How to programmatically select a TabItem in WPF TabControl

问题

I would like to know how to select a specific TabItem in a WPF TabControl.

I tried these bellow but nothing work!

MyTabControl.SelectedIndex = x

MyTabControl.SelectedItem = MyTabItem

MyTabControl.SelectedValue = MyTabItem

MyTabItem.IsSelected = True

回答1:

As @Chris says, any of the first three things should work and as @Phyxx says, it doesn't always really work. The problem is some subtle thing about the order of property changes. To work around it you need to let the WPF invoke your tab-selection code in its own time:

Dispatcher.BeginInvoke((Action)(() => MyTabControl.SelectedIndex = x));

This does just what Phyxx' timer does, but in a slightly less extreme way.

回答2:

All your examples except the third one are correct and will work. The problem must be at another location. Maybe you reset the item after setting or your code never is called?

Valid

MyTabControl.SelectedIndex = x   
MyTabControl.SelectedItem = MyTabItem    
MyTabItem.IsSelected = True

Invalid

MyTabControl.SelectedValue = MyTabItem

回答3:

Loop through the TabItems and for the tab to be selected, set

tabItem.IsSelected = true

If there are any other place due to binding changing you will see problem. Otherwise, the above code should work.

回答4:

One thing which hasn't been mentioned above:

The main reason something like this won't work is that the tab items do not have the "Name" property set. Each tab item of the tab control which you want to navigate to programmatically must have its name property set for any of the above code to work.

<tabItem Name="tab1"></tabItem>

回答5:

I have implemented a small MVVM bindings based solution for selecting tab panels pragmatically.

define a property in your view model - Selected int type

bind the property in your view

<TabControl
    x:Name="TabsCandidate" 
    VerticalAlignment="Stretch" 
    TabStripPlacement="Top"
    SelectedIndex="{Binding Selected}"

private int _selected;

public int Selected
{
    get { return _selected; }
    set
    {
        _selected = value;
        OnPropertyChanged("Selected");
    }
}

Set the value to Select property, simply the binding will activate the tab panel.

if you want to navigate from tab panel inside parent tab panels, this solution will simply works, All you need to do is, access the data context of your control and set it
```
// set the property value of the view model which points the index of the tab controller.
((CandidateViewModel)((System.Windows.FrameworkElement)candidateTab.Content).DataContext).Selected = CandidateLogTabIndex;
```

回答6:

Try to set the MyTabControl.SelectedIndex = x in the event handler of DataContextChanged or Loaded of your UI. Hope this will work.

回答7:

I tried all the methods that should have worked, but like you nothing actually changed the selected tab. In the end I got it to work by putting the tab selection code in a DispatcherTimer tick.

       DispatcherTimer switchTabTimer = new DispatcherTimer();
       switchTabTimer.Interval = new TimeSpan(0);
       switchTabTimer.Tick += (object timerSender, EventArgs timerE) =>
       {
           myTabControl.SelectedIndex = 0;
           switchTabTimer.Stop();
       };
       switchTabTimer.Start();

回答8:

if you don't know the index of the tab (hint its not TabIndex) use:

    private async Task ChangeTabTo(TabItem wantedTab) {
        int index = 0;
        for (var i = 0; i < TabControl.Items.Count; i++) {
            var tab = TabControl.Items[i];
            var t = tab as TabItem;
            if (t == null) continue;
            if (t == wantedTab) {
                index = i;
                break;
            }
        }

        await Dispatcher.BeginInvoke((Action)(() => TabControl.SelectedIndex = index));
    }

or modify it to search by name if you don't want to keep a reference to the tab

来源：https://stackoverflow.com/questions/7929646/how-to-programmatically-select-a-tabitem-in-wpf-tabcontrol

标签

wpf

tabcontrol

tabitem