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INotifyCollectionChanged Interface

Notifies listeners of dynamic changes, such as when items get added and removed or the whole list is refreshed.

Namespace:  System.Collections.Specialized
Assembly:  System (in System.dll)

type INotifyCollectionChanged =  interface end

The INotifyCollectionChanged type exposes the following members.

  NameDescription
Public eventCollectionChangedOccurs when the collection changes.
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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 INotifyCollectionChanged interface. This interface exposes the CollectionChanged event that must be raised whenever the underlying collection changes.

WPF provides the ObservableCollection(T) class, which is a built-in implementation of a data collection that exposes the INotifyCollectionChanged 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(T) or one of the existing collection classes, such as List(T), Collection(T), and BindingList(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 Framework

Supported in: 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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