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32 lines
2.1 KiB
Markdown
32 lines
2.1 KiB
Markdown
---
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title: "How to: Animate a Boolean by Using Key Frames"
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ms.date: "03/30/2017"
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dev_langs:
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- "csharp"
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- "vb"
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helpviewer_keywords:
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- "Booleans [WPF], animating with key frames"
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- "animation [WPF], Booleans with key frames"
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- "key frames [WPF], animating Booleans with"
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ms.assetid: 4b0fac96-6231-4fcf-9775-4dd673ddc785
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---
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# How to: Animate a Boolean by Using Key Frames
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This example shows how to animate the Boolean property value of a <xref:System.Windows.Controls.Button> control by using key frames.
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## Example
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The following example uses the <xref:System.Windows.Media.Animation.BooleanAnimationUsingKeyFrames> class to animate the <xref:System.Windows.UIElement.IsEnabled%2A> property of a <xref:System.Windows.Controls.Button> control. All the key frames in this example use an instance of the <xref:System.Windows.Media.Animation.DiscreteBooleanKeyFrame> class. Discrete key frames like <xref:System.Windows.Media.Animation.DiscreteBooleanKeyFrame> create sudden jumps between values, that is, the movement of the animation is jerky.
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[!code-csharp[keyframes_snip#BooleanAnimationUsingKeyFramesWholePage](~/samples/snippets/csharp/VS_Snippets_Wpf/keyframes_snip/CSharp/BooleanAnimationUsingKeyFramesExample.cs#booleananimationusingkeyframeswholepage)]
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[!code-vb[keyframes_snip#BooleanAnimationUsingKeyFramesWholePage](~/samples/snippets/visualbasic/VS_Snippets_Wpf/keyframes_snip/visualbasic/booleananimationusingkeyframesexample.vb#booleananimationusingkeyframeswholepage)]
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[!code-xaml[keyframes_snip#BooleanAnimationUsingKeyFramesWholePage](~/samples/snippets/xaml/VS_Snippets_Wpf/keyframes_snip/XAML/BooleanAnimationUsingKeyFramesExample.xaml#booleananimationusingkeyframeswholepage)]
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For the complete sample, see [KeyFrame Animation Sample](https://github.com/microsoft/WPF-Samples/tree/master/Animation/KeyFrameAnimation).
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## See also
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- <xref:System.Windows.Media.Animation.BooleanAnimationUsingKeyFrames>
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- <xref:System.Windows.UIElement.IsEnabled%2A>
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- <xref:System.Windows.Controls.Button>
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- [Key-Frame Animations Overview](key-frame-animations-overview.md)
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- [Key-Frame How-to Topics](key-frame-animation-how-to-topics.md)
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