CODEWITHSUNDEEP
wpfsilverlightmvvmninjectview-model-pattern
silverfighter
silverfighter

Reputation: 6882

How does ViewModel locator work in a modularized System

when I do MVVM Applications I usually have a central ViewModel locator which works with the service locator pattern. This allows me to inject ViewModel with Services via Ninject

My ViewModel locator usually looks like this:

public class ViewModelLocator
{
    private static IKernel kernel;

    public ViewModelLocator()
    {
        if (kernel == null)
        {
            kernel = new StandardKernel(new ConfigModule());
        }
    }

    public static T Get<T>()
    {
        return kernel.Get<T>();
    }


    public static ProductViewModel ProductViewModel{

        get { return kernel.Get<ProductViewModel>(); }

    }

    public UserViewModel UserViewModel {
        get { return kernel.Get<UserViewModel>();}
    }
}

public class ConfigModule : NinjectModule
{
    public override void Load()
    {

        Bind<ProductViewModel>().ToSelf();
        Bind<UserViewModel>().ToSelf();

    }
}

Right now I am thinking on adding another Module which is called "Orders". So I will have an OrderViewModel (or in real live a couple of them). And I want to have them seperated and imported via MEF.

How could I extend / change this approach to be able to work with a centric viewmodel locator and imported viewmodels and views.

Yeah I know Prism and Caliburn but it would be intressting for me to see the approach...

Thanks for any help....

Upvotes: 1

Views: 820

Answers (1)

Jess Chadwick
Jess Chadwick

Reputation: 2373

Take a look at the MVVM Light samples (specifically the ViewModelLocator) for a great example of the pattern in action.

Note: you don't need to use the MVVM Light framework to apply this pattern - what you're really looking at it the architecture. The framework just makes it easier! FWIW, I do recommend you use a framework... :)

Upvotes: 0

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