CODEWITHSUNDEEP
log4netprism
David Veeneman
David Veeneman

Reputation: 19122

Prism 2.1: Accessing the IOC Container from App.xaml?

I am creating a Prism 2.1 app in which I have implemented logging, using Log4Net in a custom logger derived from ILoggerFacade. Logging works great; I simply resolve ILoggerFacade against the IOC Container, and it returns my logger, which I send a message to in the usual manner.

Here is my problem: I want to log the application exit, and the logical way to do this seems to be to override OnExit() in App.xaml.cs. But I can't figure out how to get a reference to the Container from App.xaml.cs, so that I can resolve my logger.

Can I reference the Prism IOC Container from App.xaml.cs? If so, how? Thanks.

Upvotes: 4

Views: 1435

Answers (2)

Eugenio
Eugenio

Reputation: 400

In my Prism 4 MEF-application I have no access to Container through bootstrapper instance (Container property is protected).

For such functionality I create special methods in my bootstrapper class that get or set needed objects like logger or something else.

In case of Cameron variant it look like this:

public partial class App : Application
{
    private Bootstrapper _bootstrapper;

    protected override void OnStartup(StartupEventArgs e)
    {
        base.OnStartup(e);

        _bootstrapper = new MyBootstrapper();
        _bootstrapper.Run();
    }

    protected override void OnExit(ExitEventArgs e)
    {
        ILoggerFacade logger = bootstrapper.GetLogger();
        logger.Log("Application Exitting", Category.Info, Priority.Low);

        base.OnExit(e);
    }
}

class MyBootstrapper : MefBootstrapper
{
    public ILoggerFacade GetLogger()
    {
        return Container.GetExportedValue<ILoggerFacade>();
        // as for Logger you can get it by property of Bootstrapper class:
        // return Logger;
    }

    ...
}

Upvotes: 0

Cameron MacFarland
Cameron MacFarland

Reputation: 71856

If you make the Bootstrapper global in App.xaml.cs, then you can access the Container within it.

public partial class App : Application
{
    private static UnityBootstrapper bootstrapper;

    protected override void OnStartup(StartupEventArgs e)
    {
        base.OnStartup(e);

        bootstrapper = new MyBootstrapper();
        bootstrapper.Run();
    }

    protected override void OnExit(ExitEventArgs e)
    {
        ILoggerFacade logger = bootstrapper.Container.Resolve<ILoggerFacade>();
        logger.Log("Application Exitting", Category.Info, Priority.Low);

        base.OnExit(e);
    }
}

Upvotes: 2

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