Occurs when the mouse pointer enters the bounds of this element.
Assembly: PresentationCore (in PresentationCore.dll)
XMLNS for XAML: http://schemas.microsoft.com/winfx/2006/xaml/presentation, http://schemas.microsoft.com/netfx/2007/xaml/presentation
is a routed event that uses the direct event handling routing strategy. Direct routed events are not raised along a route; instead, they are handled in the same element where they are raised. However, they do enable other aspects of routed event behavior, such as event triggers in styles.
Although tracks when the mouse pointer enters the bounds of an element, this event more literally reports that the IsMouseOver property value has changed from false to true on this element.
This event creates an alias for the Mouse.MouseEnter attached event for this class, so that is part of the class members list when UIElement is inherited as a base element. Event handlers that are attached to the event are attached to the underlying Mouse.MouseEnter attached event and receive the same event data instance.
A Button (or any ButtonBase derived class) has native handling for a KeyDown event when the button has focus, and the pressed key is the space bar. The native handling raises the Click event with the button as the source, and also captures the mouse, even though the mouse pointer does not appear to move. As a result of the mouse capture, a event is also raised with the button as the source. In general, if an element captures the mouse, then is raised, as well as GotMouseCapture and possibly other control-specific events.
This example shows how to change the color of an element as the mouse pointer enters and leaves the area occupied by the element.
This example consists of a Extensible Application Markup Language (XAML) file and a code-behind file. For the complete samples, see Mouse Pointer Sample.
<StackPanel> <Border MouseEnter="OnMouseEnterHandler" MouseLeave="OnMouseLeaveHandler" Name="border1" Margin="10" BorderThickness="1" BorderBrush="Black" VerticalAlignment="Center" Width="300" Height="100"> <Label Margin="10" FontSize="14" HorizontalAlignment="Center">Move Cursor Over Me</Label> </Border> </StackPanel>
The following code behind creates the and MouseLeave event handlers. When the mouse pointer enters the Border, the background of the Border is changed to red. When the mouse pointer leaves the Border, the background of the Border is changed back to white.
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.