In a simple statement if I want to define an ASP.NET MVC controller then I can say that classes that are responsible for receiving and processing incoming http requests, handling client input, and sending response back to the client. Controllers also act as a coordinator between Model (Business) and View (Presentation). ASP.NET MVC framework itself creates controller objects at run time. There is only one prerequisite, that is controller class must have a parameter less constructor. But if you need to pass some objects with constructor then what will happen? Simply framework will fail to create controller object. In that case we need to create controller objects by our self and inject dependency there. There are many ways you can inject dependency to a class. For example, it might be Property setter, Method, Constructor injection. In this article I will explain how to inject controller dependency to ASP.NET MVC framework with the help of constructor. Without creating custom controller factory inject dependency to controllers are not possible. So I will also explain how to create a very simple custom controller factory and register it to ASP.NET MVC framework. I will also demonstrate a way to inject dependency to controllers using Managed Extensible Framework (MEF).


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