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POHow to Define Common Resources Across WPF Applications (including templates)?
 

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  1. POHow to Define Common Resources Across WPF Applications (including templates)?
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    <p>I am looking for a way to define a WPF resource (for now, to be used as a static resource) that is accessible from everywhere within my application.</p> <p>My resource is defined in this resource dictionary:</p> <pre><code>&lt;ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"&gt; &lt;Style x:Key="flatButtonStyle" BasedOn="{StaticResource {x:Static ToolBar.ButtonStyleKey}}" TargetType="{x:Type Button}"&gt; &lt;Setter Property="BorderThickness" Value="4"/&gt; &lt;/Style&gt; &lt;/ResourceDictionary&gt; </code></pre> <p>The selected answer to <a href="https://stackoverflow.com/questions/703026/shared-resource-dictionary-between-several-user-controls-and-across-assemblies/705061">this question</a> indicates that I must merge that resource dictionary into my <code>App.xaml</code> file (of a project called <code>AppWideResources</code>):</p> <pre><code>&lt;Application x:Class="AppWideResources.App" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" StartupUri="Window1.xaml"&gt; &lt;Application.Resources&gt; &lt;ResourceDictionary&gt; &lt;ResourceDictionary.MergedDictionaries&gt; &lt;ResourceDictionary Source="/AppWideResources;component/CommonResources.xaml"/&gt; &lt;/ResourceDictionary.MergedDictionaries&gt; &lt;/ResourceDictionary&gt; &lt;/Application.Resources&gt; &lt;/Application&gt; </code></pre> <p>At first, this seems to work; the button in this window is appropriately styled in a flat way with an extra-thick border:</p> <pre><code>&lt;Window x:Class="AppWideResources.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="AppWideResources" Height="300" Width="300" &gt; &lt;StackPanel&gt; &lt;Button Style="{StaticResource flatButtonStyle}" Content="Test" HorizontalAlignment="Stretch"/&gt; &lt;/StackPanel&gt; &lt;/Window&gt; </code></pre> <p><strong>However</strong>, this stops working as soon as I use my shared resource in a control template:</p> <p>My (extremely simplified, for the purpose of this question) control:</p> <pre><code>using System; using System.Windows; using System.Windows.Controls; namespace AppWideResources { public class MyControl : Control { static MyControl() { DefaultStyleKeyProperty.OverrideMetadata(typeof(MyControl), new FrameworkPropertyMetadata(typeof(MyControl))); } } } </code></pre> <p>... and the corresponding <code>Themes\Generic.xaml</code> file:</p> <pre><code>&lt;ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="clr-namespace:AppWideResources"&gt; &lt;Style TargetType="local:MyControl"&gt; &lt;Setter Property="Template"&gt; &lt;Setter.Value&gt; &lt;ControlTemplate TargetType="local:MyControl"&gt; &lt;StackPanel Orientation="Horizontal"&gt; &lt;Button Style="{StaticResource flatButtonStyle}" Content="1"/&gt; &lt;Button Style="{StaticResource flatButtonStyle}" Content="2"/&gt; &lt;/StackPanel&gt; &lt;/ControlTemplate&gt; &lt;/Setter.Value&gt; &lt;/Setter&gt; &lt;/Style&gt; &lt;/ResourceDictionary&gt; </code></pre> <p>This control is then inserted into my window:</p> <pre><code>&lt;Window x:Class="AppWideResources.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="clr-namespace:AppWideResources" Title="AppWideResources" Height="300" Width="300" &gt; &lt;StackPanel&gt; &lt;Button Style="{StaticResource flatButtonStyle}" Content="Test" HorizontalAlignment="Stretch"/&gt; &lt;local:MyControl/&gt; &lt;/StackPanel&gt; &lt;/Window&gt; </code></pre> <p>If I run this, a <a href="http://msdn.microsoft.com/en-us/library/system.windows.markup.xamlparseexception%28v=vs.110%29.aspx" rel="nofollow noreferrer"><code>XamlParseException</code></a> is thrown, saying that the static resource <code>flatButtonStyle</code> cannot be found.</p> <p>The only workaround I have found is by explicitly merging the common resource dictionary into the local resource dictionary of the control template:</p> <pre><code>&lt;ControlTemplate TargetType="local:MyControl"&gt; &lt;ControlTemplate.Resources&gt; &lt;ResourceDictionary&gt; &lt;ResourceDictionary.MergedDictionaries&gt; &lt;ResourceDictionary Source="/AppWideResources;component/CommonResources.xaml"/&gt; &lt;/ResourceDictionary.MergedDictionaries&gt; &lt;/ResourceDictionary&gt; &lt;/ControlTemplate.Resources&gt; &lt;StackPanel Orientation="Horizontal"&gt; &lt;Button Style="{StaticResource flatButtonStyle}" Content="1"/&gt; &lt;Button Style="{StaticResource flatButtonStyle}" Content="2"/&gt; &lt;/StackPanel&gt; &lt;/ControlTemplate&gt; </code></pre> <p>However, not only is this quite verbose and error-prone with several lines of redundant code (my actual project contains quite a few templated controls, not just one), I am also concerned about wasting system resources by loading the static resources several times (once for every time <code>CommonResources.xaml</code> is included). (Is that concern justified? Or does WPF use the same instances every time when loading a particular resource dictionary?)</p> <p>So, the question is: <strong>What is the proper way to make a WPF resource accessible throughout the whole application, including control templates?</strong></p>
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    1. COIs answer provided not good enough mate?
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      1. POHow to Define Common Resources Across WPF Applications (including templates)?
      1. USRohit Vats
    2. CO@RohitVats: Patience ;-) I've seen your answer and it works, and I'm probably going to accept it; I just tend to leave questions open for another day or so, just in case someone else suggests an even better solution.
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