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how-to-use-systemparameters.md

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How to: Use SystemParameters
Learn how to use the SystemParameters class and its properties to style or customize a button.
03/30/2017
csharp
vb
classes [WPF], SystemParameters
02e7a5de-94eb-4953-b91c-52e6c872ad5b

How to: Use SystemParameters

This example shows how to access and use the properties of xref:System.Windows.SystemParameters in order to style or customize a button.

Example

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.

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.

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.

[!code-xamlSystemRes_snip#ParameterStaticResources]

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.

[!code-csharpSystemRes_snip#ParameterResourcesCode] [!code-vbSystemRes_snip#ParameterResourcesCode]

See also