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POWPF style causing loop
 

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    <p>Why does the following XAML cause a stack overflow exception with some themes?</p> <pre><code>&lt;Application.Resources&gt; &lt;ResourceDictionary&gt; &lt;ResourceDictionary.MergedDictionaries&gt; &lt;ResourceDictionary Source="ExpressionLight.xaml"/&gt; &lt;/ResourceDictionary.MergedDictionaries&gt; &lt;Style x:Key="BaseButtonStyle" TargetType="{x:Type Button}" BasedOn="{StaticResource {x:Type Button}}"&gt; &lt;Setter Property="Margin" Value="5"/&gt; &lt;/Style&gt; &lt;Style TargetType="{x:Type Button}" BasedOn="{StaticResource BaseButtonStyle}"/&gt; &lt;/ResourceDictionary&gt; &lt;/Application.Resources&gt; </code></pre> <p>I have tried several themes found on internet and about half of them causes the exception.</p> <p>Is there another way to apply a named <code>Style</code> as default?</p> <p><strong>Edit:</strong></p> <p>The problem is that the <code>Theme</code> adds the default style to the resource dictionary (an entry with the name <code>System.Windows.Control.Button</code>). Since a dictionary can only contain a single entry for each key it is not possible add a new default within the same resource dictionary.</p> <p>Don't know why it leads to a "stackoverflow" instead of a "duplicate key" exception. It is probably because of the special handling of merged dictionaries which can contain duplicate keys.</p> <p>The solution is to apply the named <code>Style</code> as default in code:</p> <pre><code>void AppStartup(object sender, StartupEventArgs args) { this.Resources[typeof(Button)] = this.Resources["BaseButtonStyle"]; .... } </code></pre> <p>Since the <code>BaseButtonStyle</code> is staticly bound to the theme it is of course not possible to change theme at runtime with this solution.</p>
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