What is the advantage of setting DataContext in code instead of XAML?

Question

There seem to be two main ways to define DataContext in WPF:

• either in code like this:

App.xaml.cs (taken from the WPF MVVM Too

Answer 1

I don't like the idea of having Expression Blend try to instantiate my data objects.

I set the DataContext through code where I am able to use Dependency Injection to inject the proper objects, services, providers or what else I am using to find my code.