ObservableCollection
Explore how ObservableCollection<T> supports dynamic data handling in C#. Learn to use its CollectionChanged event to keep user interfaces in sync with collection changes, and understand methods like Add, RemoveAt, and Insert. This lesson helps you apply observable collections for responsive app development.
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Consider a note management application where adding or deleting entries must trigger an immediate user interface refresh. While a standard List<T> stores data efficiently, it does not inform other parts of the program when its contents change.
A good approach to solve this is using events. The ObservableCollection<T> class is a specialized collection that exposes the CollectionChanged event. We can subscribe to this event to ensure the UI or other logic updates automatically whenever the collection state changes.
Note: The CollectionChanged event also triggers when the entire collection is replaced or when an existing item is swapped for a different one.
Syntax and usage
We instantiate and use ObservableCollection<T> using syntax similar to a standard list. The class ...