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34 lines
2.3 KiB
Markdown
34 lines
2.3 KiB
Markdown
---
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title: "How to: Specify Whether a Hyperlink is Underlined"
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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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- "Hyperlink control type [WPF]"
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ms.assetid: 3996cfe6-1dac-4835-aeb3-c719ce9cfee5
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---
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# How to: Specify Whether a Hyperlink is Underlined
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The <xref:System.Windows.Documents.Hyperlink> object is an inline-level flow content element that allows you to host hyperlinks within the flow content. By default, <xref:System.Windows.Documents.Hyperlink> uses a <xref:System.Windows.TextDecoration> object to display an underline. <xref:System.Windows.TextDecoration> objects can be performance intensive to instantiate, particularly if you have many <xref:System.Windows.Documents.Hyperlink> objects. If you make extensive use of <xref:System.Windows.Documents.Hyperlink> elements, you may want to consider showing an underline only when triggering an event, such as the <xref:System.Windows.ContentElement.MouseEnter> event.
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In the following example, the underline for the "My MSN" link is dynamic, that is, it only appears when the <xref:System.Windows.ContentElement.MouseEnter> event is triggered.
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## Example
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The following markup sample shows a <xref:System.Windows.Documents.Hyperlink> defined with and without an underline:
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[!code-xaml[Performance#PerformanceSnippet11](~/samples/snippets/csharp/VS_Snippets_Wpf/Performance/CSharp/Hyperlink.xaml#performancesnippet11)]
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The following code sample shows how to create an underline for the <xref:System.Windows.Documents.Hyperlink> on the <xref:System.Windows.ContentElement.MouseEnter> event, and remove it on the <xref:System.Windows.ContentElement.MouseLeave> event.
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[!code-csharp[Performance#PerformanceSnippet15](~/samples/snippets/csharp/VS_Snippets_Wpf/Performance/CSharp/Hyperlink.xaml.cs#performancesnippet15)]
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[!code-vb[Performance#PerformanceSnippet15](~/samples/snippets/visualbasic/VS_Snippets_Wpf/Performance/visualbasic/hyperlink.xaml.vb#performancesnippet15)]
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## See also
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- <xref:System.Windows.TextDecoration>
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- <xref:System.Windows.Documents.Hyperlink>
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- [Optimizing WPF Application Performance](optimizing-wpf-application-performance.md)
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- [Create a Text Decoration](how-to-create-a-text-decoration.md)
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