title: Have to register every class before the autofac container can resolve?
body: <p>let's say this scenario:</p>
  
  <pre><code>public class B {};
  
  public class C
  {
       public C(B b){}
  }
  </code></pre>
  
  <p>To resolve C from Autofac container, I have to register both B and C to container.
  But, today I used <a href="http://unity.codeplex.com/" rel="noreferrer">Unity</a>, it seems I just need to register B to container, then C can be resolved.</p>
  
  <p>So Autofac can't do as Unity do?</p>