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What is a ResourceDictionary and how do you use it? What is the difference between an implicit and an explicit Style? How do you merge and organize multiple ResourceDictionaries? What is the VisualStateManager and how do you use it? What are Triggers in MAUI and what types exist?
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.NET MAUI › Styling, Resources & Themes

What is BasedOn style inheritance and when is it useful?

Intermediate

Answer

BasedOn lets a Style inherit setters from another keyed Style, overriding or adding a few. It reduces duplication when you have variants of a base look (e.g., a base button plus primary/secondary variants). The base style must be keyed and in scope.
<Style x:Key="BaseButton" TargetType="Button">
    <Setter Property="CornerRadius" Value="8" />
</Style>
<Style x:Key="Primary" TargetType="Button"
       BasedOn="{StaticResource BaseButton}">
    <Setter Property="BackgroundColor" Value="{StaticResource Primary}" />
</Style>
Real-world example Primary and secondary buttons share corner radius and padding from a base style, differing only in color.

Common follow-ups: Must the base style be keyed? | How does this reduce duplication?

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All 6 Styling, Resources & Themes questions