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UIElement.MouseLeave Event

Occurs when the mouse pointer leaves the bounds of this element.

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

public event MouseEventHandler MouseLeave
<object MouseLeave="MouseEventHandler" .../>



Identifier field


Routing strategy




  • Override OnMouseLeave to implement class handling for this event in derived classes.

MouseLeave 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 MouseLeave tracks when the mouse leaves an element, this event more literally reports that the IsMouseOver property value has changed from true to false on this element.

This event creates an alias for the Mouse.MouseLeave attached event for this class, so that MouseLeave is part of the class members list when UIElement is inherited as a base element. Event handlers that are attached to the MouseLeave event are attached to the underlying Mouse.MouseLeave 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.


This example demonstrates how to use events, but the recommended way to achieve this same effect is to use a Trigger in a style. For more information, see Styling and Templating.

The following XAML creates the user interface, which consists of Border around a TextBlock, and attaches the MouseEnter and MouseLeave event handlers to the Border.

  <Border MouseEnter="OnMouseEnterHandler"
          Name="border1" Margin="10"
          Width="300" Height="100">
    <Label Margin="10" FontSize="14"
           HorizontalAlignment="Center">Move Cursor Over Me</Label>

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.

public partial class Window1 : Window
    public Window1()

    // raised when mouse cursor enters the area occupied by the element
    void OnMouseEnterHandler(object sender, MouseEventArgs e)
        border1.Background = Brushes.Red;

    // raised when mouse cursor leaves the area occupied by the element
    void OnMouseLeaveHandler(object sender, MouseEventArgs e)
        border1.Background = Brushes.White;

.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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