Create  a null implementation of IBar that NOPs all methods. That way MyService 
doesn't have a dangling null reference that will likely cause problems in the 
code. In your new project register the null implementation with windsor, 
everywhere else register the concrete implementation.

From: [email protected] 
[mailto:[email protected]] On Behalf Of Scott_M
Sent: 25 July 2012 22:13
To: [email protected]
Subject: Windsor / null dependency injection

Ran into a recent case where one of my new apps is using a component where a 
constructor based dependency of that component is not necessary (IBar) and 
would be painful to inject (lot of projects/related projects to import/build).  
Here is a simplified example:

public MyService : IService
{
  private IFoo _foo;
  private IBar _bar;

  public MyService(IFoo foo, IBar bar)
  {
    _foo = foo;
    _bar = bar;
  }
}

So lets say that the IBar dependency is not needed for the current application 
but IFoo is.  Is there a good way to inject NULL for that dependency using 
windsor config / XML / Nullable<T>?    How is this done?


thanks




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