Builder Design Pattern | C#

Builder Design Pattern with easy Code Examples

I have explained the following in this :

• Creational design patterns
• What is Builder #DesignPattern C# with very easy code example
• Why Builder Design Pattern is important to understand
• Cover the use cases of Builder Design Pattern
• Advantages & Code go through

// "Director" class Director { IBuilder builder; // A series of steps-in real life, steps are complex. public void Construct(IBuilder builder) { this.builder = builder; builder.StartUpOperations(); builder.BuildBody(); builder.InsertWheels(); builder.AddHeadlights(); builder.EndOperations(); } }

// Builders common interface

    interface IBuilder

    {

        void StartUpOperations();

        void BuildBody();

        void InsertWheels();

        void AddHeadlights();

        void EndOperations();

        Product GetVehicle();

    }

// ConcreteBuilder: Car class Car : IBuilder { private string brandName; private Product product; public Car(string brand) { product = new Product(); this.brandName = brand; } public void StartUpOperations() { //Starting with brandname product.Add(string.Format("Car Model name :{0}", this.brandName)); } public void BuildBody() { product.Add("This is a body of a Car"); } public void InsertWheels() { product.Add("4 wheels are added"); } public void AddHeadlights() { product.Add("2 Headlights are added"); } public void EndOperations() { //Nothing in this case } public Product GetVehicle() { return product; } }

// ConcreteBuilder:Motorcycle

    class MotorCycle : IBuilder

    {

        private string brandName;

        private Product product;

        public MotorCycle(string brand)

        {

            product = new Product();

            this.brandName = brand;

        }

        public void StartUpOperations()

        {           

            //Starting with brandname

            product.Add(string.Format("Motorcycle Model name :{0}", this.brandName));

        }

        public void BuildBody()

        {

            product.Add("This is a body of a Motorcycle");

        }

        public void InsertWheels()

        {

            product.Add("2 wheels are added");

        }

        public void AddHeadlights()

        {

            product.Add("1 Headlights are added");

        }

        public void EndOperations()

        {

           //Nothing in this case

        }

        public Product GetVehicle()

        {

            return product;

        }

    }

// "Product" class Product { HttpContext _httpContext => new HttpContextAccessor().HttpContext; private List<string> parts; public Product() { parts = new List<string>(); } public void Add(string part) { //Adding parts parts.Add(part); } public void Show() { _httpContext.Response.WriteAsync("\n\nProduct completed as below :\n"); _httpContext.Response.WriteAsync("********************************\n"); foreach (string part in parts) _httpContext.Response.WriteAsync(part+"\n"); } }

MainClass.cs

Director director = new Director(); IBuilder carBuilder = new Car("Ford"); IBuilder motorCycleBuilder = new MotorCycle("Honda"); // Making Car director.Construct(carBuilder); Product carProduct = carBuilder.GetVehicle(); carProduct.Show(); //Making MotorCycle director.Construct(motorCycleBuilder); Product motorCycleProduct = motorCycleBuilder.GetVehicle(); motorCycleProduct.Show();

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