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 Events Overview 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 ContentElement 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.
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.
<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 MouseEnter 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.
Partial Public Class Window1 Inherits Window Public Sub New() InitializeComponent() End Sub ' raised when mouse cursor enters the are occupied by the element Private Sub OnMouseEnterHandler(ByVal sender As Object, ByVal e As MouseEventArgs) border1.Background = Brushes.Red End Sub ' raised when mouse cursor leaves the are occupied by the element Private Sub OnMouseLeaveHandler(ByVal sender As Object, ByVal e As MouseEventArgs) border1.Background = Brushes.White End Sub End Class
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.