使用工厂方法和Unity实现IoC注入

interface IFoo{  
  void DoFoo();
}

class Foo : IFoo {  
  public void DoFoo()  {
     Console.WriteLine("DoFoo()");  
  }
}

class FooFactory{  
  static public IFoo Create()  {    
     Console.WriteLine("CreateInstance");    
     var foo = new Foo();    
     return foo;  
  }
}

using Microsoft.Practices.Unity;
using Microsoft.Practices.Unity.StaticFactory;
// ...

IUnityContainer container = new UnityContainer();
方法一：
container.AddNewExtension<StaticFactoryExtension>()
  .Configure<IStaticFactoryConfiguration>()
  .RegisterFactory<IFoo>(unity => FooFactory.Create());
方法二：(推荐使用方法)
 container.RegisterType<IFoo, IFoo>(new InjectionFactory(unity => FooFactory.Create()));

调用

IFoo foo = container.Resolve<IFoo>();

foo.DoFoo();