Skip to main content
.NET Framework Class Library
ControlFontSize 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
Syntax
<[%$TOPIC/ms592514_en-us_VS_110_1_0_0_0_0%](GetType([%$TOPIC/ms592514_en-us_VS_110_1_0_0_0_1%]))> _
<[%$TOPIC/ms592514_en-us_VS_110_1_0_0_0_2%](True)> _
<[%$TOPIC/ms592514_en-us_VS_110_1_0_0_0_3%]([%$TOPIC/ms592514_en-us_VS_110_1_0_0_0_4%].None)> _
Public Property FontSize As [%$TOPIC/ms592514_en-us_VS_110_1_0_0_0_5%]
[[%$TOPIC/ms592514_en-us_VS_110_1_0_1_0_0%](typeof([%$TOPIC/ms592514_en-us_VS_110_1_0_1_0_1%]))]
[[%$TOPIC/ms592514_en-us_VS_110_1_0_1_0_2%](true)]
[[%$TOPIC/ms592514_en-us_VS_110_1_0_1_0_3%]([%$TOPIC/ms592514_en-us_VS_110_1_0_1_0_4%].None)]
public [%$TOPIC/ms592514_en-us_VS_110_1_0_1_0_5%] FontSize { get; set; }
[[%$TOPIC/ms592514_en-us_VS_110_1_0_2_0_0%](typeof([%$TOPIC/ms592514_en-us_VS_110_1_0_2_0_1%]))]
[[%$TOPIC/ms592514_en-us_VS_110_1_0_2_0_2%](true)]
[[%$TOPIC/ms592514_en-us_VS_110_1_0_2_0_3%]([%$TOPIC/ms592514_en-us_VS_110_1_0_2_0_4%]::None)]
public:
property [%$TOPIC/ms592514_en-us_VS_110_1_0_2_0_5%] FontSize {
	[%$TOPIC/ms592514_en-us_VS_110_1_0_2_0_6%] get ();
	void set ([%$TOPIC/ms592514_en-us_VS_110_1_0_2_0_7%] value);
}
[<[%$TOPIC/ms592514_en-us_VS_110_1_0_3_0_0%](typeof([%$TOPIC/ms592514_en-us_VS_110_1_0_3_0_1%]))>]
[<[%$TOPIC/ms592514_en-us_VS_110_1_0_3_0_2%](true)>]
[<[%$TOPIC/ms592514_en-us_VS_110_1_0_3_0_3%]([%$TOPIC/ms592514_en-us_VS_110_1_0_3_0_4%].None)>]
member FontSize : [%$TOPIC/ms592514_en-us_VS_110_1_0_3_0_5%] with get, set
function get FontSize () : [%$TOPIC/ms592514_en-us_VS_110_1_0_4_0_0%] 
function set FontSize (value : [%$TOPIC/ms592514_en-us_VS_110_1_0_4_0_1%])
<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 ControlFontSize does not render if set to "Auto".

Property Value

Type: SystemDouble
The size of the text in the Control. The default is SystemFontsMessageFontSize. The font size must be a positive number.
Remarks

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

Examples

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

<Button Name="btn3" FontSize="10.0" 
        Click="ChangeFontSize">
  FontSize
</Button>
Private Sub ChangeFontSize(ByVal Sender As Object, ByVal e As RoutedEventArgs)

    fsize = btn3.FontSize
    If (fsize = 16.0) Then

        btn3.FontSize = 10.0
        btn3.Content = "FontSize" 

    Else

        btn3.FontSize = 16.0
        btn3.Content = "Control font size changes from 10 to 16." 
    End If 
End Sub
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.";
    }
}
Version Information

.NET Framework

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

.NET Framework Client Profile

Supported in: 4, 3.5 SP1