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IScrollInfo.LineDown Method

Scrolls down within content by one logical unit.

Namespace:  System.Windows.Controls.Primitives
Assembly:  PresentationFramework (in PresentationFramework.dll)
void LineDown()

This example shows how to scroll content by using the IScrollInfo interface.

The following example demonstrates the features of the IScrollInfo interface. The example creates a StackPanel element in Extensible Application Markup Language (XAML) that is nested in a parent ScrollViewer. The child elements of the StackPanel can be scrolled logically by using the methods defined by the IScrollInfo interface and cast to the instance of StackPanel (sp1) in code.

<Border BorderBrush="Black" Background="White" BorderThickness="2" Width="500" Height="500">
    <ScrollViewer Name="sv1" CanContentScroll="True" VerticalScrollBarVisibility="Visible" HorizontalScrollBarVisibility="Visible">
        <StackPanel Name="sp1">
            <Button>Button 1</Button>
            <Button>Button 2</Button>
            <Button>Button 3</Button>
            <Button>Button 4</Button>
            <Button>Button 5</Button>
            <Rectangle Width="700" Height="500" Fill="Purple"/>
            <TextBlock>Rectangle 1</TextBlock>
            <Rectangle Width="700" Height="500" Fill="Red"/>
            <TextBlock>Rectangle 2</TextBlock>
            <Rectangle Width="700" Height="500" Fill="Green"/>
            <TextBlock>Rectangle 3</TextBlock>
        </StackPanel> 
    </ScrollViewer>
</Border>

Each Button in the XAML file triggers an associated custom method that controls scrolling behavior in StackPanel. The following example shows how to use the LineUp and LineDown methods; it also generically shows how to use all the positioning methods that the IScrollInfo class defines.

private void spLineUp(object sender, RoutedEventArgs e)
{
    ((IScrollInfo)sp1).LineUp();
}
private void spLineDown(object sender, RoutedEventArgs e)
{
    ((IScrollInfo)sp1).LineDown();
}

.NET Framework

Supported in: 4.5.1, 4.5, 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows Phone 8.1, Windows Phone 8, 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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