问题
If I have an implementation of Human and Dog class which uses the IPerson interface and HumanFood and DogFood class using the IFood interface. How can I switch from using HumanFood to DogFood and Human to Dog in my main function?
Currently the way this is written it is giving me a "more than one matching bindings are available" error.
Thanks!
public class Bindings : NinjectModule
{
public override void Load()
{
this.Bind<IFood>().To<HumanFood>();
this.Bind<IFood>().To<DogFood>();
this.Bind<IPerson>().To<Human>();
this.Bind<IPerson>().To<Dog>();
}
}
static void Main(string[] args)
{
IKernel kernel = new StandardKernel();
kernel.Load(Assembly.GetExecutingAssembly());
IFood food = kernel.Get<IFood>();
IPerson person = kernel.Get<IPerson>();
person.BuyFood();
Console.ReadLine();
}
回答1:
Typical ways to do this is to either use named binding:
this.Bind<IFood>().To<HumanFood>().Named("HumanFood");
Or to determine the binding to use based on WhenInjectedInto:
this.Bind<IFood>().To<HumanFood>().WhenInjectedInto<Human>();
this.Bind<IFood>().To<DogFood>().WhenInjectedInto<Dog>();
However, both of these represent a code smell. You may want to rethink why you're injecting varying implementations depending on the destination and perhaps inject an implementation of the factory pattern instead.
A handy overview of some of the stuff you can do can be found here:
http://lukewickstead.wordpress.com/2013/02/09/howto-ninject-part-2-advanced-features/
来源:https://stackoverflow.com/questions/26854101/ninject-multiple-classes-using-single-interface-more-than-one-matching-bindin