此示例演示如何在鼠标指针在屏幕上移动时更改对象的尺寸。
该示例包括一个可扩展应用程序标记语言（XAML）文件，该文件创建用户界面（UI）和创建事件处理程序的代码隐藏文件。
示例：
以下 XAML 创建了 UI，它由 Ellipse 内的 StackPanel 组成，并附加了 MouseMove 事件的事件处理程序。
<Window x:Class="WCSamples.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="mouseMoveWithPointer"
Height="400"
Width="500"
>
<Canvas MouseMove="MouseMoveHandler"
Background="LemonChiffon">
<Ellipse Name="ellipse" Fill="LightBlue"
Width="100" Height="100"/>
</Canvas>
</Window>
后面的代码创建了 MouseMove 事件处理程序。 鼠标指针移动时，Ellipse 的高度和宽度将增加和减少。
// raised when the mouse pointer moves.
// Expands the dimensions of an Ellipse when the mouse moves.
private void MouseMoveHandler(object sender, MouseEventArgs e)
{
// Get the x and y coordinates of the mouse pointer.
System.Windows.Point position = e.GetPosition(this);
double pX = position.X;
double pY = position.Y;
// Sets the Height/Width of the circle to the mouse coordinates.
ellipse.Width = pX;
ellipse.Height = pY;
}
' raised when the mouse pointer moves.
' Expands the dimensions of an Ellipse when the mouse moves.
Private Sub OnMouseMoveHandler(ByVal sender As Object, ByVal e As MouseEventArgs)
'Get the x and y coordinates of the mouse pointer.
Dim position As System.Windows.Point
position = e.GetPosition(Me)
Dim pX As Double
pX = position.X
Dim pY As Double
pY = position.Y
'Set the Height and Width of the Ellipse to the mouse coordinates.
ellipse1.Height = pY
ellipse1.Width = pX
End Sub
