Custom Controller Factory

Constructor Injection is the DI technique of passing an object's dependencies to its constructor. But this by default will not work with Mvc unless you have a parameterless constructor also defined. If you try to run, it will throw error stating that “No parameterless constructor is defined for this object”. A way to get around this and have DI is by defining both parameterless constructor as well as one with which you want to have dependency.

public class ProductController : Controller
    {
        #region Constructor
        
        public ProductController()
            : this(new ProductModel())
        {
        }

        public ProductController(IProductModel productModel)
        {
            if (productModel == null)
                throw new ArgumentNullException("productModel");
            ProductModel = productModel;
        }

        private IProductModel ProductModel { get; set; } 

        #endregion

The other way to achieve this is by defining CustomeControllerFactoryWithoutDefaultConstructor something like this

public class CustomeControllerFactoryWithoutDefaultConstructor : DefaultControllerFactory
    {
        protected override IController GetControllerInstance(System.Web.Routing.RequestContext requestContext, Type controllerType)
        {
            return Activator.CreateInstance(controllerType, new ProductModel()) as IController;
        }
    }

And then register this in Global.asax:

ControllerBuilder.Current.SetControllerFactory(typeof(CustomeControllerFactoryWithoutDefaultConstructor));