Combobox : EventTriggerBehavior SelectionChanged is triggered before the SelectedItem

Hello,

In a mvvm combobox, the EventTriggerBehavior SelectionChanged is triggered before the SelectedItem

<ComboBox x:Name="cmbMainLang"
      assists:ComboBoxAssist.Label="{Binding Hint}"
      PlaceholderText="{Binding Hint}"
      MaxDropDownHeight="200"
      Margin="0 40 0 0"
      DataContext="{Binding UILanguagesComboBox}"
      Items="{Binding Items}"
      SelectedItem="{Binding Selected}">
    <Interaction.Behaviors>
        <EventTriggerBehavior EventName="SelectionChanged">
          <InvokeCommandAction Command="{Binding SelectCommand}"/>
        </EventTriggerBehavior>
    </Interaction.Behaviors>
</ComboBox>

This lead to an unsynchonized combobox value & command

Thanks

[Whiletru3]

Of course 😃 thanks a lot for the confirmation

[wieslawsoltes]

@wieslawsoltes : Hello, we found a workaround using ValueChangedTriggerBehavior.

<ComboBox x:Name="cmbMainLang"
                              assists:ComboBoxAssist.Label="{Binding Hint}"
                              PlaceholderText="{Binding Hint}"
                              MaxDropDownHeight="200"
                              Margin="0 40 0 0"
                              DataContext="{Binding UILanguagesComboBox}"
                              Items="{Binding Items}"
                              SelectedItem="{Binding Selected}">
  <Interaction.Behaviors>
	<ValueChangedTriggerBehavior Binding="{Binding Selected}">
               <InvokeCommandAction Command="{Binding SelectCommand}"/>
         </ValueChangedTriggerBehavior>
    </Interaction.Behaviors>
</ComboBox>

Do you agree that it is a good workaround ?

I would not call it workaround, more like correct solution to what Avalonia framework currently does.