by Jonas Follesø via Jonas Follesø's World of Software on 1/17/2010 12:00:00 AM
There has been lots of talk in the Silverlight community about what is the best way to implement the INotifyPropertyChanged interface. During Christmas I blogged about how you can use dynamic proxies to get INPC implemented automatically. Since then both Einar Ingebrigtsen and Justin Angel have blogged about an interesting approach to INPC using MSIL weaving. I really recommend checking out Justin’s post, as he covers some of the pros and cons of different INPC implementations, as well as purposing an elegant solution using post-build MSIL weaving.
One of the things Justin mentions as a drawback of the dynamic proxy approach is that you cannot simply new up your ViewModel directly and get change notification automatically. You have to explicitly create the ViewModel instance through a proxy creator. Einar also mentioned that he had a hard time finding a way to integrate the proxy creator with an IoC container.
When I write code I’m always careful about where I instantiate my objects, and lately all projects I’ve worked on have used some sort of IoC container. Having an IoC container gives you a single place in your code base to create- and register objects. If the dynamic proxy implementation of automatic INPC is going to be useful it has to be as simple requesting a ViewModel instance from the IoC container. In this blog post I’m going to show how you can combine automatic INPC using dynamic proxy with the Ninject IoC container.
If you have read my blog you may have noticed I got a soft spot for Ninject. I mean, who cannot love a framework whose name, graphic profile and code examples are all about Ninjas? When I first set out to integrate my automatic INPC interceptor with Ninject I wasn’t quite sure where to start. Ninject 1.0 had AOP concepts built in, but in 2.0 (which are under development) this has been moved out of the core and into a separate interception extension module. This is part of the new modular design of Ninject 2.0. Features you may not need all the time are moved out to separate extensions, leaving the core really small and simple (
Original Post: Automatic INPC using dynamic proxy and Ninject
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