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POWindows Phone: how to change the Application style programmatically
 

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  1. POWindows Phone: how to change the Application style programmatically
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    <p>In my Windows Phone 8 app, I have some implicit styles defined in a xaml file at the location <strong>/Styles/DefaultStyles.xaml</strong></p> <p>I have a similar file but with different colors, fonts, etc ... defined at <strong>/Styles/GreenStyles.xaml</strong>.</p> <p>I reference the default style file in my App.xaml as follows :</p> <pre><code>&lt;Application.Resources&gt; &lt;ResourceDictionary&gt; &lt;ResourceDictionary.MergedDictionaries&gt; &lt;ResourceDictionary Source="Styles/DefaultStyles.xaml"/&gt; &lt;/ResourceDictionary.MergedDictionaries&gt; &lt;/ResourceDictionary&gt; &lt;/Application.Resources&gt; </code></pre> <p>I want to make my app switch its implicit styles from the other styles file (GreenStyles) programmatically.</p> <p>How can I achieve this ?</p> <p>**</p> <blockquote> <p><strong>UPDATE:</strong></p> </blockquote> <p>I manged to change the source of the resource dictionary as follows:</p> <pre><code>ResourceDictionary style = App.Current.Resources.MergedDictionaries.ToList()[0]; string source = String.Format("/ApplicationName;component/Styles/GreenStyles.xaml"); style.Source = new Uri(source, UriKind.Relative); </code></pre> <p><strong>Note:</strong> the word component must be written like that to avoid exceptions</p> <p>Now I have an issue: only the <strong>Implicit styles</strong> (the ones that do not have a <strong>x:Key</strong> attribute) are switched when the source of the dictionary changes.</p> <p>any other style with a specified key and defined twice (with different attributes) in both files, will not be reflected in the UI.</p> <p>so if I have these files: <strong>DefaultStyles.xaml:</strong> </p> <pre><code> &lt;Style x:Key="MainGrid" TargetType="Grid"&gt; &lt;Setter Property="Background" Value="Red"/&gt; &lt;/Style&gt; &lt;Style TargetType="TextBlock"&gt; &lt;Setter Property="Foreground" Value="Red"/&gt; &lt;Setter Property="FontSize" Value="24"/&gt; &lt;/Style&gt; &lt;/ResourceDictionary&gt; </code></pre> <p><strong>And: GreenStyles.xaml:</strong></p> <pre><code>&lt;ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"&gt; &lt;Style x:Key="MainGrid" TargetType="Grid"&gt; &lt;Setter Property="Background" Value="Green"/&gt; &lt;/Style&gt; &lt;Style TargetType="TextBlock"&gt; &lt;Setter Property="Foreground" Value="Green"/&gt; &lt;Setter Property="FontSize" Value="24"/&gt; &lt;/Style&gt; &lt;/ResourceDictionary&gt; </code></pre> <p>and I switched the source to point to <strong>GreenStyles.xaml</strong>, any Grid with the style <strong>MainGrid</strong> will still have it's background to <strong>Red</strong>.</p> <p>What can be the reason for this ?</p>
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    1. COCan you give your `ResourceDictionary` an `x:Name` value, and then reference that in your code-behind to change the `Source` property whenever you need?
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    2. COI did that, the theme changed, but there is an issue, please check the update in the question
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    3. COhmm.. does this help? http://stackoverflow.com/questions/2032294/access-resourcedictionary-items-programmatically - I've never done this exactly, but it seems like it might help.
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