如何使用MahApps.Metro在所有WPF窗口中应用相同的主题

Question

I'm newer with WPF projects and I have a question about the component MahApps.Metro. I created a MainWindow and other windows in my project, my question is: How to apply the same theme in MainWindow to the others windows of the project? And, I must to apply the ResourceDictionary for all windows or exist any way to do this one time only?

Thank you guys!

Answer 1

In your App.xaml , set the ResourceDictionary property like this:

<Application.Resources>
    <ResourceDictionary Source="MyResourceDictionary.xaml"/>
</Application.Resources>

Notice that in order for the styles in your resource dictionary to be applied to all controls of that type, the style should NOT have a key . For example, a style defined like this:

<Style TargetType="{x:Type Button}">
    <Setter Property="Content" Value="This is the default button text"/>
</Style>

In the ResourceDictionary will cause all the buttons in the project to have a default value when you create them.

Answer 2

Resource's in WPF work based on their available "scope". Check this article for a detailed explanation

Now Application (App.xaml) is in a higher scope to Window . Thus to share these MahApps control resources across your Window 's just move the ResourceDictionary 's to the Application.Resources scope

something like:

<Application.Resources>
  <ResourceDictionary>
    <ResourceDictionary.MergedDictionaries>
      <ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Colours.xaml" />
      <ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Fonts.xaml" />
      <ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Controls.xaml" />
      <ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Accents/Blue.xaml" />
      <ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Accents/BaseLight.xaml" />
    </ResourceDictionary.MergedDictionaries>
  </ResourceDictionary>
</Application.Resources>

Now you no longer need to add these Dictionary's in each Window as they are available implicitly