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35 lines
3.0 KiB
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35 lines
3.0 KiB
Markdown
---
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title: "How to: Use SystemParameters"
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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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- "classes [WPF], SystemParameters"
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ms.assetid: 02e7a5de-94eb-4953-b91c-52e6c872ad5b
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---
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# How to: Use SystemParameters
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This example shows how to access and use the properties of <xref:System.Windows.SystemParameters> in order to style or customize a button.
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## Example
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System resources expose several system based settings as resources in order to help you create visuals that are consistent with system settings. <xref:System.Windows.SystemParameters> is a class that contains both system parameter value properties, and resource keys that bind to the values. For example, <xref:System.Windows.SystemParameters.FullPrimaryScreenHeight%2A> is a <xref:System.Windows.SystemParameters> property value and <xref:System.Windows.SystemParameters.FullPrimaryScreenHeightKey%2A> is the corresponding resource key.
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In XAML, you can use the members of <xref:System.Windows.SystemParameters> as either a static property usage, or a dynamic resource references (with the static property value as the key). Use a dynamic resource reference if you want the system based value to update automatically while the application runs; otherwise, use a static reference. Resource keys have the suffix `Key` appended to the property name.
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The following example shows how to access and use the static values of <xref:System.Windows.SystemParameters> to style or customize a button. This markup example sizes a button by applying <xref:System.Windows.SystemParameters> values to a button.
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[!code-xaml[SystemRes_snip#ParameterStaticResources](~/samples/snippets/csharp/VS_Snippets_Wpf/SystemRes_snip/CSharp/Pane1.xaml#parameterstaticresources)]
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To use the values of <xref:System.Windows.SystemParameters> in code, you do not have to use either static references or dynamic resource references. Instead, use the values of the <xref:System.Windows.SystemParameters> class. Although the non-key properties are apparently defined as static properties, the runtime behavior of WPF as hosted by the system will reevaluate the properties in realtime, and will properly account for user-driven changes to system values. The following example shows how to set the width and height of a button by using <xref:System.Windows.SystemParameters> values.
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[!code-csharp[SystemRes_snip#ParameterResourcesCode](~/samples/snippets/csharp/VS_Snippets_Wpf/SystemRes_snip/CSharp/Pane1.xaml.cs#parameterresourcescode)]
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[!code-vb[SystemRes_snip#ParameterResourcesCode](~/samples/snippets/visualbasic/VS_Snippets_Wpf/SystemRes_snip/VisualBasic/Pane1.xaml.vb#parameterresourcescode)]
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## See also
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- <xref:System.Windows.SystemParameters>
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- [Paint an Area with a System Brush](../graphics-multimedia/how-to-paint-an-area-with-a-system-brush.md)
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- [Use SystemFonts](how-to-use-systemfonts.md)
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- [Use System Parameters Keys](how-to-use-system-parameters-keys.md)
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- [How-to Topics](resources-how-to-topics.md)
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