Question

How can I set an event handler (such as keydown) to entire solution, not a single window?

Answer 1

Register a global event handler in your application class (App.cs), like this:

public partial class App : Application
{
    protected override void OnStartup(StartupEventArgs e)
    {
        base.OnStartup(e);

        EventManager.RegisterClassHandler(typeof(Window), Window.KeyDownEvent, new RoutedEventHandler(Window_KeyDown));
    }

    void Window_KeyDown(object sender, RoutedEventArgs e)
    {
        // your code here
    }
}

This will handle the KeyDown event for any Window in your app. You can cast e to KeyEventArgs to get to the information about the pressed key.