SelectionChanged event occur before SelectedItem Binding

Question

check the following XAML

<toolkit:ListPicker x:Name="MyListPicker" SelectionMode="Single" SelectedItem="{Binding sign,Mode=TwoWay}" Background="Wheat" ItemsSource="{Binding DataContext.Signs, ElementName=xx}" Width="40" Grid.Row="1" Grid.Column="1" VerticalAlignment="Center" Grid.ColumnSpan="1">
                            <i:Interaction.Triggers>                                  
                                <i:EventTrigger EventName="SelectionChanged">
                                    <cmd:EventToCommand CommandParameter="{Binding SelectedItem,ElementName=MyListPicker}" Command="{Binding DataContext.generate, ElementName=xx}"/>
                                </i:EventTrigger>                                   
                            </i:Interaction.Triggers>

when I change the selection of this ListPicker, this event invoke the generate command which will call Generate Method, in which I will be using the SelectedItem which I've already passed to my viewmodel via the CommandParameter, the value of SelectedItem on my method remains the same, when I do it again , it changes to the previous value not the one most recently selected , it seems to me that the binding to the SelectedItem occur after the SelectionChanged executed, the method executes with the previous value , any ideas/workarounds ?

jcvpacheco jcvpacheco · Accepted Answer · 2012-12-10T12:14:13

Maybe a possible workaround is using "SelectedIndex" instead "SelectedItem" then try get the element from list by this index...it Works. You get the right Index, when is changed.

SelectionChanged event occur before SelectedItem Binding

1 Answers