Notifies listeners of dynamic changes, such as when items get added and removed or the whole list is refreshed.
Assembly: System (in System.dll)
Thetype exposes the following members.
You can enumerate over any collection that implements the IEnumerable interface. However, to set up dynamic bindings so that insertions or deletions in the collection update the UI automatically, the collection must implement the interface. This interface exposes the CollectionChanged event that must be raised whenever the underlying collection changes.
WPF provides the ObservableCollection(Of T) class, which is a built-in implementation of a data collection that exposes the interface. For an example, see How to: Create and Bind to an ObservableCollection.
The individual data objects within the collection must satisfy the requirements described in the Binding Sources Overview.
Before implementing your own collection, consider using ObservableCollection(Of T) or one of the existing collection classes, such as List(Of T), Collection(Of T), and BindingList(Of T), among many others.
If you have an advanced scenario and want to implement your own collection, consider using IList, which provides a non-generic collection of objects that can be individually accessed by index and provides the best performance.
.NET FrameworkSupported in: 4.5, 4, 3.5, 3.0
.NET Framework Client ProfileSupported in: 4, 3.5 SP1
Portable Class LibrarySupported in: Portable Class Library
.NET for Windows Store appsSupported in: Windows 8
.NET for Windows Phone appsSupported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8
Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.