Example of good IoC container usage.

good_ioc.cs

class SomeChildObject : IChildObject
{
  public SomeChildObject(IMyLowLevelDependency foo)
  {
    foo.DoSomething();
  }
}

class MyObject
{
  private ISomeDependency dependency;
  private IChildFactory childFactory;
  private IContainer container;

  public MyObject(ISomeDependency dependency, IChildFactory childFactory, IContainer container)
  {
    this.dependency = dependency;
    this.childFactory = childFactory;
    this.container = container;
  }
	
  public IChildObject DoStuff()
  {
    return this.childFactory.Create(this.container.Resolve<IMyLowLevelDependency>());
  }
}