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Design Pattern - Builder(C#)

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Definition

Separate the construction of a complex object from its representation so that the same construction process can create different representations.

Participants

    The classes and/or objects participating in this pattern are:

  • Builder (VehicleBuilder)
    • Specifies an abstract interface for creating parts of a Product object
  • ConcreteBuilder (MotorCycleBuilder, CarBuilder, ScooterBuilder)
    • Constructs and assembles parts of the product by implementing the Builder interface
    • Defines and keeps track of the representation it creates
    • Provides an interface for retrieving the product
  • Director (Shop)
    • Constructs an object using the Builder interface
  • Product (Vehicle)
    • Represents the complex object under construction. ConcreteBuilder builds the product's internal representation and defines the process by which it's assembled
    • Includes classes that define the constituent parts, including interfaces for assembling the parts into the final result

Sample code in C#


This structural code demonstrates the Builder pattern in which complex objects are created in a step-by-step fashion. The construction process can create different object representations and provides a high level of control over the assembly of the objects.

// --------------------------------------------------------------------------------------------------------------------// <copyright company="Chimomo's Company" file="Program.cs">// Respect the work.// </copyright>// <summary>// Structural Builder Design Pattern.// </summary>// --------------------------------------------------------------------------------------------------------------------namespace CSharpLearning{    using System;    using System.Collections.Generic;    /// <summary>    /// Startup class for Structural Builder Design Pattern.    /// </summary>    public static class MainApp    {        #region Public Methods and Operators        /// <summary>        /// Entry point into console application.        /// </summary>        public static void Main()        {            // Create director and builders            var director = new Director();            Builder b1 = new ConcreteBuilder1();            Builder b2 = new ConcreteBuilder2();            // Construct two products            director.Construct(b1);            Product p1 = b1.GetResult();            p1.Show();            director.Construct(b2);            Product p2 = b2.GetResult();            p2.Show();        }        #endregion    }    /// <summary>    /// The 'Director' class    /// </summary>    internal class Director    {        // Builder uses a complex series of steps        #region Public Methods and Operators        /// <summary>        /// The construct.        /// </summary>        /// <param name="builder">        /// The builder.        /// </param>        public void Construct(Builder builder)        {            builder.BuildPartA();            builder.BuildPartB();        }        #endregion    }    /// <summary>    /// The 'Builder' abstract class    /// </summary>    internal abstract class Builder    {        #region Public Methods and Operators        /// <summary>        /// The build part a.        /// </summary>        public abstract void BuildPartA();        /// <summary>        /// The build part b.        /// </summary>        public abstract void BuildPartB();        /// <summary>        /// The get result.        /// </summary>        /// <returns>        /// The <see cref="Product"/>.        /// </returns>        public abstract Product GetResult();        #endregion    }    /// <summary>    /// The 'ConcreteBuilder1' class    /// </summary>    internal class ConcreteBuilder1 : Builder    {        #region Fields        /// <summary>        /// The product.        /// </summary>        private Product product = new Product();        #endregion        #region Public Methods and Operators        /// <summary>        /// The build part a.        /// </summary>        public override void BuildPartA()        {            this.product.Add("PartA");        }        /// <summary>        /// The build part b.        /// </summary>        public override void BuildPartB()        {            this.product.Add("PartB");        }        /// <summary>        /// The get result.        /// </summary>        /// <returns>        /// The <see cref="Product"/>.        /// </returns>        public override Product GetResult()        {            return this.product;        }        #endregion    }    /// <summary>    /// The 'ConcreteBuilder2' class    /// </summary>    internal class ConcreteBuilder2 : Builder    {        #region Fields        /// <summary>        /// The product.        /// </summary>        private Product product = new Product();        #endregion        #region Public Methods and Operators        /// <summary>        /// The build part a.        /// </summary>        public override void BuildPartA()        {            this.product.Add("PartX");        }        /// <summary>        /// The build part b.        /// </summary>        public override void BuildPartB()        {            this.product.Add("PartY");        }        /// <summary>        /// The get result.        /// </summary>        /// <returns>        /// The <see cref="Product"/>.        /// </returns>        public override Product GetResult()        {            return this.product;        }        #endregion    }    /// <summary>    /// The 'Product' class    /// </summary>    internal class Product    {        #region Fields        /// <summary>        /// The _parts.        /// </summary>        private List<string> parts = new List<string>();        #endregion        #region Public Methods and Operators        /// <summary>        /// The add.        /// </summary>        /// <param name="part">        /// The part.        /// </param>        public void Add(string part)        {            this.parts.Add(part);        }        /// <summary>        /// The show.        /// </summary>        public void Show()        {            Console.WriteLine("\nProduct Parts -------");            foreach (string part in this.parts)            {                Console.WriteLine(part);            }        }        #endregion    }}// Output:/*Product Parts -------PartAPartBProduct Parts -------PartXPartY*/

This real-world code demonstates the Builder pattern in which different vehicles are assembled in a step-by-step fashion. The Shop uses VehicleBuilders to construct a variety of Vehicles in a series of sequential steps.

// --------------------------------------------------------------------------------------------------------------------// <copyright company="Chimomo's Company" file="Program.cs">// Respect the work.// </copyright>// <summary>// Real-World Builder Design Pattern.// </summary>// --------------------------------------------------------------------------------------------------------------------namespace CSharpLearning{    using System;    using System.Collections.Generic;    /// <summary>    /// Startup class for Real-World Builder Design Pattern.    /// </summary>    public static class MainApp    {        #region Public Methods and Operators        /// <summary>        /// Entry point into console application.        /// </summary>        public static void Main()        {            VehicleBuilder builder;            // Create shop with vehicle builders            var shop = new Shop();            // Construct and display vehicles            builder = new ScooterBuilder();            shop.Construct(builder);            builder.Vehicle.Show();            builder = new CarBuilder();            shop.Construct(builder);            builder.Vehicle.Show();            builder = new MotorCycleBuilder();            shop.Construct(builder);            builder.Vehicle.Show();        }        #endregion    }    /// <summary>    /// The 'Director' class    /// </summary>    internal class Shop    {        // Builder uses a complex series of steps        #region Public Methods and Operators        /// <summary>        /// The construct.        /// </summary>        /// <param name="vehicleBuilder">        /// The vehicle builder.        /// </param>        public void Construct(VehicleBuilder vehicleBuilder)        {            vehicleBuilder.BuildFrame();            vehicleBuilder.BuildEngine();            vehicleBuilder.BuildWheels();            vehicleBuilder.BuildDoors();        }        #endregion    }    /// <summary>    /// The 'Builder' abstract class    /// </summary>    internal abstract class VehicleBuilder    {        #region Fields        /// <summary>        /// The vehicle.        /// </summary>        protected Vehicle VehicleField;        #endregion        // Gets vehicle instance        #region Public Properties        /// <summary>        /// Gets the vehicle.        /// </summary>        public Vehicle Vehicle        {            get            {                return this.VehicleField;            }        }        #endregion        #region Public Methods and Operators        /// <summary>        /// The build doors.        /// </summary>        public abstract void BuildDoors();        /// <summary>        /// The build engine.        /// </summary>        public abstract void BuildEngine();        /// <summary>        /// The build frame.        /// </summary>        public abstract void BuildFrame();        /// <summary>        /// The build wheels.        /// </summary>        public abstract void BuildWheels();        #endregion    }    /// <summary>    /// The 'ConcreteBuilder1' class    /// </summary>    internal class MotorCycleBuilder : VehicleBuilder    {        #region Constructors and Destructors        /// <summary>        /// Initializes a new instance of the <see cref="MotorCycleBuilder"/> class.        /// </summary>        public MotorCycleBuilder()        {            this.VehicleField = new Vehicle("MotorCycle");        }        #endregion        #region Public Methods and Operators        /// <summary>        /// The build doors.        /// </summary>        public override void BuildDoors()        {            this.VehicleField["doors"] = "0";        }        /// <summary>        /// The build engine.        /// </summary>        public override void BuildEngine()        {            this.VehicleField["engine"] = "500 cc";        }        /// <summary>        /// The build frame.        /// </summary>        public override void BuildFrame()        {            this.VehicleField["frame"] = "MotorCycle Frame";        }        /// <summary>        /// The build wheels.        /// </summary>        public override void BuildWheels()        {            this.VehicleField["wheels"] = "2";        }        #endregion    }    /// <summary>    /// The 'ConcreteBuilder2' class    /// </summary>    internal class CarBuilder : VehicleBuilder    {        #region Constructors and Destructors        /// <summary>        /// Initializes a new instance of the <see cref="CarBuilder"/> class.        /// </summary>        public CarBuilder()        {            this.VehicleField = new Vehicle("Car");        }        #endregion        #region Public Methods and Operators        /// <summary>        /// The build doors.        /// </summary>        public override void BuildDoors()        {            this.VehicleField["doors"] = "4";        }        /// <summary>        /// The build engine.        /// </summary>        public override void BuildEngine()        {            this.VehicleField["engine"] = "2500 cc";        }        /// <summary>        /// The build frame.        /// </summary>        public override void BuildFrame()        {            this.VehicleField["frame"] = "Car Frame";        }        /// <summary>        /// The build wheels.        /// </summary>        public override void BuildWheels()        {            this.VehicleField["wheels"] = "4";        }        #endregion    }    /// <summary>    /// The 'ConcreteBuilder3' class    /// </summary>    internal class ScooterBuilder : VehicleBuilder    {        #region Constructors and Destructors        /// <summary>        /// Initializes a new instance of the <see cref="ScooterBuilder"/> class.        /// </summary>        public ScooterBuilder()        {            this.VehicleField = new Vehicle("Scooter");        }        #endregion        #region Public Methods and Operators        /// <summary>        /// The build doors.        /// </summary>        public override void BuildDoors()        {            this.VehicleField["doors"] = "0";        }        /// <summary>        /// The build engine.        /// </summary>        public override void BuildEngine()        {            this.VehicleField["engine"] = "50 cc";        }        /// <summary>        /// The build frame.        /// </summary>        public override void BuildFrame()        {            this.VehicleField["frame"] = "Scooter Frame";        }        /// <summary>        /// The build wheels.        /// </summary>        public override void BuildWheels()        {            this.VehicleField["wheels"] = "2";        }        #endregion    }    /// <summary>    /// The 'Product' class    /// </summary>    internal class Vehicle    {        #region Fields        /// <summary>        /// The parts.        /// </summary>        private Dictionary<string, string> parts = new Dictionary<string, string>();        /// <summary>        /// The vehicle type.        /// </summary>        private string vehicleType;        #endregion        // Constructor        #region Constructors and Destructors        /// <summary>        /// Initializes a new instance of the <see cref="Vehicle"/> class.        /// </summary>        /// <param name="vehicleType">        /// The vehicle type.        /// </param>        public Vehicle(string vehicleType)        {            this.vehicleType = vehicleType;        }        #endregion        // Indexer        #region Public Indexers        /// <summary>        /// The this.        /// </summary>        /// <param name="key">        /// The key.        /// </param>        /// <returns>        /// The <see cref="string"/>.        /// </returns>        public string this[
            
           

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