blocks|key|1577839|text|我把这个绑定到处理程序中，让它正常工作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1577840|void+TabControl_SelectionChanged(object+sender,+SelectionChangedEventArgs+e)
{
++++if+(e.Source+is+TabControl)
++++{
++++++//do+work+when+tab+is+changed
++++}
}|code-block|syntax|javascript|1577841|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I tied this in the handler to make it work:

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

blocks|key|1362776|text|如果将每个TabItem的x:Name属性设置为：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1362777|<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>|code-block|syntax|javascript|1362778|然后，您可以在活动中访问每个TabItem：|1362779|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
}|1362780|entityMap^0|5|7|D|6|0|0|E|7|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]|$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|V|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|M|3|N|5|H|7|Z|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|10|8|@]|D|@]|E|$]]]|P|$]]

If you set the <code>x:Name</code> property to each <code>TabItem</code> as:

<pre><code>&lt;TabControl x:Name="MyTab" SelectionChanged="TabControl_SelectionChanged"&gt;
 &lt;TabItem x:Name="MyTabItem1" Header="One"/&gt;
 &lt;TabItem x:Name="MyTabItem2" Header="2"/&gt;
 &lt;TabItem x:Name="MyTabItem3" Header="Three"/&gt;
&lt;/TabControl&gt;
</code></pre>

Then you can access to each <code>TabItem</code> at the event:

<pre><code>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
}
</code></pre>

blocks|key|1578201|text|如果您只想在选择选项卡时有一个事件，这是正确的方式：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1578202|<TabControl>
++++<TabItem+Selector.Selected="OnTabSelected"+/>
++++<TabItem+Selector.Selected="OnTabSelected"+/>
++++<TabItem+Selector.Selected="OnTabSelected"+/>
++++
++++<TabItem+Selector.Unselected="OnTabUnSelected"+/>
</TabControl>|code-block|syntax|javascript|1578203|在你的代码中|1578204|++++private+void+OnTabSelected(object+sender,+RoutedEventArgs+e)
++++{
++++++++var+tab+=+sender+as+TabItem;
++++++++if+(tab+!=+null)
++++++++{
++++++++++++//+this+tab+is+selected!
++++++++}
++++}|1578205|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

If you just want to have an event when a tab is selected, this is the correct way:

<pre><code>&lt;TabControl&gt;
 &lt;TabItem Selector.Selected="OnTabSelected" /&gt;
 &lt;TabItem Selector.Selected="OnTabSelected" /&gt;
 &lt;TabItem Selector.Selected="OnTabSelected" /&gt;
 &lt;!-- You can also catch the unselected event --&gt;
 &lt;TabItem Selector.Unselected="OnTabUnSelected" /&gt;
&lt;/TabControl&gt;
</code></pre>

And in your code

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

blocks|key|1362489|text|您仍然可以使用该事件。只需检查发送者参数是否为您实际关心的控件，如果是，则运行事件代码。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1362490|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

You could still use that event. Just check that the sender argument is the control you actually care about and if so, run the event code.

blocks|key|1578417|text|如果您使用的是MVVM模式，那么使用事件处理程序就很不方便(而且打破了这种模式)。相反，您可以将每个单独的TabItem的Selector.IsSelected属性绑定到视图模型中的依赖属性，然后处理PropertyChanged事件处理程序。这样，您就可以根据PropertyName确切地知道选择/取消选择了哪个选项卡，并且每个选项卡都有一个特殊的处理程序。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1578418|示例：MainView.xaml|1578419|<TabControl>
+<TabItem+Header="My+tab+1"+Selector.IsSelected="{Binding+IsMyTab1Selected}">+...+</TabItem>
+<TabItem+Header="My+tab+2"+Selector.IsSelected="{Binding+IsMyTab2Selected}">+...+</TabItem>
</TabControl>|code-block|syntax|javascript|1578420|示例：MainViewModel.cs|1578421|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
+}
}|1578422|如果您的MainViewModel是INotifyPropertyChanged而不是DependencyObject，请使用以下代码：|1578423|1578424|public+event+PropertyChangedEventHandler+PropertyChanged;
protected+virtual+void+OnPropertyChanged(string+propertyName)+{
+PropertyChanged?.Invoke(this,+new+PropertyChangedEventArgs(propertyName));
}

public+MainViewModel()+{
+PropertyChanged+%2B=+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
+}
}|1578425|entityMap^0|1P|J|2S|F|3N|C|0|3|D|0|0|3|G|0|0|4|D|I|M|17|G|0|3|G|0|0^^$0|@$1|2|3|4|5|6|7|X|8|@$9|Y|A|Z|B|C]|$9|10|A|11|B|C]|$9|12|A|13|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|14|8|@$9|15|A|16|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|17|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|18|8|@$9|19|A|1A|B|C]]|D|@]|E|$]]|$1|O|3|P|5|J|7|1B|8|@]|D|@]|E|$K|L]]|$1|Q|3|R|5|6|7|1C|8|@$9|1D|A|1E|B|C]|$9|1F|A|1G|B|C]|$9|1H|A|1I|B|C]]|D|@]|E|$]]|$1|S|3|N|5|6|7|1J|8|@$9|1K|A|1L|B|C]]|D|@]|E|$]]|$1|T|3|U|5|J|7|1M|8|@]|D|@]|E|$K|L]]|$1|V|3|-4|5|6|7|1N|8|@]|D|@]|E|$]]]|W|$]]

If you're using the MVVM pattern then it is inconvenient (and breaks the pattern) to use the event handler. Instead, you can bind each individual TabItem's <code>Selector.IsSelected</code> property to a dependency property in your viewmodel and then handle the <code>PropertyChanged</code> event handler. That way you know exactly which tab was selected/deselected based on the <code>PropertyName</code> and you have a special handler for each tab.

Example: <code>MainView.xaml</code>

<pre><code>&lt;TabControl&gt;
 &lt;TabItem Header="My tab 1" Selector.IsSelected="{Binding IsMyTab1Selected}"&gt; ... &lt;/TabItem&gt;
 &lt;TabItem Header="My tab 2" Selector.IsSelected="{Binding IsMyTab2Selected}"&gt; ... &lt;/TabItem&gt;
&lt;/TabControl&gt;
</code></pre>

Example: <code>MainViewModel.cs</code>

<pre><code>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
 }
}
</code></pre>

If your <code>MainViewModel</code> is <code>INotifyPropertyChanged</code> rather than <code>DependencyObject</code>, then use this instead:

Example: <code>MainViewModel.cs</code>

<pre><code>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
 }
}
</code></pre>

blocks|key|1362709|text|生成的事件一直在冒泡，直到它被处理。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1362710|当在ListView中选择的项发生更改时，下面的xaml部分在ui_A_Changed之后触发ui_Tab_Changed，而不管TabControl中的TabItem更改如何。|offset|length|style|CODE|1362711|<TabControl+SelectionChanged="ui_Tab_Changed">
++<TabItem>
++++<ListView+SelectionChanged="ui_A_Changed"+/>
++</TabItem>
++<TabItem>
++++<ListView+SelectionChanged="ui_B_Changed"+/>
++</TabItem>
</TabControl>|code-block|syntax|javascript|1362712|我们需要在ui_A_Changed+(和ui_B_Changed等)中使用该事件：|1362713|private+void+ui_A_Changed(object+sender,+SelectionChangedEventArgs+e)+{
++//+do+what+you+need+to+do
++...
++//+then+consume+the+event
++e.Handled+=+true;
}|1362714|entityMap^0|0|2|8|V|C|1B|E|1T|A|25|7|0|0|5|C|K|C|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@$D|U|E|V|F|G]|$D|W|E|X|F|G]|$D|Y|E|Z|F|G]|$D|10|E|11|F|G]|$D|12|E|13|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|14|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|15|8|@$D|16|E|17|F|G]|$D|18|E|19|F|G]]|9|@]|A|$]]|$1|O|3|P|5|J|7|1A|8|@]|9|@]|A|$K|L]]|$1|Q|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]]|R|$]]

The event generated is bubbling up until it is handled.

This xaml portion below triggers <code>ui_Tab_Changed</code> after <code>ui_A_Changed</code> when the item selected in the <code>ListView</code> changes, regardless of <code>TabItem</code> change in the <code>TabControl</code>.

<pre><code>&lt;TabControl SelectionChanged="ui_Tab_Changed"&gt;
 &lt;TabItem&gt;
 &lt;ListView SelectionChanged="ui_A_Changed" /&gt;
 &lt;/TabItem&gt;
 &lt;TabItem&gt;
 &lt;ListView SelectionChanged="ui_B_Changed" /&gt;
 &lt;/TabItem&gt;
&lt;/TabControl&gt;
</code></pre>

We need to consume the event in <code>ui_A_Changed</code> (and <code>ui_B_Changed</code>, and so on):

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

blocks|key|1362557|text|这是正确的事件。也许它没有正确连接？|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1362558|<TabControl+SelectionChanged="TabControl_SelectionChanged">
++++<TabItem+Header="One"/>
++++<TabItem+Header="2"/>
++++<TabItem+Header="Three"/>
</TabControl>|code-block|syntax|javascript|1362559|在代码背后..。|1362560|private+void+TabControl_SelectionChanged(object+sender,+SelectionChangedEventArgs+e)
{
++++int+i+=+34;
}|1362561|如果我在i=+34行上设置了一个断点，那么它只会在我更改制表符时断开，即使这些制表符具有子元素并且其中一个元素被选中。|1362562|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

That is the correct event. Maybe it's not wired up correctly?

<pre><code>&lt;TabControl SelectionChanged="TabControl_SelectionChanged"&gt;
 &lt;TabItem Header="One"/&gt;
 &lt;TabItem Header="2"/&gt;
 &lt;TabItem Header="Three"/&gt;
&lt;/TabControl&gt;
</code></pre>

in the codebehind....

<pre><code>private void TabControl_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
 int i = 34;
}
</code></pre>

if I set a breakpoint on the i = 34 line, it ONLY breaks when i change tabs, even when the tabs have child elements and one of them is selected.

blocks|key|1362940|text|这段代码似乎可以工作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1362941|++++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
++++++++}
++++}|code-block|syntax|javascript|1362942|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This code seems to work:

<pre><code> 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
 }
 }
</code></pre>

blocks|key|1578260|text|如果任何人使用WPF现代UI，他们不能使用OnTabSelected+event.but，他们可以使用SelectedSourceChanged事件。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1578261|像这样|1578262|<mui:ModernTab+Layout="Tab"+SelectedSourceChanged="ModernTab_SelectedSourceChanged"+Background="Blue"+AllowDrop="True"+Name="tabcontroller"+>|code-block|syntax|javascript|1578263|C#代码是|1578264|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());
++++++++++}++++++++++++
++++}|1578265|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

If anyone use WPF Modern UI,they cant use OnTabSelected event.but they can use SelectedSourceChanged event.

like this

<pre><code>&lt;mui:ModernTab Layout="Tab" SelectedSourceChanged="ModernTab_SelectedSourceChanged" Background="Blue" AllowDrop="True" Name="tabcontroller" &gt;
</code></pre>

C# code is

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

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

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

In WPF, is there an event that can be used to determine when a <code>TabControl</code>'s selected tab changes?

I have tried using <code>TabControl.SelectionChanged</code> but it is getting fired many times when a child's selection within a tab is changed.

Is there Selected Tab Changed Event in the standard WPF Tab Control

在WPF中，是否有一个事件可用于确定TabControl的选定选项卡何时更改？我试过使用TabControl.SelectionChanged，但是当一个选项卡中的孩子的选择发生变化时，它会被触发很多次。

问在标准WPF选项卡控件中是否存在选定的选项卡更改事件
EN

回答 9

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问在标准WPF选项卡控件中是否存在选定的选项卡更改事件EN

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问在标准WPF选项卡控件中是否存在选定的选项卡更改事件
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