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Timeline Class


Defines a duration and other behavior properties for a Windows Runtime animation. Timeline is the base class for Storyboard and all the Windows Runtime animation types, including those from the animation library and those used for custom animations in visual states or page-level XAML.

public ref class Timeline : DependencyObject
/// [Windows.Foundation.Metadata.ContractVersion(Windows.Foundation.UniversalApiContract, 65536)]
/// [Windows.Foundation.Metadata.MarshalingBehavior(Windows.Foundation.Metadata.MarshalingType.Agile)]
/// [Windows.Foundation.Metadata.Threading(Windows.Foundation.Metadata.ThreadingModel.Both)]
class Timeline : DependencyObject
[Windows.Foundation.Metadata.ContractVersion(typeof(Windows.Foundation.UniversalApiContract), 65536)]
public class Timeline : DependencyObject
Public Class Timeline
Inherits DependencyObject
Object Platform::Object IInspectable DependencyObject Timeline

Windows requirements

Device family
Windows 10 (introduced in 10.0.10240.0)
API contract
Windows.Foundation.UniversalApiContract (introduced in v1.0)


Timeline defines the Duration property that controls how long an animation runs once started. Timeline also defines these behavior properties, which are common to all animations types, and to Storyboard:

Timeline also defines the Completed event for Storyboard and animations. Handling the Completed event isn't necessary or most UI animation scenarios.

The relationship between Storyboard and the animation types is that a Storyboard is a container that can group multiple animations, and acts as the controller for starting and stopping the contained animations. When you set Timeline properties on a Storyboard as opposed to individual animations within a Storyboard, the Timeline properties set in the Storyboard typically override those from the combined animations. For more info see Storyboarded animations.

Timeline has a strongly typed collection class that is used for properties that take a set of Timeline values, such as Storyboard.Children. For more info see TimelineCollection.

Timeline derived classes

Timeline is the parent class for several immediately derived classes that support the storyboarded animation system and also the built-in library animations. Here are some of the notable derived classes:


Theme transitions don't derive from Timeline, they derive from Transition.



Provides base class initialization behavior for Timeline-derived classes.



Gets or sets a value that determines whether dependent animations should be permitted to run, throughout the app.


Gets or sets a value that indicates whether the timeline plays in reverse after it completes a forward iteration.


Identifies the AutoReverse  dependency property.


Gets or sets the time at which this Timeline should begin.


Identifies the BeginTime  dependency property.


Gets the CoreDispatcher that this object is associated with. The CoreDispatcher represents a facility that can access the DependencyObject on the UI thread even if the code is initiated by a non-UI thread.

(Inherited from DependencyObject)

Gets or sets the length of time for which this timeline plays, not counting repetitions.


Identifies the Duration  dependency property.


Gets or sets a value that specifies how the animation behaves after it reaches the end of its active period.


Identifies the FillBehavior  dependency property.


Gets or sets the repeating behavior of this timeline.


Identifies the RepeatBehavior  dependency property.


Gets or sets the rate, relative to its parent, at which time progresses for this Timeline.


Identifies for the SpeedRatio  dependency property.



Clears the local value of a dependency property.

(Inherited from DependencyObject)

Returns any base value established for a dependency property, which would apply in cases where an animation is not active.

(Inherited from DependencyObject)

Returns the current effective value of a dependency property from a DependencyObject.

(Inherited from DependencyObject)

Returns the local value of a dependency property, if a local value is set.

(Inherited from DependencyObject)
RegisterPropertyChangedCallback(DependencyProperty, DependencyPropertyChangedCallback)

Registers a notification function for listening to changes to a specific DependencyProperty on this DependencyObject instance.

(Inherited from DependencyObject)
SetValue(DependencyProperty, Object)

Sets the local value of a dependency property on a DependencyObject.

(Inherited from DependencyObject)
UnregisterPropertyChangedCallback(DependencyProperty, Int64)

Cancels a change notification that was previously registered by calling RegisterPropertyChangedCallback.

(Inherited from DependencyObject)



Occurs when the Storyboard object has completed playing.

Applies to

See also