Dependency Injection with Unity

Install Microsoft.Practices.Unity.dll using package manager.

Install-Package Unity -Version 3.5.1404

Create an Interface :

    Public interface ITestInterface

    {

        void Insert(string Name);

        string GetName(string PassedName);

    }

Create class :

    Public class clsTestDI : ITestInterface

    {

        public void Insert(string Name)

        {

           

        }

        public string GetName(string PassedName)

        {

            return "Hello " + PassedName;

        }

    }

Create Dependancy Injection  registrattion  & resolver class :

    using Microsoft.Practices.Unity

    using System.Web.Mvc;

    public class DIResolver

    {

        public void Initialise()

        {           

            var container = new UnityContainer();

            // Register Dependancy

            RegisterTypes(container);

            // Resolve Dependancy

            DependencyResolver.SetResolver(new UnityDependencyResolver(container));           

        }

       

        private void RegisterTypes(UnityContainer container)

        {

            // Register Dependancy

            container.RegisterType<ITestInterface, clsTestDI>();

        }

    }

    public class UnityDependencyResolver : IDependencyResolver

    {

        readonly IUnityContainer _container;

        public UnityDependencyResolver(IUnityContainer container)

        {

            this._container = container;

        }

        public object GetService(Type serviceType)

        {

            try

            {               

                return _container.Resolve(serviceType);

            }

            catch

            {

                return null;

            }

        }

        public IEnumerable<object> GetServices(Type serviceType)

        {

            try

            {

                return _container.ResolveAll(serviceType);

            }

            catch

            {

                return new List<object>();

            }

        }

    }

Register dependency on App_Start event in Global.asax.

        protected void Application_Start()

        {          

            new DIResolver().Initialise();

        }

Now you are able to get access of class’ methods without creating instance (e.g. new class () ;)

  public class ProfileController : Controller

    {

        ITestInterface _Itest;

        public ProfileController(ITestInterface ITest)

        {

            _Itest = ITest;

        }

        //

        // GET: /Profile/

        public new ActionResult Profile()

        {

            string str = _Itest.GetName("Ajay");

            return View();

        }

}