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AlternationConverter Class

Updated: July 2008

Converts an integer to and from an object by applying the integer as an index to a list of objects.

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

[ContentPropertyAttribute("Values")]
public class AlternationConverter : IValueConverter
<AlternationConverter>
  Values
</AlternationConverter>

You can use the AlternationConverter to bind a property to alternating values. For example, if you want items in a ListBox to have alternating blue and light blue backgrounds, you do the following:

The following example creates a ListBox and uses two AlternationConverter objects to alternate the Background and FontStyle of the items.

<Grid>
  <Grid.Resources>
    <AlternationConverter x:Key="BackgroundConverter">
      <SolidColorBrush>Blue</SolidColorBrush>
      <SolidColorBrush>LightBlue</SolidColorBrush>
    </AlternationConverter>

    <AlternationConverter x:Key="FontStyleConverter">
      <FontStyle >Italic</FontStyle>
      <FontStyle >Normal</FontStyle>
    </AlternationConverter>

    <Style x:Key="alternatingWithBinding" TargetType="{x:Type ListBoxItem}">
      <Setter Property="Background" 
              Value="{Binding RelativeSource={RelativeSource Self},
                     Path=(ItemsControl.AlternationIndex),
                     Converter={StaticResource BackgroundConverter}}"/>

      <Setter Property="FontStyle" 
              Value="{Binding RelativeSource={RelativeSource Self},
                     Path=(ItemsControl.AlternationIndex),
                     Converter={StaticResource FontStyleConverter}}"/>
    </Style>

  </Grid.Resources>

  <ListBox AlternationCount="2" ItemsSource="{StaticResource data}"
           ItemContainerStyle="{StaticResource alternatingWithBinding}"/>
</Grid>

System.Object
  System.Windows.Controls.AlternationConverter

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5 SP1, 3.0 SP2

Date

History

Reason

July 2008

Added topic for new class.

SP1 feature change.

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