Inversion of Control (IoC) in C#

Hi All,

I hope you are doing well and good.

This article demonstrates that what is "Inversion of Control(Ioc)" and How to use it in real time applications.

Inversion of Control(IoC):

• The term Inversion of Control (IOC) refers to a programming style where a framework or runtime, controls the program flow.
• Inversion of control means we are changing the control from normal way.
• It works on Dependency Inversion Principle. Here "Dependency Inversion Principle(DIP)" helps us to develop loosely couple code by ensuring that high-level modules depend on abstractions rather than concrete implementations of lower-level modules. The Inversion of Control pattern is an implementation of this principle.
• The most software developed on the .NET Framework uses IoC.

Applying Inversion of Control:

Following UML diagram for our example.

Now start coding for the above scenario.

• Create an Interface Named “IVehicle” with 2 methods like below.

    public interface IVehicle

    {

        void Accelerate();

        void Brake();

    }

• Create classes with names “Truck” and “Car” and implement them with above interface like below.

    public class Car : IVehicle

    {

        #region IVehicle Members

        public void Accelerate()

        {

            Console.WriteLine("Car accelerates...");

        }

        public void Brake()

        {

            Console.WriteLine("Car stopped.");

        }

        #endregion

    }

    public class Truck : IVehicle

    {

        #region IVehicle Members

        public void Accelerate()

        {

            Console.WriteLine("Truck accelerates...");

        }

        public void Brake()

        {

            Console.WriteLine("Truck stopped.");

        }

        #endregion

    }

• Finally, create a controller class called “VehicleController” with parameterized constructor and responsible to create objects by using interface IVehicle. The code will be.

    public class VehicleController

    {

        IVehicle m_Vehicle;

        public VehicleController(IVehicle vehicle)

        {

            this.m_Vehicle = vehicle;

        }

        public void Accelerate()

        {

            m_Vehicle.Accelerate();

        }

        public void Brake()

        {

            m_Vehicle.Brake();

        }

    }

• Now, let’s use the above code (IoC implemented code) from main method like below.

    class Program

    {

        static void Main(string[] args)

        {

            IVehicle vehicle = new Car();

            //IVehicle vehicle = new Truck();

            VehicleController vehicleController = new VehicleController(vehicle);

            vehicle.Accelerate();

            vehicle.Brake();

            Console.Read();

        }

    }

Now, you can run the application.

If you have any doubts in this post, please post in comments section.

Thanks for reading the post.