Selected Index Change on WPF combobox? - wpf

Question

I'm converting an app of mine from WinForms to WPF. I came across this problem where in WinForms if I CLEAR a combobox, that does not fire combobox.selectedindexchange. It only fires when the user actually changes the index.
That's the functionality I need. However in WPF I can only find combobox.SelectionChanged. This unfortunately fires on both index change and clearing a combobox (any change).
In WPF how can I only trigger an event when the user changes the index? I'm assuming there's a solution I'm missing that's like the WinForms solution. I'm trying not to play games with global variables and having to track what was previously selected....that's a mess.
Mouseleave is also a mess.
I would greatly appreciate any help!

Answer 1

In your case you can implement in SelectionChanged event:
Private Sub OnSelectionChanged(sender As System.Object, e As System.Windows.Controls.SelectionChangedEventArgs)
Dim combo = TryCast(sender, ComboBox)
If combo.SelectedItem IsNot Nothing Then
'do something
End If
End Sub

Answer 2

You can remove event handler, invoke clear method and add again event handler.
Example code:
<StackPanel>
<ComboBox Name="myCB"
SelectionChanged="ComboBox_SelectionChanged">
<ComboBoxItem>test1</ComboBoxItem>
<ComboBoxItem>test2</ComboBoxItem>
<ComboBoxItem>test3</ComboBoxItem>
</ComboBox>
<Button Content="Clear" Click="Button_Click" />
</StackPanel>
MainWindow class:
Class MainWindow
Private Sub ComboBox_SelectionChanged(sender As System.Object, e As System.Windows.Controls.SelectionChangedEventArgs)
Console.WriteLine("Selected index: {0}", CType(sender, ComboBox).SelectedIndex)
End Sub
Private Sub Button_Click(sender As System.Object, e As System.Windows.RoutedEventArgs)
RemoveHandler Me.myCB.SelectionChanged, AddressOf ComboBox_SelectionChanged
Me.myCB.Items.Clear()
AddHandler Me.myCB.SelectionChanged, AddressOf ComboBox_SelectionChanged
End Sub
End Class