Question

在WPF中，是否有可用于确定TabControl所选标签何时更改的事件？

我尝试过使用TabControl.SelectionChanged，但是当标签中的孩子选择发生变化时，它会被多次触发。

Answer 1

我将其绑定在处理程序中以使其正常工作：

void TabControl_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
    if (e.Source is TabControl)
    {
      //do work when tab is changed
    }
}

Answer 2

如果您将x:Name属性设置为每个TabItem：

<TabControl x:Name="MyTab" SelectionChanged="TabControl_SelectionChanged">
    <TabItem x:Name="MyTabItem1" Header="One"/>
    <TabItem x:Name="MyTabItem2" Header="2"/>
    <TabItem x:Name="MyTabItem3" Header="Three"/>
</TabControl>

然后您可以在活动中访问每个TabItem：

private void TabControl_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
    if (MyTabItem1.IsSelected)
    // do your stuff
    if (MyTabItem2.IsSelected)
    // do your stuff
    if (MyTabItem3.IsSelected)
    // do your stuff
}

Answer 3

如果您只想在选择标签时发生事件，这是正确的方法：

<TabControl>
    <TabItem Selector.Selected="OnTabSelected" />
    <TabItem Selector.Selected="OnTabSelected" />
    <TabItem Selector.Selected="OnTabSelected" />
    <!-- You can also catch the unselected event -->
    <TabItem Selector.Unselected="OnTabUnSelected" />
</TabControl>

并在您的代码中

    private void OnTabSelected(object sender, RoutedEventArgs e)
    {
        var tab = sender as TabItem;
        if (tab != null)
        {
            // this tab is selected!
        }
    }

Answer 4

您仍然可以使用该活动。只需检查sender参数是否是您真正关心的控件，如果是，请运行事件代码。

Answer 5

生成的事件正在冒泡，直到处理完毕。

当ui_Tab_Changed中选择的项目发生变化时，ui_A_Changed下方的xaml部分会在ListView之后触发TabItem，而不管TabControl中的<TabControl SelectionChanged="ui_Tab_Changed"> <TabItem> <ListView SelectionChanged="ui_A_Changed" /> </TabItem> <TabItem> <ListView SelectionChanged="ui_B_Changed" /> </TabItem> </TabControl>更改。

ui_A_Changed

我们需要在ui_B_Changed（以及private void ui_A_Changed(object sender, SelectionChangedEventArgs e) { // do what you need to do ... // then consume the event e.Handled = true; }中使用该事件，等等）：

{{1}}

Answer 6

这是正确的事件。也许它没有正确连线？

<TabControl SelectionChanged="TabControl_SelectionChanged">
    <TabItem Header="One"/>
    <TabItem Header="2"/>
    <TabItem Header="Three"/>
</TabControl>

在代码隐藏......

private void TabControl_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
    int i = 34;
}

如果我在i = 34行上设置一个断点，它只会在我更改标签时中断，即使标签包含子元素并且其中一个被选中。

Answer 7

此代码似乎有效：

    private void TabControl_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        TabItem selectedTab = e.AddedItems[0] as TabItem;  // Gets selected tab

        if (selectedTab.Name == "Tab1")
        {
            // Do work Tab1
        }
        else if (selectedTab.Name == "Tab2")
        {
            // Do work Tab2
        }
    }

Answer 8

如果您正在使用MVVM模式，那么使用事件处理程序会带来不便（并打破模式）。相反，您可以将每个TabItem的Selector.IsSelected属性绑定到viewmodel中的依赖项属性，然后处理PropertyChanged事件处理程序。这样您就可以确切地知道基于PropertyName选择/取消选择哪个选项卡，并且每个选项卡都有一个特殊的处理程序。

示例：MainView.xaml

<TabControl>
 <TabItem Header="My tab 1" Selector.IsSelected="{Binding IsMyTab1Selected}"> ... </TabItem>
 <TabItem Header="My tab 2" Selector.IsSelected="{Binding IsMyTab2Selected}"> ... </TabItem>
</TabControl>

示例：MainViewModel.cs

public bool IsMyTab1Selected {
 get { return (bool)GetValue(IsMyTab1SelectedProperty); }
 set { SetValue(IsMyTab1SelectedProperty, value); }
}
public static readonly DependencyProperty IsMyTab1SelectedProperty =
DependencyProperty.Register("IsMyTab1Selected", typeof(bool), typeof(MainViewModel), new PropertyMetadata(true, new PropertyChangedCallback(MyPropertyChanged)));

public bool IsMyTab2Selected {
 get { return (bool)GetValue(IsMyTab2SelectedProperty); }
 set { SetValue(IsMyTab2SelectedProperty, value); }
}
public static readonly DependencyProperty IsMyTab2SelectedProperty =
DependencyProperty.Register("IsMyTab2Selected", typeof(bool), typeof(MainViewModel), new PropertyMetadata(false, new PropertyChangedCallback(MyPropertyChanged)));

private void MyPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) {
 if (e.Property.Name == "IsMyTab1Selected") {
  // stuff to do
 } else if (e.Property.Name == "IsMyTab2Selected") {
  // stuff to do
 }
}

如果您的MainViewModel为INotifyPropertyChanged而不是DependencyObject，请改用：

示例：MainViewModel.cs

public event PropertyChangedEventHandler PropertyChanged;
protected virtual void OnPropertyChanged(string propertyName) {
 PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}

public MainViewModel() {
 PropertyChanged += handlePropertyChanged;
}

public bool IsMyTab1Selected {
 get { return _IsMyTab1Selected ; }
 set {
  if (value != _IsMyTab1Selected ) {
   _IsMyTab1Selected = value;
   OnPropertyChanged("IsMyTab1Selected ");
  }
 }
}
private bool _IsMyTab1Selected = false;

public bool IsMyTab2Selected {
 get { return _IsMyTab2Selected ; }
 set {
  if (value != _IsMyTab2Selected ) {
   _IsMyTab2Selected = value;
   OnPropertyChanged("IsMyTab2Selected ");
  }
 }
}
private bool _IsMyTab2Selected = false;

private void handlePropertyChanged(object sender, PropertyChangedEventArgs e) {
 if (e.PropertyName == "IsMyTab1Selected") {
  // stuff to do
 } else if (e.PropertyName == "IsMyTab2Selected") {
  // stuff to do
 }
}

Answer 9

如果有人使用WPF Modern UI，他们就无法使用OnTabSelected事件。但是他们可以使用SelectedSourceChanged事件。

像这样

<mui:ModernTab Layout="Tab" SelectedSourceChanged="ModernTab_SelectedSourceChanged" Background="Blue" AllowDrop="True" Name="tabcontroller" >

C＃代码是

private void ModernTab_SelectedSourceChanged(object sender, SourceEventArgs e)
    {
          var links = ((ModernTab)sender).Links;

          var link = this.tabcontroller.Links.FirstOrDefault(l => l.Source == e.Source);

          if (link != null) {
              var index = this.tabcontroller.Links.IndexOf(link);
              MessageBox.Show(index.ToString());
          }            
    }

是否在标准WPF选项卡控件中选择了选项卡更改事件

9 个答案: