FlowDocument.ColumnGap Property


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Gets or sets the column gap value, which indicates the spacing between columns in a FlowDocument.

Namespace:   System.Windows.Documents
Assembly:  PresentationFramework (in PresentationFramework.dll)

<LocalizabilityAttribute(LocalizationCategory.None, Readability := Readability.Unreadable)>
Public Property ColumnGap As Double

Property Value

Type: System.Double

The column gap, in device independent pixels. A value of Double.NaN (equivalent to an attribute value of "Auto") indicates that the column gap is equal to the LineHeight property. The default is Double.NaN.

Getting this property returns the current column gap. Setting this value changes the currently effective column gap, and may cause content to reflow.

The column gap cannot exceed the current PageWidth minus any PagePadding. If the value of the ColumnGap property exceeds this limit, the effective column gap is reduced to observe this limit.

This property has no effect if ColumnWidth is null.

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



String representation of a Double value equal to or greater than 0.0 but smaller than Double.PositiveInfinity. An unqualified value is measured in device independent pixels. Strings need not explicitly include decimal points.


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


Causes the effective spacing between columns to be set to the current value of the LineHeight property. Equivalent to a property value of NaN.

Identifier field


Metadata properties set to true


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

        Dim flowDocColGap As New FlowDocument(New Paragraph(New Run("A bit of text content...")))
' Set the desired column gap to 10 device independend pixels.
        flowDocColGap.ColumnGap = 10.0

.NET Framework
Available since 3.0
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