What do I need to do in my view to make Prism.Uno work with x:Bind?

Question

I come from a WPF / Prism background but I really like what X:Bind offers. How do I get x:Bind to work with my ViewModel when using Prism.Uno?

I have prism:ViewModelLocator.AutoWireViewModel="True" but I seem to be missing something in my understanding of how it works when designing.

Thanks G

Would you have an example of what's not working when using x:Bind? Also note that your View may not be a UserControl at this time see https://stackoverflow.com/questions/61570953/android-wasm-prismmvvmviewmodellocator-autowireviewmodel-true-is-not-wire-u — Jérôme Laban, May 05 '20 at 12:05
Hi Jerome - I did see that issue but I'm staying just with UWP for now until I can get my Refit issue sorted. Sorry I should have been clearer in my initial description. This is at design time rather than when debugging. It's complaining about the variable not being in my code behind .xaml.cs file. — George Bamber, May 05 '20 at 12:37

score 0 · Accepted Answer · answered May 05 '20 at 13:29

The use of x:Bind requires the binding path to be rooted in the View.

To use the DataContext, you'll need make it available typed through the view, like this:

public partial class MyControl : INotifyPropertyChanged
{
#if !HAS_UNO 
        // Uno already defines this event (it will be removed 
        // in the future to be aligned properly with WinUI)
        public event PropertyChangedEventHandler PropertyChanged;
#endif

        public MainPage()
        {
            this.InitializeComponent();

            DataContextChanged += 
                (s, e) => PropertyChanged?.Invoke(
                   this, 
                   new PropertyChangedEventArgs(nameof(ViewModel)));
        }

        public MyViewModel ViewModel => DataContext as MyViewModel;

}

Thanks Jerome. Old school - just wanted to check if there was a more "prism" way but this will work - thanks again. — George Bamber, May 05 '20 at 13:42
You're welcome! This may be something that can be improved in Prism, though, but providing a helper, or even a code generator. — Jérôme Laban, May 05 '20 at 13:51

What do I need to do in my view to make Prism.Uno work with x:Bind?

1 Answers1