Ninject to bind on different controllers

问题:

I am trying to Bind two concrete classes to one interface. What command should I use in Ninject to do that? What I am trying to do is to Bind two concrete classes to one interface base on the controller Name. Is that possible? I suppose that in ninject you use the .When to give the conditional but there is no tutorial out there where they show you how to use the .When for ninject.

回答1:

Here are few examples. Check out Ninject source project and its Tests subproject for various samples of usage, that's the best documentation for it, especially since docs haven't been updated for v2 yet.

// usage of WhenClassHas attribute
Bind<IRepository>().To<XmlDefaultRepository>().WhenClassHas<PageAttribute>().WithConstructorArgument("contentType", ContentType.Page);
// usage of WhenInjectedInto
Bind<IRepository>().To<XmlDefaultRepository>().WhenInjectedInto(typeof(ServicesController));
Bind<IRepository>().To<XmlDefaultRepository>().WhenInjectedInto(typeof(PageController)).WithConstructorArgument("contentType", ContentType.Page);
Bind<IRepository>().To<XmlDefaultRepository>().WhenInjectedInto(typeof(WidgetZoneController)).WithConstructorArgument("contentType", ContentType.WidgetZone);
// you can also do this
Bind<IRepository>().To<PageRepository>().WhenInjectedInto(typeof(PageController)).WithConstructorArgument("contentType", ContentType.Page);
Bind<IRepository>().To<WidgetZoneRepository>().WhenInjectedInto(typeof(WidgetZoneController)).WithConstructorArgument("contentType", ContentType.WidgetZone);
// or this if you don't need any parameters to your constructor
Bind<IRepository>().To<PageRepository>().WhenInjectedInto(typeof(PageController));
Bind<IRepository>().To<WidgetZoneRepository>().WhenInjectedInto(typeof(WidgetZoneController));
// usage of ToMethod()  
Bind<HttpContextBase>().ToMethod(context => new HttpContextWrapper(HttpContext.Current));

HTH