Question

I am using Silverlight 4 + PRISM + MVVM in my application. I want to pass a complex object to another page. I dont know how to do that. I cant/dont want to use URI parameters.

Answer 1

I implemented INavigationAware interface, and set the complex object in navigationContext.NavigationService.Region.Context in OnNavigatedFrom() method. Now in the next page, again I implemented INavigationAware interface and now I check for the same value in OnNavigatedTo() to get the value.

Update: I posted answer with code in another question. Mentioning it here for reference –

First derive the viewmodel from INavigationAware interface –

public class MyViewModel : INavigationAware
 { ...

You can then implement OnNavigatedFrom and set the object you want to pass as navigation context as follows –

void INavigationAware.OnNavigatedFrom(NavigationContext navigationContext)
{
     SharedData data = new SharedData();
     ...
     navigationContext.NavigationService.Region.Context = data;
}

and when you want to receive the data, add the following piece of code in the second view model –

void INavigationAware.OnNavigatedTo(NavigationContext navigationContext)
{
    if (navigationContext.NavigationService.Region.Context != null)
    {
                if (navigationContext.NavigationService.Region.Context is SharedData)
                {
                    SharedData data = (SharedData)navigationContext.NavigationService.Region.Context;
                    ...
                }
    }
}

hope it helps you all!