How to use CanExecute with Mvvmcross

Question

I have a Button

Answer 1

To follow up on Stuart's answer, it's easy to support both ICommand.CanExecute along with exposing properties to support Android and iOS Mvx bindings.

To do this, convert your typical CanExecute() methods to properties, then add handlers to CanExecuteChanged that calls RaisePropertyChanged on the associated property. Then use RaiseCanExecuteChanged as normal and the PropertyChanged event gets fired as well.

    ...

    // constructor
    public SomeClass()
    {

        DoSomethingCommand = new MvxCommand(OnDoSomething, () => CanDoSomething);
        DoSomethingCommand .CanExecuteChanged += (sender, args) => RaisePropertyChanged(() => CanDoSomething);
    }

    public bool CanDoSomething
    {
        get { ... }
    }

    ...