Why use a RelayCommand or DelegateCommand instead of just implementing ICommand?

Question

I\'m just learning about MVVM in WPF, I\'m completely new both to WPF as to MVVM (I understand how it works, but have never used it...)

Every single tutorial/article

Answer 1

Nothing ... but DelegateCommand is useful if you have a really specific Command just for your ViewModel and you don't want to expose it to others because it is really just for your ViewModel. Also i like DelegateCommands because they don't need another class which you just pass in your ViewModel, it is less code to write. Your approach is useful if your supplied ViewModel is a base ViewModel which is shared alot which also allows sharing your Command.

Answer 2

If you won't use some base command (of a framework or your own custom command) you'll find yourself writing the same code over and over again. For example: you don't raise CanExecuteChanged event in your own command. The same goes for implementing INotifyPropertyChanged. That's why everyone's using one or another MVVM framework.