Firing an event when checkbox is checked for WPF

Question

What will be the correct way to get what are currently being checked in the CheckBox. What i have done so far will not firing any event on CheckBox items checked:

<ListBox Grid.RowSpan="3" Grid.Column="2" Grid.ColumnSpan="5" Margin="2" ItemsSource="{Binding MachinePositionList}">
    <ListBox.ItemTemplate>
        <HierarchicalDataTemplate>
            <CheckBox Content="{Binding posID}" IsChecked="{Binding IsChecked, Mode=TwoWay}">
                <i:Interaction.Triggers>
                    <i:EventTrigger EventName="Checked">
                        <i:InvokeCommandAction Command="{Binding CurrentCheckedPosition}" />
                    </i:EventTrigger>
                </i:Interaction.Triggers>                           
            </CheckBox>
       </HierarchicalDataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

Thanks a lot :-).

Answer 1

You can use the checked events:

<CheckBox Name="myCheckBox" 
          Content="I am a checkbox!" 
          Checked="myCheckBox_Checked" 
          Unchecked="myCheckBox_Unchecked" />

And the code for these events is:

private void myCheckBox_Checked(object sender, RoutedEventArgs e)
{
    // ...
}

private void myCheckBox_Unchecked(object sender, RoutedEventArgs e)
{
    // ...
}

EDIT: Just noticed you have the content for the checkboxes as "{Binding posID}" so something you can do (as you have a list of check boxes) is in the checked events, have something like:

if (sender != null)
{
     int posID = Convert.ToInt32(((CheckBox)sender).Name);
}

This will give you the "posID" and you can do what you need too with it. :D