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Unity framework with ASP.Net MVC Framework

Posted by Dhananjay Kumar Articles | ASP.NET MVC July 12, 2009
This article will explain step by step that how to inject dependency using UNITY framework in ASP.Net MVC Application
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Objective:

This article will explain step by step that how to inject dependency using UNITY framework in ASP.Net MVC Application

Step 1:

Create a MVC application

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Step 2:

Add Unity references to the MVC application.

Step 3:

Idea here is to create a custom controller factory. This custom controller factory will create the controller and inject the dependencies in that. Add a class to the project. Feel free to give any name; here name of the class is CustomUnityControllerFactory.

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Extend this CustomUnityControllerFactory class from DefaultControllerFactory class.

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Create reference of IUnityContainer. Don't forget to add include namespace Unity.

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Create the constructor for CustomUnityControllerFactory and pass reference of Unity Container in that.

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Override GetControllerInstance of DefaultControllerFactory. Here we will pass type of the controller , which we are going to create. In parameter of overrideen function we are passing type of the controller to be instanciated.

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So the complete CustomUnityControllerFactory class will look like below.

CustomUnityControllerFactory.cs

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Step 4
:

Now we need to do something at start up of the application. For that open Global. asax file. We need to modify Application.Start() method.

  • Create instance of IUnityContainer.
  • Create instance of CustomUnityControllerFactory and pass instance of unity container in that.
  • Set the CustomUnityControllerFactory as the default controller factory to be used. For this call Current method on ControllerBuilder and pass instance of CustomUnityControllerFactory in that. (see below code in blue)
  • Compile the application.

    image8.gif

Step 5:

Now it is time to check that, how Custom Unity Container Factory is working. To test that, we will create a service interface and concrete service class in Model.

  • Right click on Model and add an interface

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    Interface contains the below code.

    image10.gif
     

  • Right click on Model and add a class and implement the Message() method.

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    Class contains the below code

    image12.gif

Step 6:

Go to Application_Start() and register the type.

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So, now the complete code at Application Start () will look like

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Step 7:

Now put a breakpoint at constructor of HomeController and run the application. We could see while debugging that dependency has been injected.

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Now, you can see that dependency has been injected. Now normal routing will process. For Routing and other details of MVP read my articles here.

Conclusion:

I showed how to inject dependency using Unity in MVC application. 

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