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dotnet-desktop-guide/framework/wpf/advanced/how-to-use-system-fonts-keys.md
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---
title: "How to: Use System Fonts Keys"
ms.date: "03/30/2017"
helpviewer_keywords:
- "resource keys [WPF], SystemFonts class"
ms.assetid: 036ebea7-5677-4f60-8ba4-56c9f9d9b8bd
---
# How to: Use System Fonts Keys
System resources expose a number of system metrics as resources to help developers create visuals that are consistent with system settings. <xref:System.Windows.SystemFonts> is a class that contains both system font values and system font resources that bind to the values—for example, <xref:System.Windows.SystemFonts.CaptionFontFamily%2A> and <xref:System.Windows.SystemFonts.CaptionFontFamilyKey%2A>.
System font metrics can be used as either static or dynamic resources. Use a dynamic resource if you want the font metric to update automatically while the application runs; otherwise use a static resource.
> [!NOTE]
> Dynamic resources have the keyword *Key* appended to the property name.
The following example shows how to access and use system font dynamic resources to style or customize a button. This [!INCLUDE[TLA2#tla_xaml](../../../includes/tla2sharptla-xaml-md.md)] example creates a button style that assigns <xref:System.Windows.SystemFonts> values to a button.
## Example
[!code-xaml[SystemRes_snip#FontDynamicResources](~/samples/snippets/csharp/VS_Snippets_Wpf/SystemRes_snip/CSharp/MyApp.xaml#fontdynamicresources)]
## See also
- [Paint an Area with a System Brush](../graphics-multimedia/how-to-paint-an-area-with-a-system-brush.md)
- [Use SystemParameters](how-to-use-systemparameters.md)
- [Use SystemFonts](how-to-use-systemfonts.md)