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Mouse.PreviewMouseUp Attached Event

Occurs when any mouse button is released.

Namespace: System.Windows.Input
Assembly: PresentationCore (in PresentationCore.dll)
XML Namespace:

See Mouse.AddPreviewMouseUpHandler, Mouse.RemovePreviewMouseUpHandler
See Mouse.AddPreviewMouseUpHandler, Mouse.RemovePreviewMouseUpHandler
See Mouse.AddPreviewMouseUpHandler, Mouse.RemovePreviewMouseUpHandler
<object Mouse.PreviewMouseUp="MouseButtonEventHandler" .../>

Which mouse button was released is determined by checking the arguments of the event.

This is an attached event (using tunneling routing strategy) that is intended through attached event syntax to be referenced by existing user interface (UI) elements that take input.

The Windows Presentation Foundation (WPF) framework builds on this attached event by surfacing it as two different common language runtime (CLR) events on UIElement: PreviewMouseLeftButtonUp and PreviewMouseRightButtonUp. These implementations handle the underlying PreviewMouseUp event and read the arguments of the event to determine whether the left or right mouse button was involved. For three-button, there is no framework-level event support for the center button, and you should use the PreviewMouseUp event and check for the center button condition in the event arguments.

For routed events that relate to the mouse, be careful about how or when you mark them handled. Handling the event near the root and not handling by a child further toward the source may not be appropriate for composited controls, where the compositing pieces might have expected mouse behaviors. The difficulty in making the appropriate choices about whether other elements should also be informed about any given mouse action is in fact why the WPF framework chose the model of having the underlying Mouse routed event be surfaced as CLR events along the route.

Routed Event Information

Identifier field


Routing strategy




  • The corresponding bubbling event is MouseUp.

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.