AlternationConverter Class

 

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)

System.Object
  System.Windows.Controls.AlternationConverter

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

NameDescription
System_CAPS_pubmethodAlternationConverter()

Initializes a new instance of the AlternationConverter class.

NameDescription
System_CAPS_pubpropertyValues

Gets a list of objects that the AlternationConverter returns when an integer is passed to the Convert method.

NameDescription
System_CAPS_pubmethodConvert(Object, Type, Object, CultureInfo)

Converts an integer to an object in the Values list.

System_CAPS_pubmethodConvertBack(Object, Type, Object, CultureInfo)

Converts an object in the Values list to an integer.

System_CAPS_pubmethodEquals(Object)

Determines whether the specified object is equal to the current object.(Inherited from Object.)

System_CAPS_protmethodFinalize()

Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.(Inherited from Object.)

System_CAPS_pubmethodGetHashCode()

Serves as the default hash function. (Inherited from Object.)

System_CAPS_pubmethodGetType()

Gets the Type of the current instance.(Inherited from Object.)

System_CAPS_protmethodMemberwiseClone()

Creates a shallow copy of the current Object.(Inherited from Object.)

System_CAPS_pubmethodToString()

Returns a string that represents the current object.(Inherited from Object.)

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>

.NET Framework
Available since 3.0

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

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