C# 设计模式之 状态模式

拆分复杂的if-else判断分支  把这些逻辑放在类里面完成

using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace DesignPytternDemo{    public interface ITime    {        void SayHello();    }    public abstract class BaseTime : ITime    {        public int Time { get; set; }        public abstract void SayHello();        public BaseTime(int t)        {            this.Time = t;        }    }    public class Morning : BaseTime    {        public Morning(int t) : base(t) { }        public override void SayHello()        {            if (this.Time >= 7 && this.Time < 12)            {                Console.WriteLine("good morning,sir" + " time is {0}" , this.Time);            }            else            {                new Noon(this.Time).SayHello();            }        }    }    public class Noon : BaseTime    {        public Noon(int t) : base(t) { }        public override void SayHello()        {            if (this.Time >= 12 && this.Time <= 13)            {                Console.WriteLine("have a nice lunch ,sir" + " time is {0}" , this.Time);            }            else            {                new AfterNoon(this.Time).SayHello();            }        }    }    public class AfterNoon : BaseTime    {        public AfterNoon(int t) : base(t) { }        public override void SayHello()        {            if (this.Time > 13 && this.Time <= 18)            {                Console.WriteLine("good afternoon,sir" + " time is {0}" , this.Time);            }            else            {                new Night(this.Time).SayHello();            }        }    }    public class Night : BaseTime    {        public Night(int t) : base(t) { }        public override void SayHello()        {            if (this.Time > 18 && this.Time <= 24)            {                Console.WriteLine("good evening,sir" + " time is {0}" ,this.Time);            }            else            {                new DeepNight(this.Time).SayHello();            }        }    }    public class DeepNight : BaseTime    {        public DeepNight(int t) : base(t) { }        public override void SayHello()        {            if (this.Time >= 0 && this.Time < 7)            {                Console.WriteLine("have a good sleep,sir" + " time is {0}" ,this.Time);            }            else            {                Console.WriteLine("oh,unexpected time {0},", this.Time);            }        }    }} static void Main(string[] args)        {            BaseTime bt = new Morning(1);            bt.SayHello();            bt.Time = 8;            bt.SayHello();            bt.Time = 12;            bt.SayHello();            bt.Time = 14;            bt.SayHello();            bt.Time = 21;            bt.SayHello();            Console.ReadLine();        }