策略模式结合简单工厂

   public interface ITurn
    {
       string GetUrl();
    }

  public class NatiuBase:ITurn
    {
        public string StartDate { get; set; }
        public string EndDate { get; set; }
        public string PDUId { get; set; }
        public string Type { get; set; }

        public NatiuBase(DD d)
        {
            this.StartDate = d.StartDate;
            this.EndDate = d.EndDate;
            this.PDUId = d.PDUId;
            this.Type = d.Type;
        }

        public virtual string GetUrl()
        {
            return "我是父类";
        }

    }

 public class KDS:NatiuBase
    {
        public KDS(DD d): base(d)
        { }
        public override string GetUrl()
        {
            return string.Format("开始日期:{0},结束日期{1}", StartDate, EndDate);
        }
    }

//简单工厂
public class CsFactory
    {
        public static ITurn create(DD d)
        {
            ITurn iturn = null;
            switch (d.Type)
            {
                case "KDS_ALL":
                    iturn = new KDS(d);
                    break;
                case "Nat":
                    iturn = new NatiuBase(d);
                    break;
            }
            return iturn;
        }
    }

    //参数
    public class DD
    {
        public string StartDate { get; set; }
        public string EndDate { get; set; }
        public string PDUId { get; set; }
        public string Type { get; set; }

        public DD(string startDate,string endDate,string pduId,string type)
        {
            this.StartDate = startDate;
            this.EndDate = endDate;
            this.PDUId = pduId;
            this.Type = type;
        }
    }

 static void Main(string[] args)
        {
            //Context context = new Context(new KDS("2012-02-12", "2012-09-12", "50000", "kds_all"));
            //Console.WriteLine(context.GetUrl());

            //Context context2 = new Context(new NatiuBase("2012-02-12", "2012-09-12", "50000", "kds_all"));
            //Console.WriteLine(context2.GetUrl());

            DD d = new DD("2016-02-12", "2016-06-12", "500010", "KDS_ALL");
            ITurn iturn = CsFactory.create(d);
            string ss = iturn.GetUrl();
            Console.WriteLine(ss);
            Console.ReadKey();
        }