创建者模式

  public class Computer
    {
        public object Cpu { get; set; }
        public object MainBoard { get; set; }
        public object Memory { get; set; }
    }
    public abstract class ComputerBuilder
    {
        protected Computer computer;
        public abstract void BuildCpu();

        public abstract void BuildMainBoard();
        public abstract void BuildMemory();

        public Computer GetComputer()
        {
            BuildMainBoard();
            BuildCpu();
            BuildMemory();
            return this.computer;
        }
    }

    public class CmdComputerBuilder : ComputerBuilder
    {

        public override void  BuildCpu()
        {
            //创建cmdCpu的实际业务
            computer.Cpu=new object();
        }
       
        public override void  BuildMainBoard()
        {
            //创建cmd主板的实际业务
            computer.MainBoard = new object();
        }

        public override void  BuildMemory()
        {
            //创建cmd内存的实际业务
            computer.Memory = new object();
        }
    }
    public class IntelComputerBuilder : ComputerBuilder
    {

        public override void BuildCpu()
        {
            //创建IntelCpu的实际业务
            computer.Cpu = new object();
        }

        public override void BuildMainBoard()
        {
            //创建Intel主板的实际业务
            computer.MainBoard = new object();
        }

        public override void BuildMemory()
        {
            //创建Intel内存的实际业务
            computer.Memory = new object();
        }
    }

    public class ComputerFactory
    {
        public static Computer BuildComputer(ComputerBuilder builder)
        {
            return builder.GetComputer();
        }
    }

    public class Client
    {
        public Computer BuyComputer()
        {
            ComputerBuilder builder = new IntelComputerBuilder();
           return ComputerFactory.BuildComputer(builder);
        }
    }