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Block.LineHeight Property

.NET Framework 4.5

Gets or sets the height of each line of content.

Namespace: System.Windows.Documents
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

C++

[TypeConverterAttribute(typeof(LengthConverter))]
public double LineHeight { get; set; }

XAML Attribute Usage

<object LineHeight="double"/>
- or -
<object LineHeight="qualifiedDouble"/>
- or -
<object LineHeight="Auto"/>

XAML Values

double

Double

String representation of a Double value equal to or greater than 0.0034 but equal to or less than 160000. An unqualified value is measured in device independent pixels. Strings need not explicitly include decimal points.

qualifiedDouble

A double value as described above, (excepting Auto) followed by one of the following unit specifiers: 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

Auto

Causes the line height is determined automatically from the current font characteristics. Equivalent to a property value of Double.NaN.

Property Value

Type: System.Double
The height of each line in device independent pixels, in the range of 0.0034 to 160000, or Double.NaN to determine the height automatically. The default is Double.NaN.

Dependency Property Information

Identifier field	LineHeightProperty
Metadata properties set to true	AffectsMeasure, AffectsRender, Inherits

Exceptions

Exception	Condition
ArgumentException	LineHeight is set to a non-positive value.

Remarks

A value of Double.NaN (equivalent to an attribute value of Auto) indicates that the line height is determined automatically from the current font characteristics.

Changing this value does not change the height of the associated text; rather, it changes the height of the line that contains the text. To change the size of the text, use the FontSize property.

In addition to this property, the layout of lines in a Block is affected by its LineStackingStrategy property.

Examples

The following example shows how to set the LineHeight attribute of a Block element.

XAML

<FlowDocument>
  <Paragraph 
    TextAlignment="Left" 
    Background="AliceBlue"
    FontSize="24"
    LineHeight="48"
  >
    One<LineBreak/>
    two two<LineBreak/>
    Three Three Three<LineBreak/>
    four four four four<LineBreak/>
    Five Five Five Five Five
  </Paragraph>
</FlowDocument>

The following figure shows how the preceding example renders.

The following figure shows how the same FlowDocument renders with the default setting of LineHeight=Double.NaN.

Screenshot: FlowDocument LineHeight default

The following example shows how to set the LineHeight property programmatically.

Paragraph par = new Paragraph();
par.LineHeight = 48;

Version Information

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Platforms

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.

Reference

Block Class

System.Windows.Documents Namespace

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