怎么样在 x:Class中创建Event Handlers

核心提示： To change the XAML and the 托管 code Edit Page1.xaml. After the first Canvas "button", insert another similar button that does not have a

To change the XAML and the 托管 code

Edit Page1.xaml. After the first Canvas "button", insert another similar button that does not have a XAML event handler in it.

CS

<Canvas x:Name="Button2" Canvas.Top="50" Width="100" Height="30" Background="Gray">
　<TextBlock>Click me too</TextBlock>
</Canvas>

VB

<Canvas x:Name="Button2" Canvas.Top="50" Width="100" Height="30" Background="Gray">
　<TextBlock>Click Me Too</TextBlock>
</Canvas>

Edit Page1.xaml.vb. Add another handler that does essentially the same thing as the first one. This time, use Handles to assign the handler to the specific MouseLeftButtonUp event on the Button2 instance.

VB

Private Sub Button2_MouseLeftButtonUp(ByVal sender As Object, ByVal e As System.Windows.Input.MouseEventArgs) Handles Button2.MouseLeftButtonUp
　　Dim redBrush As New SolidColorBrush
　　redBrush.Color = Colors.Red
　　Me.Button2.Background = redBrush
　　Dim tb As TextBlock = Me.Button2.Children(0)
　　tb.Text = "Clicked..."
End Sub

note

If you give the first button the x:Name聽Button1, and the handler implementations are identical in signature as well as in function, you can designate more than one instance to be handled by the same handler, for example: 鈥?Handles Button1.MouseLeftButtonUp, Button2.MouseLeftButtonUp. If you do this, you will also want to remove the MouseLeftButtonUp event attribute from Button1, because now you are declaring the handling in code.