Can I simplify this code? And if so how

Question

I am trying to add multiple commands to my very first MVVM program. But the way I am adding them here feels wrong to me. I want to prevent as much duplication as possible, can I make a kind of parent command that I can easily modify for example?

internal class AddTimerBarCommand : ICommand
{
    public AddTimerBarCommand(MainViewModel viewModel)
    {
        _MainViewModel = viewModel;
    }

    private MainViewModel _MainViewModel;
    public event EventHandler CanExecuteChanged;

    public bool CanExecute(object parameter)
    {
        return true;
    }

    public void Execute(object parameter)
    {
        _MainViewModel.AddTimerBar();
    }
}

internal class RmvTimerBarCommand : ICommand
{
    public RmvTimerBarCommand(MainViewModel viewModel)
    {
        _MainViewModel = viewModel;
    }

    private MainViewModel _MainViewModel;
    public event EventHandler CanExecuteChanged;

    public bool CanExecute(object parameter)
    {
        return true;
    }

    public void Execute(object parameter)
    {
        _MainViewModel.RmvTimerBar();
    }

Answer 1

Are you looking for a base class to reduce code duplication?

If so, this might work for you:

internal abstract class TimerBarCommandBase : ICommand
{
    public TimerBarCommandBase(MainViewModel viewModel)
    {
        _MainViewModel = viewModel;
    }

    protected MainViewModel _MainViewModel;
    public event EventHandler CanExecuteChanged;

    public bool CanExecute(object parameter) { return true; }

    public abstract void Execute(object parameter);
}

internal class AddTimerBarCommand : TimerBarCommandBase
{
    public AddTimerBarCommand(MainViewModel viewModel) : base(viewModel) { }

    public override void Execute(object parameter)
    {
        _MainViewModel.AddTimerBar();
    }
}

internal class RmvTimerBarCommand : TimerBarCommandBase
{
    public RmvTimerBarCommand(MainViewModel viewModel) : base(viewModel) { }

    public override void Execute(object parameter)
    {
        _MainViewModel.RmvTimerBar();
    }
}