标准WPF选项卡控件中是否有“选定的选项卡更改事件”

在WPF中，是否有一个事件可以用来确定TabControl所选标签的更改时间？

我尝试使用，TabControl.SelectionChanged但是当选项卡中的孩子的选择被更改时，它会被解雇很多次。

我将此绑定到处理程序中以使其工作：

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

如果x:Name将每个属性设置TabItem为：

<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TabItem在活动中访问每个：

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
}

如果您只想在选择选项卡时发生事件，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>

在你的代码中

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

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

生成的事件会冒泡直到处理完毕。

不论。中的更改如何，下面的xaml部分都会在更改了所选项目ui_Tab_Changed后触发。ui_A_ChangedListViewTabItemTabControl

<TabControl SelectionChanged="ui_Tab_Changed">
  <TabItem>
    <ListView SelectionChanged="ui_A_Changed" />
  </TabItem>
  <TabItem>
    <ListView SelectionChanged="ui_B_Changed" />
  </TabItem>
</TabControl>

我们需要在ui_A_Changed（和ui_B_Changed，等等）中使用事件：

private void ui_A_Changed(object sender, SelectionChangedEventArgs e) {
  // do what you need to do
  ...
  // then consume the event
  e.Handled = true;
}

那是正确的事件。也许接线不正确？

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

在后面的代码中...

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

如果我在i = 34行上设置了一个断点，则仅当我更改选项卡时它才会中断，即使这些选项卡具有子元素并且选中了其中之一。

这段代码似乎有效：

    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
        }
    }

如果您使用的是MVVM模式，则使用事件处理程序很不方便（并破坏了模式）。相反，您可以绑定每个单独的TabItem的Selector.IsSelected属性到视图模型中的依赖项属性，然后处理PropertyChanged事件处理程序。这样一来，您就可以准确地知道根据哪个标签选择/取消选择了哪个标签PropertyName并且每个选项卡都有一个特殊的处理程序。

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>

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
 }
}

如果你MainViewModel是INotifyPropertyChanged，而不是DependencyObject，请改用：

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
 }
}

如果有人使用WPF现代UI，则不能使用OnTabSelected事件。但可以使用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());
          }            
    }