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POWPF XAML - Adding multiple styles to resource dictionary which target rowdefinition
 

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    <p>Thanks for your thoughts in helping a relative beginner understand WPF.</p> <p>I am trying to use the following style template in an XAML file for a WPF application:</p> <pre><code>&lt;Window.Resources&gt; &lt;ResourceDictionary&gt; &lt;ResourceDictionary.MergedDictionaries&gt; &lt;ResourceDictionary&gt; &lt;Style TargetType="{x:Type RowDefinition}" x:Key="hideIfNotDischarged"&gt; &lt;Style.Triggers&gt; &lt;DataTrigger Binding="{Binding DischargedBy28Days, Mode=OneWay}" Value="false"&gt; &lt;Setter Property="Height" Value="0" /&gt; &lt;/DataTrigger&gt; &lt;/Style.Triggers&gt; &lt;/Style&gt; &lt;Style TargetType="{x:Type RowDefinition}" x:Key="hideIfOutcomeKnownAndAlive"&gt; &lt;Style.Triggers&gt; &lt;DataTrigger Binding="{Binding IsKnownDead, Mode=OneWay}" Value="false"&gt; &lt;Setter Property="Height" Value="0" /&gt; &lt;/DataTrigger&gt; &lt;/Style.Triggers&gt; &lt;/Style&gt; &lt;/ResourceDictionary&gt; &lt;/ResourceDictionary.MergedDictionaries&gt; &lt;/ResourceDictionary&gt; &lt;/Window.Resources&gt; </code></pre> <p>which will be later used in a grid like so:</p> <pre><code>&lt;Grid&gt; &lt;Grid.RowDefinitions&gt; &lt;RowDefinition Height="Auto" /&gt; &lt;RowDefinition Height="30" /&gt; &lt;RowDefinition Style="{StaticResource hideIfNotDischarged}" /&gt; ... </code></pre> <p>However, if there is more than 1 style element targeting Type RowDefinition AND ALSO the ResourceDictionary is nested within a MergedDictionary (even with only a single child ResourceDictionary to merge) the application fails with</p> <p>System.Windows.ResourceDictionary.DeferrableContent: Item has already been added</p> <p>That is, despite the fact the 2 styles have different keys, the resource dictionary is trying to add a dictionary item with name based purely on the target type (and ignoring the key).</p> <p>Any help with how I might overcome this would be most appreciated.</p>
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    1. COYou can have multiple `RowDefinition` styles in your application as long as they have a unique key, I just copied the 2 style you have above into a ResourceDictionary and it compiled fine and both styles can be applied, I think you have another set of these styles somewhere or VS is having a caching issue, try clean and rebuilding the solution
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    2. COThank you for testing - I had tried to simplify the code but have found after further testing it is to do with using merged dictionaries. The codehas been edited
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    3. COtry declaring the `x:key` before the `TargetType` to avoid the `ResourceDictionary` checking the `TargetType` exists before it realizes it has a `x:Key`
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