Simple NInject demonstration using ASP.NET MVC application.

1. NInject
DI Container
Bhushan Mulmule | bhushan.mulmule@gmail.com | http://dotnetvideotutorial.com

2. If you are new to DI Click here to view
Dependency Injection for Beginners
And then come back!
If link will not work you can copy and paste following url:
http://www.slideshare.net/bhushanmulmule/dependency-injection-for-beginners-31272832

3. Let us create sample ASP.NET MVC
application to see DI in action
We will be using
ASP.NET MVC Application
To Demonstrate NInject
Follow the Walkthrough to create one

4. Create New ASP.NET MVC Project: DIContainerDemo

5. Select Empty Template and Razor View Engine

6. Add Three Classes and One Interface

7. INotification

8. EmailNotification

9. SMSNotification

10. Booking

11. Add New Controller: HomeController

12. To create Object of Booking
class in HomeController
Inject object of EmailNotification
to constructor of Booking

13. HomeController

14. Right Click on Index Method of HomeController 
Add View

15. Modify Views/Home/Index.cshtml

16. Final Structure

17. And the Output will be…

18. To create Object of Booking
class we can also
Inject object of SMSNotification
to constructor of Booking

19. Modified HomeController to use SMSNotification

20. Output will be…

21. Dependency Injection!

23. Problems…

27. DI Container

28. DI container is about removing need of
this object instantiation from client code.

29. Few of the DI Containers are
Unity, Ninject, Autofac,
StructureMap, Spring.NET

30. NInject

31. Installing NInject



Or you can also download dll and add the reference



32. Steps to Set it up

33. Creating NInject kernel object
IKernel kernel = new StandardKernel();
Binding interface with concrete class
kernel.Bind<INotification>().To<EmailNotification>();
Getting object of bounded concrete class
INotification notification = kernel.Get<INotification>();

34. Modified HomeController to use NInject

35. Output as expected…

37. Note: It will act as centralized location for all Ninject configuration.

38. Create Folder DIResolver  Add class
NInjectDependencyResover.cs

39. NInjectDependencyResolver.cs

41. Register our Dependency Resolver in Gloabal.aspx

42. Modify HomeController to use DependencyResolver

43. Time to enjoy fruits of labor

46. Lets try to understand
What's happening behind the scene

50. Steps break up…

52. Note that GetService() receives type parameter in this case it will be
HomeController.

53. Client Request
for index
method of
HomeController
type HomeController
MVC
Ninject
Dependecy
Resolver

55. Client Request
for index
method of
HomeController
type HomeController
MVC
Ninject
Dependecy
Resolver
type HomeController
Ninject

57. Client Request
for index
method of
HomeController
type HomeController
MVC
Ninject
Dependecy
Resolver
type HomeController
Ninject
Inspects
constructor of
HomeController
for dependencies

58. Note: Here Ninject will create object of EmailNotification as we have
bounded it to INotification in AddBinding() method. Same way it can be
bounded to SMSNotification.

62. Client Request
for index
method of
HomeController
type HomeController
MVC
Object HomeController
with
Object EmailNotification
Ninject
Dependecy
Resolver
type HomeController
Ninject
Object HomeController
With
Object EmailNotification
Inspects
constructor of
HomeController
for dependencies

63. “Test Driven Development using Unit
Testing”.

64. Find it out
kernel.Bind<INotification>().To<SMSNotification>()
.WithConstructorArgument("Param", "value");
kernel.Bind<INotification>().To<SMSNotification>()
.WithPropertyValue("PropertyName", "Value");
kernel.Bind<INotification>().To<SMSNotification>()
.When(//"lamda expression returning bool");
kernel.Bind<INotification>().To<SMSNotification>()
.WhenClassHas</*attribute type*/>();

65. Few more…
.WhenInjectedInto()
.WhenMemberHas()
.WhenTargetHas()
.WhenAnyAnchestorNamed()

67. Credits:
Apress Pro
ASP.NET MVC 4

68. http://dotnetvideotutorial.com

69. Thank You
Bhushan Mulmule | bhushan.mulmule@gmail.com | http://dotnetvideotutorial.com