How can I load multiple controller factories and pass control on to the next one?
I've created a generic controller factory to load entities from the database by parsing out the url:
entity/products/123456.htm
However, I'd like to be able to load an actual controller if the entity is not found, or to override the default entity behavior if necessary by creating a physical controller, instead of a "virtual" on开发者_高级运维e created by the URL pattern.
Right now, in global.asax.cs I'm doing:
ControllerBuilder.Current.SetControllerFactory(typeof(EntityControllerFactory));
How can I, either in EntityControllerFactory
, or here in global.asax.cs
, pass control on to another factory, in the event that I'd like MVC's default controller/action scheme to take over?
You could create a composite IControllerFactory
implementation:
public class EntityControllerFactory : IControllerFactory {
private IControllerFactory defaultFactory = new DefaultControllerFactory();
public IController CreateController(RequestContext requestContext, string controllerName) {
if(needsCustomLogic) {
// do your custom logic here and return appropriate result
} else {
return defaultFactory.CreateController(requestContext, controllerName);
}
}
// same for the other methods on IControllerFactory
}
This works because by default the value of ControllerBuilder.Current.GetControllerFactory()
is an instance of DefaultControllerFactory
.
You might also consider making your factory more future-proof (in case a new version of MVC starts returning a different type from GetControllerFactory
; unlikely but it could happen) by getting the default instance and passing it into your factory:
// in Global.asax
var defaultFactory = ControllerBuilder.Current.GetControllerFactory();
ControllerBuilder.Current.SetFactory(new EntityControllerFactory(defaultFactory));
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