DependencyPropertyDescriptor.AddValueChanged Method (System.ComponentModel)

AddValueChanged Method

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This page is specific to

Microsoft Visual Studio 2008/.NET Framework 3.5

Other versions are also available for the following:

.NET Framework Class Library

DependencyPropertyDescriptor..::.AddValueChanged Method

Enables other objects to be notified when this property changes.

Namespace: System.ComponentModel
Assembly: WindowsBase (in WindowsBase.dll)

Syntax

Visual Basic (Declaration)

Public Overrides Sub AddValueChanged ( _
    component As Object, _
    handler As EventHandler _
)

Visual Basic (Usage)

Dim instance As DependencyPropertyDescriptor
Dim component As Object
Dim handler As EventHandler

instance.AddValueChanged(component, handler)

public override void AddValueChanged(
    Object component,
    EventHandler handler
)

Visual C++

public:
virtual void AddValueChanged(
    Object^ component, 
    EventHandler^ handler
) override

JScript

public override function AddValueChanged(
    component : Object, 
    handler : EventHandler
)

XAML

You cannot use methods in XAML.

Parameters

component: Type: System..::.Object
The component to add the handler for.

handler: Type: System..::.EventHandler
The delegate to add as a listener.

Platforms

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

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

Version Information

.NET Framework

Supported in: 3.5, 3.0

Reference

DependencyPropertyDescriptor Class

DependencyPropertyDescriptor Members

System.ComponentModel Namespace

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Annotations

DependencyPropertyDescriptor.AddValueChanged roots your component for GC! (object leak)

Paul Meyer | Edit | Show History

Beware that this method will ultimately store a reference to 'component' as a key in a static hashtable. This will root your component and it will never be garbage collected, unless you call RemoveValueChanged when you are done.

Consider implementing (and using) IDisposable or using a weak reference method, such as data binding through a Binding object. Also see http://agsmith.wordpress.com/2008/04/07/propertydescriptor-addvaluechanged-alternative/ for a discussion.