Question

我有一个带有依赖项属性的用户控件。当该属性发生更改时，我想将RoutedEvent级联到主应用程序并执行某些功能。这是我的用户控制代码：

    public TCardBase SelectedTCard
    {
        get { return (TCardBase)GetValue(SelectedTCardProperty); }
        set { SetValue(SelectedTCardProperty, value); }
    }

    // Using a DependencyProperty as the backing store for SelectedTCard.  This enables animation, styling, binding, etc...
    public static readonly DependencyProperty SelectedTCardProperty =
        DependencyProperty.Register("SelectedTCard", typeof(TCardBase), typeof(TCardView), new PropertyMetadata(SelectedTCardPropertyChanged));


    private static void SelectedTCardPropertyChanged(DependencyObject o, DependencyPropertyChangedEventArgs e)
    {
       //SEND EVENT HERE TO MAIN APPLICATION
    }

将此活动发送到主应用程序的最佳方式是什么？感谢。

Answer 1

网上有很多很好的例子如何创建自定义路由事件。

看看这段代码：

// This event uses the bubbling routing strategy 
public static readonly RoutedEvent TapEvent = EventManager.RegisterRoutedEvent(
    "Tap", RoutingStrategy.Bubble, typeof(RoutedEventHandler), typeof(TCardView));

// Provide CLR accessors for the event 
public event RoutedEventHandler Tap
{
        add { AddHandler(TapEvent, value); } 
        remove { RemoveHandler(TapEvent, value); }
}

// This method raises the Tap event 
void RaiseTapEvent()
{
        RoutedEventArgs newEventArgs = new RoutedEventArgs(TCardView.TapEvent);
        RaiseEvent(newEventArgs);
}

public TCardBase SelectedTCard
{
    get { return (TCardBase)GetValue(SelectedTCardProperty); }
    set { SetValue(SelectedTCardProperty, value); }
}

// Using a DependencyProperty as the backing store for SelectedTCard.  This enables animation, styling, binding, etc...
public static readonly DependencyProperty SelectedTCardProperty =
    DependencyProperty.Register("SelectedTCard", typeof(TCardBase), typeof(TCardView), new PropertyMetadata(SelectedTCardPropertyChanged));


private static void SelectedTCardPropertyChanged(DependencyObject o, DependencyPropertyChangedEventArgs e)
{
    ((TCardView)o).RaiseTapEvent();
}

试一试。：）

路由事件和从属属性

1 个答案: