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7835248
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2011-10-20T11:28:21.320
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2011-10-20T11:55:50.073
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2011-10-20T11:55:50.073
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<p>As an alternative approach, I would suggest binding the <code>AlternationCount</code> of your <code>ItemsControl</code> to the number of items in your collection (e.g. the <code>Count</code> property). This will then assign to each container in your <code>ItemsControl</code> a unique <code>AlternationIndex</code> (0, 1, 2, ... Count-1). See here for more information:</p> <p><a href="http://msdn.microsoft.com/en-us/library/system.windows.controls.itemscontrol.alternationcount.aspx" rel="noreferrer">http://msdn.microsoft.com/en-us/library/system.windows.controls.itemscontrol.alternationcount.aspx</a></p> <p>Once each container has a unique <code>AlternationIndex</code> you can use a <code>DataTrigger</code> in your container <code>Style</code> to set the <code>ItemTemplate</code> based off of the index. This could be done using a <code>MultiBinding</code> with a converter that returns <code>True</code> if the index is equal the count, <code>False</code> otherwise. Of course you could also build a selector around this approach as well. With the exception of the converter, this approach is nice since it is a XAML only solution. </p> <p>An example using a <code>ListBox</code>:</p> <pre><code><Window x:Class="WpfApplication4.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:Collections="clr-namespace:System.Collections;assembly=mscorlib" xmlns:System="clr-namespace:System;assembly=mscorlib" xmlns:l="clr-namespace:WpfApplication4" Title="MainWindow" Height="350" Width="525"> <Grid> <Grid.Resources> <Collections:ArrayList x:Key="MyCollection"> <System:String>Item One</System:String> <System:String>Item Two</System:String> <System:String>Item Three</System:String> </Collections:ArrayList> <l:MyAlternationEqualityConverter x:Key="MyAlternationEqualityConverter" /> <Style x:Key="MyListBoxItemStyle" TargetType="{x:Type ListBoxItem}"> <Style.Triggers> <DataTrigger Value="True"> <DataTrigger.Binding> <MultiBinding Converter="{StaticResource MyAlternationEqualityConverter}"> <Binding RelativeSource="{RelativeSource FindAncestor, AncestorType={x:Type ListBox}}" Path="Items.Count" /> <Binding RelativeSource="{RelativeSource Self}" Path="(ItemsControl.AlternationIndex)" /> </MultiBinding> </DataTrigger.Binding>  <Setter Property="Background" Value="Red"/> </DataTrigger> </Style.Triggers> </Style> </Grid.Resources> <ListBox ItemsSource="{Binding Source={StaticResource MyCollection}}" AlternationCount="{Binding RelativeSource={RelativeSource Self}, Path=Items.Count}" ItemContainerStyle="{StaticResource MyListBoxItemStyle}" /> </Grid> </code></pre> <p></p> <p>Where the converter might look something like:</p> <pre><code>class MyAlternationEqualityConverter : IMultiValueConverter { #region Implementation of IMultiValueConverter public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture) { if (values != null && values.Length == 2 && values[0] is int && values[1] is int) { return Equals((int) values[0], (int) values[1] + 1); } return DependencyProperty.UnsetValue; } public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture) { throw new NotSupportedException(); } #endregion } </code></pre>
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