Francis K. Cheung - All Comments

re: Prism for Windows Runtime: Integrating a Dependency Injection Container

Terrence — Tue, 14 May 2013 20:42:54 GMT

That is right, I remember you changing that in the video. Thank you for your help.

re: Prism for Windows Runtime: Integrating a Dependency Injection Container

Francis Cheung-MSFT — Tue, 14 May 2013 20:27:03 GMT

In your case it will be:

protected override object Resolve(Type type)

{

return this.DIContainer.Resolve(type);

}

re: Prism for Windows Runtime: Integrating a Dependency Injection Container

Francis Cheung-MSFT — Tue, 14 May 2013 20:24:15 GMT

3.Override the Resolve method on the App class so that it uses the container to resolve object instances from a type.

protected override object Resolve(Type type)

{

return _container.Resolve(type);

}

re: Prism for Windows Runtime: Integrating a Dependency Injection Container

Francis Cheung-MSFT — Tue, 14 May 2013 20:22:54 GMT

Your App.Xaml.cs, which I assume derives from MvvmAppBase, has an override of the Resolve method that should use the Unity DI container to perform the resolution. If your overridden Resolve method simply calls base.Resolve, you will get an exception because the MvvmAppBase will by default use Activator.CreateInstance. If you use the Unity container to resolve, the constructor parameters will be resolved by the container.

re: Prism for Windows Runtime: Integrating a Dependency Injection Container

Terrence — Tue, 14 May 2013 20:18:22 GMT

protected override void OnInitialize(IActivatedEventArgs args)

{

base.OnInitialize(args);

//ViewModelLocator.Register(typeof(StartPage).ToString(), () => new StartPageViewModel(FlyoutService));

this.DIContainer.RegisterInstance(FlyoutService);

}

protected override object Resolve(Type type)

{

return base.Resolve(type);

}

re: Prism for Windows Runtime: Integrating a Dependency Injection Container

Terrence — Tue, 14 May 2013 20:16:53 GMT

The resolve method is being called from the SetAutoWireViewModel Method

re: Prism for Windows Runtime: Integrating a Dependency Injection Container

Terrence — Tue, 14 May 2013 20:15:20 GMT

Yes, in fact it is blowing on the Reslove method, it can't resolve StartPageViewModel because there is no paraless ctor.

re: Prism for Windows Runtime: Integrating a Dependency Injection Container

Francis Cheung-MSFT — Tue, 14 May 2013 19:18:14 GMT

Terrence: Did you complete step #3 above, overriding the MvvmAppBase Resolve method?

re: Prism for Windows Runtime: Integrating a Dependency Injection Container

Terrence — Tue, 14 May 2013 19:04:10 GMT

After removing the ViewModelLocator.Register line from the OnInitialize and adding the container.RegisterInstance(FlyoutService), it crashes, wanting the default constructor for the StartPageViewModel.

re: Prism for Windows Runtime: Creating and showing a Flyout using the FlyoutService class

shaggygi — Mon, 13 May 2013 00:26:25 GMT

This worked. Thanks again for the help.