Builder模式--经典模式

  public class Vehicle

    {

        public IEnumerable<string> Wheels { get; set; }

        public IEnumerable<string> Lights { get; set; }

    }

 

 

    /// <summary>

    /// abstract builder

    /// </summary>

    public abstract class VehicleBuilderBase

    {

        public Vehicle Vehicle { get; protected set; }



        public virtual void Create()

        {

            Vehicle = new Vehicle();

        }



        public abstract void AddWheels();

        public abstract void AddLights();

    }

 

 

 

 /// <summary>

    /// concrete builder

    /// </summary>

    public class CarBuilder : VehicleBuilderBase

    {

        #region VehicleBuilderBase Members



        public override void AddWheels()

        {

            Vehicle.Wheels = new string[] {"front", "front", "back", "back"};

        }



        public override void AddLights()

        {

            Vehicle.Lights = new string[] { "front", "front", "back", "back" };

        }



        #endregion

    }



    /// <summary>

    /// concrete builder

    /// </summary>

    public class BicycleBuilder : VehicleBuilderBase

    {

        #region VehicleBuilderBase Members



        public override void AddWheels()

        {

            Vehicle.Wheels = new string[] { "front", "back" };

        }



        public override void AddLights()

        {

            Vehicle.Lights = null;

        }



        #endregion

    }

 

 

调用

   [TestMethod]

        public void BuildUp()

        {

            var maker = new VehicleMaker();

            maker.Builder = new CarBuilder();

            maker.Construct();

            Assert.AreEqual<int>(4, maker.Vehicle.Wheels.Count());

            Assert.AreEqual<int>(4, maker.Vehicle.Lights.Count());

            maker.Builder = new BicycleBuilder();

            maker.Construct();

            Assert.AreEqual<int>(2, maker.Vehicle.Wheels.Count());

            Assert.IsNull(maker.Vehicle.Lights);

            

        }