Prism ViewLocator: How to Fix "Your Views Must Implement IView"

Question

I am running a WPF application. I am using Prism and its ViewLocator .

This means that when I have a view for which a ViewModel is attached, I have to point mvvm:ViewModelLocator.AutoWireViewModel="True" and make it implement the IView interface that I made into the code behind.

In my small test application everything works fine, I get my ViewModel, it is installed in the DataContext of my view.

The problem is that I am using mvvm:ViewModelLocator.AutoWireViewModel="True" , I get this error in the "error list":

"Your Views Must Implement IView"

As far as I understand, the problem is that the xaml editor does not seem to check if my code implements this interface behind the class.

So how to avoid this error?

Answer 1

In fact, Prism 6, which has just been released, eliminates the need to have IView , so you no longer have this message :)

Answer 2

The XAML editor gives an error message when searching for your View model in XAML. Instead, you can do the job in code:

 public MainWindow() { InitializeComponent(); ViewModelLocationProvider.AutoWireViewModelChanged(this); } 

Then the error message is not displayed.

Answer 3

If you do not want to upgrade to Prism 6, here is the solution.

Take the source code of the ViewModelLocator class and in the AutoWireViewModelChanged method AutoWireViewModelChanged delete this line:

  // throw new Exception("Your views must implement IView"); 

Change the namespace of this class to your namespace:

 // namespace Microsoft.Practices.Prism.Mvvm namespace MyNamespace 

And in XAML use this property, not one from Prism:

 <Page xmlns:my="using:MyNamespace" my:ViewModelLocator.AutoWireViewModel="True">