How to use disposable view models in WPF?

Question

How do I ensure view models are properly disposed of if they reference unmanaged resources or have event handlers such as handling elapsed on a dispatcher timer. In the first c

Answer 1

I accomplished this by doing the following:

1. Removing the StartupUri property from App.xaml.

2. Defining my App class as follows:

   public partial class App : Application
   {
       public App()
       {
           IDisposable disposableViewModel = null;
   
           //Create and show window while storing datacontext
           this.Startup += (sender, args) =>
           {
               MainWindow = new MainWindow();
               disposableViewModel = MainWindow.DataContext as IDisposable;
   
               MainWindow.Show();
           };
   
           //Dispose on unhandled exception
           this.DispatcherUnhandledException += (sender, args) => 
           { 
               if (disposableViewModel != null) disposableViewModel.Dispose(); 
           };
   
           //Dispose on exit
           this.Exit += (sender, args) =>
           { 
               if (disposableViewModel != null) disposableViewModel.Dispose(); 
           };
       }
   }