Using Unity DI container in WPF application

Question

I'm new in WPF, and consider to try DI. I decide to take OnStartup method as Composition Root.

  protected override void OnStartup(StartupEventArgs e)
    {      
        IUnityContainer container = new UnityContainer();
        container.RegisterType<IMailSender, Model.Concrete.GmailSender>();
        var mainWindow = container.Resolve<MainWindow>();
        mainWindow.Show();
    }

But, after the application is started, appears two windows, normal, with my content, and totally empty (seems like not initialized). What is wrong?

My guess is you have the Application.StartupUri propery set in App.xaml. You need to remove it. — Sriram Sakthivel
– Sriram Sakthivel, Commented Apr 30, 2015 at 20:03
If you are just starting, I would advise taking a look at Prism which includes this DI functionality in the form of MEF or Unity, the real benefit of using an established framework is the amount of documentation out there. Other frameworks with similar functionality are available. — Lukazoid
– Lukazoid, Commented Apr 30, 2015 at 20:10

Ayyappan Subramanian · Accepted Answer · 2015-04-30 20:06:44Z

3

You need to Remove the StartUri in App.XAML. Also it is good practice to set the application main window. Refer below code.

protected override void OnStartup(StartupEventArgs e)
    {
        IUnityContainer container = new UnityContainer();
        container.RegisterType<IMailSender, Model.Concrete.GmailSender>();
        var mainWindow = container.Resolve<MainWindow>();            
        Application.Current.MainWindow = mainWindow;
        Application.Current.MainWindow.Show();
    }

answered Apr 30, 2015 at 20:06

Ayyappan Subramanian

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1 Comment

Lukazoid Over a year ago

If I recall correctly, MainWindow gets set to the first Window displayed automatically.

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