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POData-based template selection in WPF
 

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    <p>I have this simple XAML example:</p> <pre><code>&lt;Window x:Class="DynTemplateTest.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Window1" Height="300" Width="300"&gt; &lt;Window.Resources&gt; &lt;DataTemplate x:Key="ItemTemplate"&gt; &lt;ItemsControl ItemsSource="{Binding}"&gt; &lt;ItemsControl.ItemTemplate&gt; &lt;DataTemplate&gt; &lt;Rectangle Width="30" Height="30" Fill="Red"&gt;&lt;/Rectangle&gt; &lt;/DataTemplate&gt; &lt;/ItemsControl.ItemTemplate&gt; &lt;ItemsControl.ItemsPanel&gt; &lt;ItemsPanelTemplate&gt; &lt;Canvas /&gt; &lt;/ItemsPanelTemplate&gt; &lt;/ItemsControl.ItemsPanel&gt; &lt;ItemsControl.ItemContainerStyle&gt; &lt;Style&gt; &lt;Setter Property="Canvas.Left" Value="{Binding Position}"&gt;&lt;/Setter&gt; &lt;/Style&gt; &lt;/ItemsControl.ItemContainerStyle&gt; &lt;/ItemsControl&gt; &lt;/DataTemplate&gt; &lt;/Window.Resources&gt; &lt;DockPanel LastChildFill="True"&gt; &lt;ContentPresenter Content="{Binding Path=Items}" ContentTemplate="{StaticResource ItemTemplate}" &gt; &lt;/ContentPresenter&gt; &lt;/DockPanel&gt; &lt;/Window&gt; </code></pre> <p>It is rendering my items in the observable collection in MVVM style. Each item is having its horizontal position in a property. Each item also has a property IsSpecial which tells if it wants to be rendered in some special way. I want ordinary items (IsSpecial=false) render as red squares (already in the code) and special items as blue circles with "special" text inside.</p> <p>What I do not know is how to adjust the XAML code to do the template selection for the items. Is there a way to do that without coding my own ItemTemplateSelector? Will it still work with the canvas positioning based on binding. I think that the solution is to extract the item template to a separate template, create one more template for special items and then somehow play with triggers ... but it is not very easy for me as I am a WPF beginner at the moment.</p> <p>The other thing is that I quite dislike the way how the Position is passed to the items. Is there some other way?</p> <p>Are there any other recommendations how to improve the code?</p>
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