RelayCommand WPF

public class RelayCommand : ICommand {

    readonly Action<object> _uittevoeren;
    readonly Predicate<object> _kanUitvoeren;

    public RelayCommand(Action<object> execute, Predicate<object> canExecute) {
        if (execute == null)
            throw new ArgumentNullException("Uit te voeren functie kan niet null zijn");

        _uittevoeren = execute;
        _kanUitvoeren = canExecute;
    }


    [DebuggerStepThrough]
    public bool CanExecute(object parameters) {
        return _kanUitvoeren == null ? true : _kanUitvoeren(parameters);
    }

    public event EventHandler CanExecuteChanged {
        add { CommandManager.RequerySuggested += value; }
        remove { CommandManager.RequerySuggested -= value; }
    }

    public void Execute(object parameters) {
        _uittevoeren(parameters);
    }

}