Dereference of a possibly null reference.

Converting null literal or possible null value to non-nullable type.

Unreachable code detected

Non-nullable event 'CanExecuteChanged' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the event as nullable.

Cannot convert null literal to non-nullable reference type.

Unboxing a possibly null value.

Nullability of reference types in type of 'event EventHandler AsyncRelayCommand.CanExecuteChanged' doesn't match implicitly implemented member 'event EventHandler? ICommand.CanExecuteChanged'.

Nullability of reference types in type of parameter 'parameter' doesn't match implemented member 'bool ICommand.CanExecute(object? parameter)' (possibly because of nullability attributes).

Nullability of reference types in type of parameter 'parameter' doesn't match implemented member 'void ICommand.Execute(object? parameter)' (possibly because of nullability attributes).