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ButtonBase.OnMouseLeftButtonDown Method

Provides class handling for the MouseLeftButtonDown routed event that occurs when the left mouse button is pressed while the mouse pointer is over this control.

Namespace:  System.Windows.Controls.Primitives
Assembly:  PresentationFramework (in PresentationFramework.dll)

protected override void OnMouseLeftButtonDown(
	MouseButtonEventArgs e
)

Parameters

e
Type: System.Windows.Input.MouseButtonEventArgs
The event data.

This implementation marks the MouseLeftButtonDown event as handled by setting the Handled property of the event data to true when ClickMode is not set to Hover. To respond to the MouseLeftButtonDown event, attach an event handler to the PreviewMouseLeftButtonDown event, or call AddHandler(RoutedEvent, Delegate, Boolean) with handledEventsToo set to true.

When ClickMode is set to Press, this method raises the Click event.

Notes to Inheritors

If you override OnMouseLeftButtonDown, always call the base implementation in your OnMouseLeftButtonDown implementation. Failure to call the base implementation prevents base classes from handling the event with a class handler, which might change the run-time behavior of the final class. You can call the base implementation either before or after your special handling, depending on your requirements.

.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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