Sub myWidthAnimatedButton_Loaded(ByVal sender as object, ByVal args as RoutedEventArgs) Handles myWidthAnimatedButton.Click

            myWidthAnimatedButtonStoryboard.Begin(myWidthAnimatedButton)

        End Sub         

        ' Start the animation when the button is clicked. 
        Private Sub myColorAnimatedButton_Loaded(ByVal sender as object, ByVal args as RoutedEventArgs) Handles myColorAnimatedButton.Click

            myColorAnimatedButtonStoryboard.Begin(myColorAnimatedButton)

        End Sub            

    End Class 
End Namespace
using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Media.Animation;

namespace Microsoft.Samples.Animation.AnimatingWithStoryboards
{


    // Uses a storyboard to animate the properties 
    // of two buttons. 
    public class StoryboardExample : Page
    {

        public StoryboardExample()
        {
            // Create a name scope for the page.
            NameScope.SetNameScope(this, new NameScope());

            this.WindowTitle = "Animate Properties using Storyboards";
            StackPanel myStackPanel = new StackPanel();
            myStackPanel.MinWidth = 500;
            myStackPanel.Margin = new Thickness(30);
            myStackPanel.HorizontalAlignment = HorizontalAlignment.Left;
            TextBlock myTextBlock = new TextBlock();
            myTextBlock.Text = "Storyboard Animation Example";
            myStackPanel.Children.Add(myTextBlock);

            // 
            // Create and animate the first button. 
            // 

            // Create a button.
            Button myWidthAnimatedButton = new Button();
            myWidthAnimatedButton.Height = 30;
            myWidthAnimatedButton.Width = 200;
            myWidthAnimatedButton.HorizontalAlignment = HorizontalAlignment.Left;
            myWidthAnimatedButton.Content = "A Button";

            // Set the Name of the button so that it can be referred 
            // to in the storyboard that's created later. 
            // The ID doesn't have to match the variable name; 
            // it can be any unique identifier.
            myWidthAnimatedButton.Name = "myWidthAnimatedButton";

            // Register the name with the page to which the button belongs. 
            this.RegisterName(myWidthAnimatedButton.Name, myWidthAnimatedButton);

            // Create a DoubleAnimation to animate the width of the button.
            DoubleAnimation myDoubleAnimation = new DoubleAnimation();
            myDoubleAnimation.From = 200;
            myDoubleAnimation.To = 300;
            myDoubleAnimation.Duration = new Duration(TimeSpan.FromMilliseconds(3000));          

            // Configure the animation to target the button's Width property.
            Storyboard.SetTargetName(myDoubleAnimation, myWidthAnimatedButton.Name); 
            Storyboard.SetTargetProperty(myDoubleAnimation, new PropertyPath(Button.WidthProperty));

            // Create a storyboard to contain the animation.
            Storyboard myWidthAnimatedButtonStoryboard = new Storyboard();
            myWidthAnimatedButtonStoryboard.Children.Add(myDoubleAnimation);

            // Animate the button width when it's clicked.
            myWidthAnimatedButton.Click += delegate(object sender, RoutedEventArgs args)
                {
                    myWidthAnimatedButtonStoryboard.Begin(myWidthAnimatedButton);
                };


            myStackPanel.Children.Add(myWidthAnimatedButton);

            // 
            // Create and animate the second button. 
            // 

            // Create a second button.
            Button myColorAnimatedButton = new Button();
            myColorAnimatedButton.Height = 30;
            myColorAnimatedButton.Width = 200;
            myColorAnimatedButton.HorizontalAlignment = HorizontalAlignment.Left;
            myColorAnimatedButton.Content = "Another Button";

            // Create a SolidColorBrush to paint the button's background.
            SolidColorBrush myBackgroundBrush = new SolidColorBrush();
            myBackgroundBrush.Color = Colors.Blue;

            // Because a Brush isn't a FrameworkElement, it doesn't 
            // have a Name property to set. Instead, you just 
            // register a name for the SolidColorBrush with 
            // the page where it's used. 
            this.RegisterName("myAnimatedBrush", myBackgroundBrush);

            // Use the brush to paint the background of the button.
            myColorAnimatedButton.Background = myBackgroundBrush;

            // Create a ColorAnimation to animate the button's background.
            ColorAnimation myColorAnimation = new ColorAnimation();
            myColorAnimation.From = Colors.Red;
            myColorAnimation.To = Colors.Blue;
            myColorAnimation.Duration = new Duration(TimeSpan.FromMilliseconds(7000));    

            // Configure the animation to target the brush's Color property.
            Storyboard.SetTargetName(myColorAnimation, "myAnimatedBrush");                        
            Storyboard.SetTargetProperty(myColorAnimation, new PropertyPath(SolidColorBrush.ColorProperty));    

            // Create a storyboard to contain the animation.
            Storyboard myColorAnimatedButtonStoryboard = new Storyboard();
            myColorAnimatedButtonStoryboard.Children.Add(myColorAnimation);

            // Animate the button background color when it's clicked.
            myColorAnimatedButton.Click += delegate(object sender, RoutedEventArgs args)
                {
                    myColorAnimatedButtonStoryboard.Begin(myColorAnimatedButton);
                };


            myStackPanel.Children.Add(myColorAnimatedButton);
            this.Content = myStackPanel;

        }
    }
}

For more information about animation and storyboards, see Animation Overview.

If you use code, you are not limited to using Storyboard objects in order to animate properties. For more information and examples, see How to: Animate a Property Without Using a Storyboard and How to: Animate a Property by Using an AnimationClock.

More Code

How to: Animate in a StyleThis example shows how to animate properties within a style. When animating within a style, only the framework element for which the style is defined can be targeted directly. To target a freezable object, you must "dot down" from a property of the styled element.
How to: Simplify Animations by Using Child TimelinesThis example shows how to simplify animations by using child ParallelTimeline objects. A Storyboard is a type of Timeline that provides targeting information for the timelines it contains. Use a Storyboard to provide timeline targeting information, including object and property information.
Version Information

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
Platforms

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Thread Safety
Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.