DependencyInjectionWithIoC

Dependency Injection using Unity Container

This demo is about how we can use dependency injection and get it resolved with the help of unity.

Interface - ISubject has two method string GetDescription(); string GetReferenceBookName();

Math and Physics class are implementing ISubject according to their need.

In Program.cs --

Using the container:

static IUnityContainer container = new UnityContainer();

and Register the Isubject:

    static void SetUpContainer()
    {
        container.RegisterType<ISubject, Math>();    // This means -- when you get ISubject, use Math

        //Or use the below if you want Physics instance  
        //container.RegisterType<ISubject, Physics>(); //// This means -- when you get ISubject, use Physics
    }

From main, we can use in convention way like:

        ISubject subject = new Math(); //Or like below line
        //ISubject subject = new Physics();

        Console.WriteLine("Subject Desc: " + subject.GetDescription());
        Console.WriteLine("Reference Book: " + subject.GetReferenceBookName());

With Unity, same can be achieved as :

        SetUpContainer();
        ISubject sub = container.Resolve<ISubject>();
        Console.WriteLine("Unity : Subject Desc: " + sub.GetDescription());
        Console.WriteLine("Unity: Reference Book: " + sub.GetReferenceBookName());