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30 lines
2.2 KiB
Markdown
30 lines
2.2 KiB
Markdown
---
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title: "How to: Create a Rollover Effect Using Events"
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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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- "colors of elements [WPF], changing"
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- "rollover effect [WPF]"
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- "element colors [WPF], changing"
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ms.assetid: 3b20d028-6f1c-4b25-95d2-fa68cefbdb4c
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---
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# How to: Create a Rollover Effect Using Events
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This example shows how to change the color of an element as the mouse pointer enters and leaves the area occupied by the element.
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This example consists of a [!INCLUDE[TLA#tla_xaml](../../../includes/tlasharptla-xaml-md.md)] file and a code-behind file.
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> [!NOTE]
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> This example demonstrates how to use events, but the recommended way to achieve this same effect is to use a <xref:System.Windows.Trigger> in a style. For more information, see [Styling and Templating](/dotnet/desktop-wpf/fundamentals/styles-templates-overview).
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## Example
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The following XAML creates the user interface, which consists of <xref:System.Windows.Controls.Border> around a <xref:System.Windows.Controls.TextBlock>, and attaches the <xref:System.Windows.Input.Mouse.MouseEnter> and <xref:System.Windows.UIElement.MouseLeave> event handlers to the <xref:System.Windows.Controls.Border>.
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[!code-xaml[mouseenterMouseleave#MouseEnterLeaveSampleXAML](~/samples/snippets/csharp/VS_Snippets_Wpf/mouseenterMouseleave/CSharp/Window1.xaml#mouseenterleavesamplexaml)]
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The following code behind creates the <xref:System.Windows.UIElement.MouseEnter> and <xref:System.Windows.UIElement.MouseLeave> event handlers. When the mouse pointer enters the <xref:System.Windows.Controls.Border>, the background of the <xref:System.Windows.Controls.Border> is changed to red. When the mouse pointer leaves the <xref:System.Windows.Controls.Border>, the background of the <xref:System.Windows.Controls.Border> is changed back to white.
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[!code-csharp[mouseenterMouseleave#MouseEnterLeaveSampleEventHandlers](~/samples/snippets/csharp/VS_Snippets_Wpf/mouseenterMouseleave/CSharp/Window1.xaml.cs#mouseenterleavesampleeventhandlers)]
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[!code-vb[mouseenterMouseleave#MouseEnterLeaveSampleEventHandlers](~/samples/snippets/visualbasic/VS_Snippets_Wpf/mouseenterMouseleave/VisualBasic/Window1.xaml.vb#mouseenterleavesampleeventhandlers)]
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