Xamarin Forms - Difference Between ICommand and Command?

Question

In Xamarin Forms MVVM projects, I've seen both:

public ICommand MyCommand {...}

and

public Command MyCommand {...}

What is the difference between the two, and when should I use which? Could I replace all ICommand's with Command's with no ill effect?

Answer 1

What is the difference between the two, and when should I use which?

They both basically provide the same functionality. The first one ICommand allows for more custom implementations of the interface while the second defines an ICommand implementation that wraps a Action. It forces the implementations to have at least a base of Command and also provides a starting point if you don't want to roll your own implementation of ICommand.

Could I replace all ICommand's with Command's with no ill effect?

The framework is happy once what you use inherits from ICommand.

ICommand command = new Command (() => Debug.WriteLine ("Command executed"));
var button = new Button {
  Text = "Hit me to execute the command",
  Command = command,
};