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If Resources dictionary is not observable, how does DynamicResource reference work? Do the Add / Remove methods of the resource dictionary have internal code that kind of "polls" all DynamicResource references and refreshes them when they are removed or added?
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A resource dictionary is a repository for XAML resources, such as styles, that your app uses. You define the resources in XAML and can then retrieve them in XAML using the {StaticResource} markup extension and {ThemeResource} markup extension s. You can also access resources with code, but that is less common.
To add more than one dictionary, just add a <ResourceDictionary Source="Dictionary2. xaml"/> entry after the first entry.
A StaticResource will be resolved and assigned to the property during the loading of the XAML which occurs before the application is actually run. It will only be assigned once and any changes to resource dictionary ignored.
Each ResourceDictionary contains three list of owners. One for FrameworkElement, one for Application and another one for FrameworkContentElement. When you access the Resources property the owner is being set. Also each ResourceDictionary propagates its owner to merged dictionaries. When dictionary is changing, it notifies owners about it. This notification actually searches dependency properties with local values containing resource expression. Then each expression is forced to reevaluate.
All of this code is internal.
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