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.

Answer 1

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.

Answer 2

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