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What is ObservableCollection and why use it for lists? How do you bind to nested properties and handle null paths safely? How do you implement input validation with data binding? How do you efficiently update large observable collections? How do you implement grouping in a CollectionView?
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.NET MAUI › Advanced Data Binding & Collections

What is RelativeSource binding and when do you need it?

Intermediate

Answer

RelativeSource binds to something other than BindingContext—Self (the element), an ancestor of a given type, or the templated parent. It's essential inside DataTemplates to reach the parent page's view-model command rather than the item's context.
<Button Text="Delete"
    Command="{Binding Source={RelativeSource
        AncestorType={x:Type ContentPage}},
        Path=BindingContext.DeleteCommand}"
    CommandParameter="{Binding .}" />
Real-world example A delete button inside a list item invokes the page view model's command via AncestorType while passing the item as a parameter.

Common follow-ups: Why is this needed in templates? | What are the RelativeSource modes?

Data Binding & MVVM CollectionView Advanced Data Binding & Collections
All 6 Advanced Data Binding & Collections questions