App.xaml file does not get parsed if my app does not set a StartupUri?

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Rather than overriding OnStartup, try using an event instead:

<Application x:Class="My.App"
    xmlns="..."
    Startup="Application_Startup"
    ShutdownMode="OnExplicitShutdown">
        <Application.Resources>
            <app:ServiceLocator x:Key="serviceLocator" />
        </Application.Resources>
    </Application>

Code behind:

public partial class App : Application
{
    public App()
    { }
    private void Application_Startup(object sender, StartupEventArgs e)
    {
        // TODO: Parse commandline arguments and other startup work 
        new MainWindow().Show();
    }
}

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