How do I declare a chain of responsibility using decorators in Ninject?

Question

I'd like to declare a chain of responsibility using decorators in Ninject.

Has anyone done that before?

Thanks.

I would just like to point out that chain of responsibility and decorators are different design patterns entirely, perhaps that is why you're having trouble getting answers to this question? — George Mauer, Apr 14 '09 at 14:39

score 13 · Accepted Answer · answered Nov 24 '09 at 19:23

In the new ninject 2.0 syntax you can accomplish this by the following newer syntax:

Bind<IEmailSender>().To<LoggingEmailSender>();
Bind<IEmailSender>().To<SmtpClientEmailSender>().WhenInjectedInto<LoggingEmailSender>();

Just ran into this myself and found that was the way to do it as ForMembersOf has been removed in ninject 2.0

chrisb · Answer 2 · 2009-04-25T16:03:50.360

Assuming I'm understanding the question properly, one approach is something like this:

Bind<IEmailSender>().To<LoggingEmailSender>();
Bind<IEmailSender>().To<SmtpClientEmailSender>().ForMembersOf<LoggingEmailSender>();

The LoggingEmailSender class would have a constructor something like:

LoggingEmailSending(IEmailSender sender)

This should get you a decorator easily enough - just remember that without using attributes, you're kinda limited to a single constructor.

2 Answers2