WPF学习系列028: 3.3.4 附加事件

 

•  
  1. 通过对附加事件的定义，WPF路由事件的管道传递和冒泡，可以通过一个没有定义过该事件的元素来完成。
  1. 每个路由事件都可以被当作附加事件使用

3.3.4  附加事件

例如：

XAML文件

<Window x:Class="WpfApplication1.AboutDialog"

        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

        Title="About WPF Unleashed"

        ListBox.SelectionChanged="ListBox_SelectionChange"

        ButtonBase.Click="Button_Click"

        SizeToContent="WidthAndHeight"

        Background="OrangeRed">

    <StackPanel>

        <Label FontWeight="Bold"

               FontSize="20"

               Foreground="White">

            WPF Unleashed (Version 3.0)

        </Label>

        <Label>

            © 2006 SAMS Publishing

        </Label>

        <Label>

            Installed Chapters:

        </Label>

        <ListBox>

            <ListBoxItem>

                Chapter 1

            </ListBoxItem>

            <ListBoxItem>

                Chapter 2

            </ListBoxItem>

        </ListBox>

        <StackPanel Orientation="Horizontal"

                    HorizontalAlignment="Center">

            <Button MinWidth="75"

                    Margin="10">

                Help

            </Button>

            <Button MinWidth="75"

                    Margin="10">

                OK

            </Button>

        </StackPanel>

        <StatusBar>

            You have successfully registered this product.

        </StatusBar>

    </StackPanel>

</Window>

对应的代码隐藏文件

using System.Windows;

using System.Windows.Controls;

 

namespace WpfApplication1

{

    /// <summary>

    /// MainWindow.xaml 的交互逻辑

    /// </summary>

    public partial class AboutDialog : Window

    {

        public AboutDialog()

        {

            InitializeComponent();

        }

 

        private void ListBox_SelectionChange(object sender, SelectionChangedEventArgs e)

        {

            if (e.AddedItems.Count > 0)

            {

                MessageBox.Show("You just selected " + e.AddedItems[0]);

            }

        }

 

        private void Button_Click(object sender, RoutedEventArgs e)

        {

            MessageBox.Show("You just clicked " + e.Source);

        }

    }

}

注意：由于Window并没有定义它自己的SelectionChanged事件或Click事件，因此事件特性名称必须拥有定义这些事件的类名称作为前缀。