AnchoredBlock.LineHeight Property

Reference

Definition

Namespace:: System.Windows.Documents

Assembly:: PresentationFramework.dll

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Gets or sets the height of each line of content.

public:
 property double LineHeight { double get(); void set(double value); };

[System.ComponentModel.TypeConverter(typeof(System.Windows.LengthConverter))]
public double LineHeight { get; set; }

[<System.ComponentModel.TypeConverter(typeof(System.Windows.LengthConverter))>]
member this.LineHeight : double with get, set

Public Property LineHeight As Double

Property Value

Double

A double value specifying the height of line in device independent pixels. LineHeight must be equal to or greater than 0.0034 and equal to or less then 160000.

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

The default value is NaN.

Attributes: TypeConverterAttribute

Exceptions

ArgumentException

Raised if an attempt is made to set LineHeight to a non-positive value.

Examples

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

<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 previous example renders.

Screenshot: FlowDocument LineHeight

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

Screenshot: FlowDocument LineHeight default

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

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

Dim par As New Paragraph()
par.LineHeight = 48

Remarks

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

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

XAML Attribute Usage

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

XAML Values

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 NaN.

Dependency Property Information

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

Applies to

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