New Post: how to create multi-shell window application using Prism 4.0 and MEF with MVVM

Hi Agustin,

Thanks a lot for the answer. But I followed your suggestion to use View Injection after reading thoroughly Chapter 7, but always got an exception:

Activation error occured while trying to get instance of type MyView, key ""

Here is the code to lanuch MyView and got that exception:

IRegionManager regionManager = ServiceLocator.Current.GetInstance<IRegionManager>();           

var newRegionManager = regionManager.CreateRegionManager();

var newShell = new MyNewShell(newRegionManager/*, neweventAggregator*/);           

RegionManager.SetRegionManager(newShell, newRegionManager);           

RegionManager.SetRegionName(newShell.DemoRegion, RegionNames.ARegionName);           

RegionManager.UpdateRegions();           

// View injection           

IRegion region = newRegionManager.Regions[RegionNames.ARegionName];
                     

MyView newView = ServiceLocator.Current.GetInstance<MyView>(); //this line caused Activation error occured while trying to get instance of type MyView, key ""

// MyView newView = new MyView();    //this line will not cause exception but won't cause the constructor of view model referenced by this view to be executed thus unusable.      

region.Add(newView, "NewView");           

region.Activate(newView);

 newShell.Show();

I have made sure MyView assembly is loaded in bootstrapper, and it has either [Export] or [ViewExport] declaration in the code behind file for MyView class so MEF should be able to find it.

Really appreciate more help from you. Thank you in advance.