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POCan a DataTemplate be tied to a nested class?
 

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    <p>Can a DataTemplate in XAML be associated with a nested class?</p> <p>I am working on a MVVM application, and I have run into a data template problem. I have a view model providing a collection of other view models for an items control. These items are part of a hierarchy defined as nested classes in the outer view model. I have been unable so far to create a mapping in XAML to reference the inner nested class.</p> <p>Here is the class hierarchy (simplified for brevity):</p> <pre><code>public class MainViewModel { public class A { } public class B : A { } public class C : A { } public ObservableCollection&lt;A&gt; Items { get; set; } } </code></pre> <p>In XAML, I'm trying to map a DataTemplate to types B and C, but I cannot fully qualify the nested class name.</p> <pre><code>&lt;ItemsControl ItemsSource="{Binding Path=Items}"&gt; &lt;ItemsControl.Resources&gt; &lt;DataTemplate DataType="{x:Type ns:BracingViewModel.B}"&gt; &lt;Grid&gt; .... &lt;/Grid&gt; &lt;/DataTemplate&gt; &lt;DataTemplate DataType="{x:Type ns:BracingViewModel.C}"&gt; &lt;Grid&gt; .... &lt;/Grid&gt; &lt;/DataTemplate&gt; &lt;/ItemsControl.Resources&gt; &lt;/ItemsControl&gt; </code></pre> <p>The problem : the references to the nested classes show up as a build error in the XAML. I get the following:</p> <pre><code>Error 5 Cannot find the type 'ns:B'. Note that type names are case sensitive. Line... Error 5 Cannot find the type 'ns:C'. Note that type names are case sensitive. Line... </code></pre> <p>If I move the A,B,C class hierarchy outside the MainViewModel class (i.e. to the namespace level), this works fine. </p> <p>As a general habit, I try to keep classes relevant to the view model defined as nested classes within it, but that leads me to this issue.</p> <p>So, my question : is it even possible to associate a DataTemplate with a nested class? If so, how is that done in the XAML portion?</p> <p>Thanks in advance... Joe</p>
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