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What is ObservableCollection and why use it for lists? What is RelativeSource binding and when do you need it? 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

How do you bind to nested properties and handle null paths safely?

Intermediate

Answer

Use dot paths like {Binding Order.Customer.Name}. If intermediate values can be null, bindings resolve to empty rather than throwing, but you can supply FallbackValue and TargetNullValue for clarity. Compiled bindings (x:DataType) validate the path at build time.
<Label Text="{Binding Order.Customer.Name,
    TargetNullValue='Unknown', FallbackValue='—'}" />
Real-world example A summary label shows 'Unknown' when a customer isn't loaded yet, avoiding a blank UI.

Common follow-ups: What is FallbackValue vs TargetNullValue? | Do null paths throw?

Data Binding & MVVM Advanced Data Binding & Collections XAML & UI Layouts
All 6 Advanced Data Binding & Collections questions