Use Feature Folders with Prism

Question

I have a Xamarin.Forms project that uses Prism, and the number of Views and View Models is growing unwieldy.

In web projects I usually use Feature Folders, grouping relevant code together, e.g.:

• Features
  • Home
    • Home.cshtml
    • Home.cs
    • Home.js
    • HomeController.cs
  • Widgets
    • List.cshtml
    • List.cs
    • List.js
    • Detail.cshtml
    • Detail.cs
    • Detail.js
    • WidgetsController.cs

I'd like to do the same thing in the Xamarin.Forms project, but I don't know how to configure Prism to look for Views and View Models in these locations instead of the Views and ViewModels folders?

Answer 1

You can either manually register view models for views or modify the convention that the ViewModelLocator uses to find the view model for a view.

An example can be found here, although this just replicates the original convention, it shows where to start with your modification:

ViewModelLocationProvider.SetDefaultViewTypeToViewModelTypeResolver( viewType => viewModelType );

Also, this blog post describes how to change the convention to find view models that reside besides the view in the same folder:

ViewModelLocationProvider.SetDefaultViewTypeToViewModelTypeResolver((viewType) =>
{
    var viewName = viewType.FullName;
    var viewAssemblyName = viewType.GetTypeInfo().Assembly.FullName;
    var viewModelName = String.Format(CultureInfo.InvariantCulture, “{0}ViewModel, {1}”, viewName, viewAssemblyName);
    return Type.GetType(viewModelName);
});