CanExecuteChanged doesn't fire

Hello! Thank you very much for your solution! I tried “simple” version from https://johnthiriet.com/mvvm-going-async-with-async-command/# But I faced a problem that I solved without understanding… The issue is CanExecuteChanged didn’t fire on ObservableCollection change. I tried collection.CollectionChanged += (sender, e) => CalculateAsync.RaiseCanExecuteChanged(); But nothing happened. So the only way I found is to remove the following method public void RaiseCanExecuteChanged() { CanExecuteChanged?.Invoke(this, EventArgs.Empty); } from your code and replace public event EventHandler CanExecuteChanged; with public event EventHandler CanExecuteChanged { add { CommandManager.RequerySuggested += value; } remove { CommandManager.RequerySuggested -= value; } } I’m new with all these things, so I don’t really understand what I have changed. It works now but seems with kind of delay in releasing the button after a command If you have a minute, can you please explain the correct way of fixing my problem, please. Thanks in advance

[tyrgin]

@brminnick thank you very much for your help with code and explanation! 😃 I really appreciate it!)

[brminnick]

And thanks so much for the feedback!

I’ve updated the docs to include an example of CanExecuteChanged:

https://github.com/brminnick/AsyncAwaitBestPractices/blob/master/README.md#asyncawaitbestpracticesmvvm-2