ICommand.CanExecute : | <'a -> bool> ISignal | 'a -> bool

[kleidemos]

I want to be able to define commands that can only be executed when parameter is valid. At the moment I need to create a new command for each case / parameter source.

In WPF changing CommandParameter does not call Command.CanExecute when ICommand does not use CommandManager.RequerySuggested for ICommand.CanExecuteChanged. This means that we need a separate implementation for ICommand.

Possible implementation

[FoggyFinder]

@kleidemos if you are still here can you create a PR?