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POListbox ItemTemplate Selector does not pick a template
 

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  1. POListbox ItemTemplate Selector does not pick a template
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    <p>I am trying to use an ItemTemplateSelector on a listbox within a grid that I am creating on a different file to later be called by the MainWindow. </p> <p>Here is my DataTemplateSelector code</p> <pre><code> public class TemplateSelector : DataTemplateSelector { public override DataTemplate SelectTemplate(object item, DependencyObject container) { FrameworkElement element = container as FrameworkElement; if (element != null &amp;&amp; item != null &amp;&amp; item is myClass) { myClass agg = item as myClass; if(agg.myType == a) { return element.FindResource("greenItemTemplate") as DataTemplate; } else if (agg.myType == b) { return element.FindResource("yellowItemTemplate") as DataTemplate; } else if (agg.myType == c) { return element.FindResource("redItemTemplate") as DataTemplate; } } return null; } } </code></pre> <p>Here is my xaml</p> <pre><code> &lt;Grid x:Class="NS.Views.ListView" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:c="clr-namespace:NS.Commons" DataContext="{Binding}"&gt; &lt;Grid.Resources&gt; &lt;c:myConverter x:Key="converter" /&gt; &lt;c:TemplateSelector x:Key="borderSelector" /&gt; &lt;DataTemplate x:Key="greenItemTemplate"&gt; &lt;Border BorderThickness="3" BorderBrush="Green"&gt; &lt;StackPanel HorizontalAlignment="Stretch"&gt; &lt;TextBlock Text="{Binding Path=GroupName}"/&gt; &lt;TextBlock Text="{Binding Path=myType}"/&gt; &lt;/StackPanel&gt; &lt;/Border&gt; &lt;/DataTemplate&gt; &lt;DataTemplate x:Key="redItemTemplate"&gt; &lt;Border BorderThickness="3" BorderBrush="Red"&gt; &lt;StackPanel HorizontalAlignment="Stretch"&gt; &lt;TextBlock Text="{Binding Path=GroupName}"/&gt; &lt;TextBlock Text="{Binding Path=myType}"/&gt; &lt;/StackPanel&gt; &lt;/Border&gt; &lt;/DataTemplate&gt; &lt;DataTemplate x:Key="yellowItemTemplate"&gt; &lt;Border BorderThickness="3" BorderBrush="Yellow"&gt; &lt;StackPanel HorizontalAlignment="Stretch"&gt; &lt;TextBlock Text="{Binding Path=GroupName}"/&gt; &lt;TextBlock Text="{Binding Path=myType}"/&gt; &lt;/StackPanel&gt; &lt;/Border&gt; &lt;/DataTemplate&gt; &lt;/Grid.Resources&gt; &lt;ListBox ItemsSource="{Binding myCollectionOfMyClassObjects}" Name="listBox1" HorizontalContentAlignment="Stretch" ItemTemplateSelector="{StaticResource borderSelector}" &gt; &lt;/ListBox&gt; </code></pre> <p></p> <p>However, although the binding works fine (the list of non-formatted objects appears in the list), the ItemTemplateSelector is not calling the TemplateSelector methods. I put a breakpoint at the beginning of the methods and it's never called.</p> <p>Does anyone knows what could be the problem?</p>
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    1. USlocorecto
    1. USlocorecto
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    1. COBorderBrush of your Templates Border is always Green.
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      1. USFlorian Gl
    2. COThanks for the comment although that is not the problem. It was just the way I posted the question since I didn't want to post the exact code. Thanks again. Let me edit that so it doesn't become a distraction.
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    3. CODoes your `ItemsSource` of the `ListBox` change after it loads? I don't think `TemplateSelectors` respond to PropertyChanged or CollectionChanged events - They're just evaluated once when the program loads
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      1. USRachel
 

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