發行項
11/18/2011

BeginStoryboard Class

Microsoft Silverlight will reach end of support after October 2021. Learn more.

A trigger action that begins a Storyboard and distributes its animations to their targeted objects and properties.

Inheritance Hierarchy

System.Object
  System.Windows.DependencyObject
    System.Windows.TriggerAction
      System.Windows.Media.Animation.BeginStoryboard

Namespace: System.Windows.Media.Animation
Assembly: System.Windows (in System.Windows.dll)

Syntax

'Declaration
<ContentPropertyAttribute("Storyboard", True)> _
Public NotInheritable Class BeginStoryboard _
    Inherits TriggerAction

[ContentPropertyAttribute("Storyboard", true)]
public sealed class BeginStoryboard : TriggerAction

<BeginStoryboard ...>
  singleStoryboard
</BeginStoryboard>

XAML Values

singleStoryboard
A single Storyboard, object element.

The BeginStoryboard type exposes the following members.

Constructors

	Name	Description
	BeginStoryboard	Initializes a new instance of the BeginStoryboard class.

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Properties

	Name	Description
	Dispatcher	Gets the Dispatcher this object is associated with. (Inherited from DependencyObject.)
	Storyboard	Gets or sets the Storyboard that this BeginStoryboard starts.

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Methods

	Name	Description
	CheckAccess	Determines whether the calling thread has access to this object. (Inherited from DependencyObject.)
	ClearValue	Clears the local value of a dependency property. (Inherited from DependencyObject.)
	Equals(Object)	Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
	Finalize	Allows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.)
	GetAnimationBaseValue	Returns any base value established for a Silverlight dependency property, which would apply in cases where an animation is not active. (Inherited from DependencyObject.)
	GetHashCode	Serves as a hash function for a particular type. (Inherited from Object.)
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	GetValue	Returns the current effective value of a dependency property from a DependencyObject. (Inherited from DependencyObject.)
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	ReadLocalValue	Returns the local value of a dependency property, if a local value is set. (Inherited from DependencyObject.)
	SetValue	Sets the local value of a dependency property on a DependencyObject. (Inherited from DependencyObject.)
	ToString	Returns a string that represents the current object. (Inherited from Object.)

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Fields

	Name	Description
	StoryboardProperty	Identifies the Storyboard dependency property.

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Remarks

Triggers have only limited support in Silverlight. For more information, see Triggers.

BeginStoryboard is used as a wrapper around a Storyboard that is being triggered. A BeginStoryboard can only contain one Storyboard, not a collection of them.

In addition to starting a storyboard automatically when an object loads, you can use the interactive methods of the Storyboard object to start, pause, resume, and stop an animation. For more information, see Animation Overview.

The XAML syntax for BeginStoryboard and its Storyboard property is an example of XAML content property syntax. For more information on XAML content property syntax, see XAML Overview.

Examples

The following example shows how to use a Storyboard and a BeginStoryboard to make a rectangle that fades in and out of view after it is loaded.

Run this sample

<Canvas>
    <Rectangle
        x:Name="MyAnimatedRectangle"
        Width="100"
        Height="100"
        Fill="Blue">
        <Rectangle.Triggers>

            <!-- Animates the rectangle's opacity. -->
            <EventTrigger
                RoutedEvent="Rectangle.Loaded">
                <BeginStoryboard>
                    <Storyboard>
                        <DoubleAnimation
                            Storyboard.TargetName="MyAnimatedRectangle"
                            Storyboard.TargetProperty="Opacity"
                            From="1.0"
                            To="0.0"
                            Duration="0:0:5"
                            AutoReverse="True"
                            RepeatBehavior="Forever" />
                    </Storyboard>
                </BeginStoryboard>
            </EventTrigger>
        </Rectangle.Triggers>
    </Rectangle>
</Canvas>

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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.

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