MVVM Routed and Relay Command

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RoutedCommand is part of WPF, while RelayCommand was created by a WPF Disciple, Josh Smith ;).

Seriously, though, RS Conley described some of the differences. The key difference is that RoutedCommand is an ICommand implementation that uses a RoutedEvent to route through the tree until a CommandBinding for the command is found, while RelayCommand does no routing and instead directly executes some delegate. In a M-V-VM scenario a RelayCommand (DelegateCommand in Prism) is probably the better choice all around.

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