WPF ICommand vs RoutedCommand(WPF ICommand vs RoutedCommand)

我们有一个按钮Command属性绑定到一个自定义命令。

什么时候应该实现ICommand ，从RoutedCommand派生？ 我看到RoutedCommand实现了ICommand 。

在这种情况下，我需要补充一个ICommand吗？ MVVM模型怎么样？ 哪一个适合这个目的？

Let's have a button Command property bound to a custom command.

When should I implement ICommand and when derive from RoutedCommand? I see that RoutedCommand implements ICommand.

In which case could I need to iplement an ICommand? What about MVVM model? Which one suits better for this purpose?