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AutomationPeer.InvalidatePeer Method

Triggers recalculation of the main properties of the AutomationPeer and raises the PropertyChanged notification to the Automation Client if the properties changed.

Namespace:  System.Windows.Automation.Peers
Assembly:  PresentationCore (in PresentationCore.dll)
public void InvalidatePeer()

Examples of main properties include, but are not limited to, LogicalChildren and BoundingRectangle.

Typically, updates and notifications happen automatically after the update of the layout in Windows Presentation Foundation (WPF). (The update occurs in response to the LayoutUpdated event.) Sometimes, however, properties change without raising the LayoutUpdated event. For example, when the whole Window moves, the LayoutUpdated event is not raised. In this example, the set of BoundingRectangle objects change because the objects are expressed in screen coordinates. Therefore, the Window must call InvalidatePeer on its peer on WindowAutomationPeer.

.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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