Let's assume that I have the following interfaces and classes:public interface ITest { }public class Test : ITest { }In NinjectWebCommon.cs: kernel.Bind<ITest>().To<Test>();And after this I want to use my ITest interface:public class Vehicle{    private ITest _test = null;    public Vehicle(ITest test)    {        this._test = test;    }}public class TestVehicle{    public Vehicle vehicle = new Vehicle();//this will throw an error, because I haven't parameterless cnstructor in Vehicle class;}I know that in Vehicle class I can to do the parameterless constructor with the following way: public Vehicle(){    this._test = DependencyResolver.Current.GetService<ITest>();}But it seems to be a bad practice and doesn't follow to dependency injection pattern.So, how can I to solve this?
Dependency Injection WIth Parameterless Constructor
asp.net mvc;dependency injection
It's turtles all the way down.Just as you're injecting ITest into Vehicle, you should inject Vehicle into TestVehicle - it doesn't matter that it's a concrete class rather than an interface, just let your DI framework do the work for you.In fact, as you're using NInject, a self-binding will already have been created for Vehicle for you, so there's very little you need to do at all:public class TestVehicle{  private readonly Vehicle _vehicle;  public TestVehicle(Vehicle vehicle)  {    this._vehicle = vehicle;  }}