How to implement Async Command

Question

Although I have understood async programming with c# somehow, still don\'t get why async with void is not the better solution, then when I want to improve my Xamarin Forms code

Answer 1

To anyone interested: Brandons solution above does not requery the CanExecute automatically and requires RaiseCanExecuteChanged(). To change this, you can exchange

    public event EventHandler CanExecuteChanged
    {
        add => _weakEventManager.AddEventHandler(value);
        remove => _weakEventManager.RemoveEventHandler(value);
    }

with

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

and remove

public void RaiseCanExecuteChanged() => _weakEventManager.HandleEvent(this, EventArgs.Empty, nameof(CanExecuteChanged));

This fixed the problem for me.