Ancora, ho trovato la soluzione da solo. Ho cercato di mettere il comando in modo sbagliato come qui di seguito, e non funziona:
<MenuItem Header="_Recent files" ItemsSource="{Binding RecentFiles, Converter={StaticResource RecentFilesToListOfStringsConverter}, Mode=OneWay}" >
<MenuItem.ItemContainerStyle>
<Style TargetType="{x:Type MenuItem}">
<Setter Property="Command" Value="{Binding ImportRecentItemCommand}" />
</Style>
</MenuItem.ItemContainerStyle>
</MenuItem>
Ecco l'approccio giusto. Ancora non capisco come funziona, devi imparare profondamente WPF!
<MenuItem Header="_Recent files" ItemsSource="{Binding RecentFiles, Converter={StaticResource RecentFilesToListOfStringsConverter}, Mode=OneWay}" >
<MenuItem.ItemContainerStyle>
<Style TargetType="{x:Type MenuItem}">
<Setter Property="Command" Value="{Binding DataContext.ImportRecentItemCommand, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type MenuItem}, AncestorLevel=1}}" />
</Style>
</MenuItem.ItemContainerStyle>
</MenuItem>
EDIT: La versione finale
XAML:
<MenuItem Header="_Recent files" ItemsSource="{Binding RecentFiles, Converter={StaticResource RecentFilesToListOfStringsConverter}, Mode=OneWay}" >
<MenuItem.ItemContainerStyle>
<Style TargetType="{x:Type MenuItem}">
<Setter Property="Command" Value="{Binding DataContext.ImportRecentItemCommand, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type MenuItem}, AncestorLevel=1}}" />
<Setter Property="CommandParameter" Value="{Binding}" />
</Style>
</MenuItem.ItemContainerStyle>
</MenuItem>
ViewModel: MVVM Luce Toolkit viene utilizzato, RelayCommand va da lì:
private ICommand _importRecentItemCommand;
public ICommand ImportRecentItemCommand
{
get { return _importRecentItemCommand ?? (_importRecentItemCommand = new RelayCommand<object>(ImportRecentItemCommandExecuted)); }
}
private void ImportRecentItemCommandExecuted(object parameter)
{
MessageBox.Show(parameter.ToString());
}
Godetevi