12

我有以下课程，并希望将文本变量作为 RoutedEventArgs 传递。

  public class CloseableTabItem : TabItem
  {
    String text;

    public CloseableTabItem()
    {
      //This style is defined in themes\generic.xaml
      DefaultStyleKeyProperty.OverrideMetadata(typeof(CloseableTabItem),
          new FrameworkPropertyMetadata(typeof(CloseableTabItem)));
    }

    public CloseableTabItem(String incomingText)
    {
      //This style is defined in themes\generic.xaml
      DefaultStyleKeyProperty.OverrideMetadata(typeof(CloseableTabItem),
          new FrameworkPropertyMetadata(typeof(CloseableTabItem)));
      text = incomingText;
    }

    public static readonly RoutedEvent CloseTabEvent =
        EventManager.RegisterRoutedEvent("CloseTab", RoutingStrategy.Bubble,
            typeof(RoutedEventHandler), typeof(CloseableTabItem));

    public event RoutedEventHandler CloseTab
    {
      add { AddHandler(CloseTabEvent, value); }
      remove { RemoveHandler(CloseTabEvent, value); }
    }

    public override void OnApplyTemplate()
    {
      base.OnApplyTemplate();

      Button closeButton = base.GetTemplateChild("PART_Close") as Button;
      if (closeButton != null)
        closeButton.Click += new System.Windows.RoutedEventHandler(closeButton_Click);
    }

    void closeButton_Click(object sender, System.Windows.RoutedEventArgs e)
    {
      this.RaiseEvent(new RoutedEventArgs(CloseTabEvent, this));
    }
  }

这是来自 Window1 的代码，它是 WPF 应用程序中的主类

  public partial class Window1 : Window
  {
    public static Window1 myWindow1;

    public Window1()
    {
      myWindow1 = this;
      InitializeComponent();
      this.AddHandler(CloseableTabItem.CloseTabEvent, new RoutedEventHandler(this.CloseTab));
    }

    private void CloseTab(object source, RoutedEventArgs args)
    {
      TabItem tabItem = args.Source as TabItem;
      if (tabItem != null)
      {
        TabControl tabControl = tabItem.Parent as TabControl;
        if (tabControl != null)
          tabControl.Items.Remove(tabItem);
      }
    }

    private void btnAdd_Click(object sender, RoutedEventArgs e)
    {
      CloseableTabItem tabItem = new CloseableTabItem("THIS IS A TEST");
      MainTab.Items.Add(tabItem);
    }
  }

我希望能够在 CloseTab 方法中打印“字符串文本”的值。如何使用 RoutedEventArgs 参数传递“字符串文本”？

此致！

编辑

我对项目进行了一些更改，这是代码

ClosableTabItem.cs

namespace SampleTabControl
{
  public class CloseableTabItem : TabItem
  {

    String text;
    public delegate void TabsEventHandler(object sender, TabsEventArgs e);

    public CloseableTabItem()
    {
      //This style is defined in themes\generic.xaml
      DefaultStyleKeyProperty.OverrideMetadata(typeof(CloseableTabItem),
          new FrameworkPropertyMetadata(typeof(CloseableTabItem)));
    }

    public CloseableTabItem(String incomingText)
    {
      //This style is defined in themes\generic.xaml
      DefaultStyleKeyProperty.OverrideMetadata(typeof(CloseableTabItem),
          new FrameworkPropertyMetadata(typeof(CloseableTabItem)));
      this.text = incomingText;
    }

    public static readonly RoutedEvent CloseTabsEvent = EventManager.RegisterRoutedEvent("CloseTab", RoutingStrategy.Bubble, typeof(TabsEventHandler), typeof(CloseableTabItem));    

    public event TabsEventHandler CloseTab
    {
      add { AddHandler(CloseTabsEvent, value); }
      remove { RemoveHandler(CloseTabsEvent, value); }
    }


    public override void OnApplyTemplate()
    {
      base.OnApplyTemplate();

      Button closeButton = base.GetTemplateChild("PART_Close") as Button;
      if (closeButton != null)
        closeButton.Click += new System.Windows.RoutedEventHandler(closeButton_Click);
    }

    void closeButton_Click(object sender, System.Windows.RoutedEventArgs e)
    {
      TabsEventArgs args = new TabsEventArgs(CloseTabsEvent, text);
      RaiseEvent(args);
    }
  }
}

TabsEventArgs.cs

public class TabsEventArgs : RoutedEventArgs
{
    private readonly string text;

    public string Text
    {
        get { return text; }
    }

    public TabsEventArgs(RoutedEvent routedEvent, string text) : base(routedEvent)
    {
        this.text = text;
    }
}

窗口1.cs

  public partial class Window1 : Window
  {
    public static Window1 myWindow1;

    public Window1()
    {
      myWindow1 = this;
      InitializeComponent();
      this.AddHandler(CloseableTabItem.CloseTabsEvent, new RoutedEventHandler(this.CloseTab));
    }

    private void CloseTab(object source, RoutedEventArgs args)
    {      
      TabItem tabItem = args.Source as TabItem;
      if (tabItem != null)
      {
        TabControl tabControl = tabItem.Parent as TabControl;
        if (tabControl != null)
          tabControl.Items.Remove(tabItem);
      }
    }

    private void btnAdd_Click(object sender, RoutedEventArgs e)
    {
      CloseableTabItem tabItem = new CloseableTabItem("THIS IS A TEST");
      MainTab.Items.Add(tabItem);
    }
  }

进行更改后（当我打开多个选项卡时应用程序崩溃），您将如何访问 Window1 类的 CloseTab 方法中的“字符串文本”？

4

3 回答 3

14

我需要类似的东西，在@Arya 和@HB 的帮助下，我想出了这个：

我的自定义 RoutedEventArgs 子类

public class ChangePageEventArgs : RoutedEventArgs {
    private readonly int _pageNumber;

    public int PageNumber {
        get { return _pageNumber; }
    }

    public ChangePageEventArgs(RoutedEvent routedEvent, int pageNumber) : base(routedEvent) {
        this._pageNumber = pageNumber;
    }
}

我的孩子班

private void defineButton_Click(object sender, RoutedEventArgs e) {
    ChangePageItemList(2);
}

public static readonly RoutedEvent GoToItemPropertiesViewEvent = EventManager.RegisterRoutedEvent(
"GoToItemPropertiesView", RoutingStrategy.Bubble, typeof(RoutedEventHandler), typeof(NoObjectView));

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

public void ChangePageItemList(int _pageNumber) {
    ChangePageEventArgs args = new ChangePageEventArgs(GoToItemPropertiesViewEvent, _pageNumber);
    this.RaiseEvent(args);
}

我的家长班

private ItemListView createItemListView() {
    _itemListView = new ItemListView();
    _itemListView.GoToItemPropertiesView += new RoutedEventHandler(ChangePage);

    return _itemListView;
}

private void ChangePage(object sender, RoutedEventArgs e) {
    ChangePageEventArgs args = (ChangePageEventArgs)e;
    // Value of page number is 2
    int _pageNumber = args.PageNumber;
}

希望它可以帮助你@Arya

于 2013-05-13T17:21:51.317 回答
13

创建一个新的子类RoutedEventArgs，向它添加一个属性，您可以在其中存储要传递的变量并创建一个相应的处理程序委托类型void (object, YourNewEventArgs)，然后您将其分配为事件的处理程序类型（当前使用法线RoutedEventHandler，因此仅提供法线RoutedEventArgs）。

如果要引发事件，则需要创建新的事件参数并将变量传递给该变量的属性。如何在处理程序中获取值应该是不言自明的。

于 2011-11-13T03:51:48.163 回答
0

1 - 创建一个新的事件数据类：

public class SelectedRowEventArgs : RoutedEventArgs
{
    public int Value { get; set; }

    public SelectedRowEventArgs(RoutedEvent routedEvent, int value) : base(routedEvent)
    {
        this.Value = value;
    }
}

2 - 在用户控件中创建链接代码：

public partial class AusenciasBaseAdmin : UserControl
{

    public static readonly RoutedEvent RowChangedEvent = EventManager.RegisterRoutedEvent("RowChanged", RoutingStrategy.Bubble, typeof(RoutedEventHandler), typeof(AusenciasBaseAdmin));

    public event RoutedEventHandler RowChanged
    {
        add { AddHandler(RowChangedEvent, value); } remove { RemoveHandler(RowChangedEvent, value); }
    }



    public AusenciasBaseAdmin()
    {
        InitializeComponent();
    }


    private void RegAusencias_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        this.RaiseEvent(new SelectedRowEventArgs(RowChangedEvent, 1));
    }
}

3 - 以主窗体链接用户控件：

<control:AusenciasBaseAdmin Grid.Row="0" Grid.Column="0"
                        x:Name="GridAusencias" 
                        RowChanged="GridAusencias_RowChanged_1"
                        />

4 - 主要形式的代码后面： 

    private void GridAusencias_RowChanged_1(object sender, RoutedEventArgs e)
    {
        SelectedRowEventArgs t = (SelectedRowEventArgs)e;

        MessageBox.Show(t.Value.ToString());
    }

祝贺 WPF 团队。您已经完成了非常复杂的工作

于 2019-07-10T10:42:49.643 回答