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Control.FontSize Property

Gets or sets the font size.

Namespace:  System.Windows.Controls
Assembly:  PresentationFramework (in PresentationFramework.dll)
XMLNS for XAML: http://schemas.microsoft.com/winfx/2006/xaml/presentation, http://schemas.microsoft.com/netfx/2007/xaml/presentation

[BindableAttribute(true)]
[LocalizabilityAttribute(LocalizationCategory.None)]
[TypeConverterAttribute(typeof(FontSizeConverter))]
public double FontSize { get; set; }
<object FontSize="double"/>
- or –
<object FontSize ="qualifiedDouble"/>

XAML Values

double

Double

A string representation of a Double value. This is interpreted as a device-independent unit (1/96th inch) measurement. Strings need not explicitly include decimal points. For example, a value of 1 is acceptable.

The same Double range restrictions that are mentioned in the Property Value section apply here.

qualifiedDouble

A double value as previously described that is followed by one of these unit declaration strings: px, in, cm, pt.

px (default) is device-independent units (1/96th inch per unit)

in is inches; 1in==96px

cm is centimeters; 1cm==(96/2.54) px

pt is points; 1pt==(96/72) px

Note   In many cases a double may be set to "Auto," but a Control.FontSize does not render if set to "Auto".

Property Value

Type: System.Double
The size of the text in the Control. The default is SystemFonts.MessageFontSize. The font size must be a positive number.

This property only affects a control whose template uses the FontSize property as a parameter. On other controls, this property has no impact.

The following example shows how to set the font size property of a control.

<Button Name="btn3" FontSize="10.0" 
        Click="ChangeFontSize">
  FontSize
</Button>
void ChangeFontSize(object sender, RoutedEventArgs e)
{
    fsize = btn3.FontSize;
    if (fsize == 16.0)
    {
        btn3.FontSize = 10.0;
        btn3.Content = "FontSize";
    }
    else
    {
        btn3.FontSize = 16.0;
        btn3.Content = "Control font size changes from 10 to 16.";
    }
}

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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