XAML Developer Reference

Troubleshooting Resources, Styles, and Triggers

If you reference a style in a StaticResource extension and the style is not defined at all in your application, you will get an XamlParseException. However, a XamlParseException can occur in several other scenarios as well. For example, if you define a style twice in your application with the same key identifier, you will get a XamlParseException. The following code shows an example of such a scenario:

<Grid.Resources>
   <Style x:Key="lstStyle" TargetType="ListBox">
     <Setter Property="BorderBrush" Value="Blue"></Setter>
   </Style>
   <Style x:Key="lstStyle" TargetType="ListBox">
     <Setter Property="Background" Value="PaleGreen"></Setter>
   </Style>
<Grid.Resources>

To identify why exactly the exception occurred ...