Question

我的UserControl中有一个简单的TabControl，它嵌入在父控件中，如下所示：

 <StackPanel>       
        <myviews:myusercontrol></myviews:myusercontrol>                      
    </StackPanel>

在myusercontrol中，我有以下实现：

  public partial class MyUserControl
    {
        public delegate void SelectedTabItemHandler(string selectedTabItem);
        public event SelectedTabItemHandler TabItemSelected;

        public MyUserControl()
        {
            InitializeComponent();
        }     

        private void TabControl_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            if(TabItemSelected != null)
            {
                TabItemSelected("some selected Item");
            }
        }
    }

如何在我的XAML中连接TabItemSelected事件，如下所示：

<myviews:myusercontrol TabItemSelected="TabSelectionChanged"></myviews:myusercontrol>

更新2：

为了传递自定义参数，我正在做这样的事情：

 public partial class PatientEditTabView : UserControl
    {       
        // Routed Event 
        public static readonly RoutedEvent SelectedTabItemEvent = EventManager.RegisterRoutedEvent("TabItemSelected", RoutingStrategy.Bubble, typeof(RoutedEventHandler), typeof(PatientEditTabView));

        public PatientEditTabView()
        {
            InitializeComponent();
        }     

        public event RoutedEventHandler TabItemSelected
        {
            add { AddHandler(SelectedTabItemEvent, value);  }
            remove { RemoveHandler(SelectedTabItemEvent, value); }
        }

        private void TabControl_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            SelectedTabRoutedEventArgs eventArgs = new SelectedTabRoutedEventArgs(PatientEditTabView.SelectedTabItemEvent,tabControl.SelectedValue as String);
            RaiseEvent(eventArgs);
        }
    }

更新3：

 public class SelectedTabRoutedEventArgs : RoutedEventArgs
    {
        private readonly String _selectedItem; 

        public SelectedTabRoutedEventArgs(RoutedEvent routedEvent,string selectedItem)
            : base(routedEvent)
        {
            _selectedItem = selectedItem; 
        }

       public string SelectedItem
        {
            get { return _selectedItem; }
        }
    }

Answer 1

如果您想从XAML挂钩处理程序，则需要创建 custom Routed event 。

请参阅此处的文章 - How to create custom routed event.

public partial class MyUserControl
{
    public static readonly RoutedEvent TabItemSelectedEvent = 
        EventManager.RegisterRoutedEvent("TabItemSelected",
                     RoutingStrategy.Bubble, typeof(RoutedEventHandler), 
                     typeof(MyUserControl));

    public event RoutedEventHandler TabItemSelected
    {
        add { AddHandler(TabItemSelectedEvent, value); } 
        remove { RemoveHandler(TabItemSelectedEvent, value); }
    }

    void RaiseTabItemSelectedEvent()
    {
        RoutedEventArgs newEventArgs =
                new RoutedEventArgs(MyUserControl.TabItemSelectedEvent);
        RaiseEvent(newEventArgs);
    }

    private void TabControl_SelectionChanged(object sender,
                                             SelectionChangedEventArgs e)
    {
        RaiseTabItemSelectedEvent();
    }    
}

注意：您需要创建从RoutedEventArgs派生的类，以防您希望在您的案例中传递一些自定义数据（如字符串）并在提升时传递自定义事件参数事件

<强>更新：

就像我说的，你必须从RoutedEventArgs创建派生类，以防想要传递字符串值。这就是它的方式：

public class SelectedTabRoutedEventArgs : RoutedEventArgs
{
    private readonly string selectedItem;

    public SelectedTabRoutedEventArgs(RoutedEvent routedEvent,
                                      string selectedItem)
        :base(routedEvent)
    {
        this.selectedItem = selectedItem;
    }

    public string SelectedItem
    {
        get
        {
            return selectedItem;
        }
    }
}

并更新其他方法：

void RaiseTabItemSelectedEvent(string selectedItem)
{
    SelectedTabRoutedEventArgs newEventArgs =
          new SelectedTabRoutedEventArgs(SampleUserControl.TabItemSelectedEvent, 
                                         selectedItem);
    RaiseEvent(newEventArgs);
}

private void TabControl_SelectionChanged(object sender,
                                            SelectionChangedEventArgs e)
{
    RaiseTabItemSelectedEvent(tabControl.SelectedValue.ToString());
}

此外，您在窗口中的目标事件处理程序将如下所示：

private void TabSelectionChanged(object sender, RoutedEventArgs e)
{
    SelectedTabRoutedEventArgs args = (SelectedTabRoutedEventArgs)e;
    string selectedItem = args.SelectedItem;
}

从WPF中的用户控件到父控件的自定义事件

1 个答案: