C#设计模式——状态模式

今天我来说下状态模式。状态模式用处多多，可以实现状态的切换，废话不多说，代码如下：

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace StateModel{    public class Deficit:BeginState    {        public Deficit(BeginState state)        {            this.Account = state.Account;            this.LeastMoeny = state.LeastMoeny;            double HighLine = 0.00;            double LowLine = -100.00;            double interest = 0.00;        }        private void checke()        {            if (LeastMoeny > HighLine)            {                Account.state = new ZeroState(this);            }        }        public override void SaveMoney(double amount)        {            LeastMoeny += amount;            checke();        }        public override void DrawMoney(double amount)        {            if (LeastMoeny-amount <LowLine)            {                Console.WriteLine("您已经没有钱可以取了！");            }        }        public override void GetInterest()        {        }    }}

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using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace StateModel{    public class GetBenefit:BeginState    {        public GetBenefit(ZeroState state)        {            this.Account = state.Account;            this.LeastMoeny = state.LeastMoeny;            double HighLine = 1000000.00;            double LowLine = 500.00;            double interest = 0.03;        }        private void checke()        {            if (LeastMoeny < LowLine)            {                Account.state = new ZeroState(this);                       }           else if (LeastMoeny < 0.0)            {                               Account.state = new Deficit(this);            }        }        public override void SaveMoney(double amount)        {            LeastMoeny += amount;            checke();        }        public override void DrawMoney(double amount)        {            LeastMoeny -= amount;            checke();        }        public override void GetInterest()        {            LeastMoeny += LeastMoeny * interest;            checke();        }    }}

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using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace StateModel{    public class ZeroState:BeginState    {        public ZeroState(Account Account, double LeastMoeny)        {            this.Account=Account;            this.LeastMoeny = LeastMoeny;            double HighLine=500.00;            double LowLine=0.00;            double interest = 0.00;        }        public ZeroState(BeginState state):this(state.Account,state.LeastMoeny)        {                 }//用于简化运算，提高效率，将状态传递到下一步        private void Checke()//定义一个用于判断目前状态的函数        {            if (LeastMoeny > HighLine)            {                Account.state = new GetBenefit(this);//大于上限，则跳转至下一状态            }            else if (LeastMoeny < LowLine)            {                              Account.state = new Deficit(this);            }        }        public override void SaveMoney(double amount)        {            LeastMoeny += amount;            Checke();        }        public override void DrawMoney(double amount)        {            LeastMoeny -= amount;            Checke();        }        public override void GetInterest()        {            LeastMoeny += LeastMoeny * interest;            Checke();        }    }}

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using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace StateModel{    public  class Account    {        public BeginState state{set;get; }        public string AccountName { set; get; }//封装属性        public Account(string AccountName)        {            this.AccountName = AccountName;            this.state = new ZeroState(this,0);//定义初始的变量和启动方法        }        public double LeastMoney         {            get             { return state.LeastMoeny; }//每执行一次，返回当前余额        }        public void save(double amount)        {            state.SaveMoney(amount);            Console.WriteLine("存款金额为："+amount);            Console.WriteLine("当前存款余额为：" + this.LeastMoney);            Console.WriteLine("账户状态：" + this.state.GetType().Name);        }        public void draw(double amount)        {            state.DrawMoney(amount);            Console.WriteLine("取款金额为：" + amount);            Console.WriteLine("当前存款余额为：" + this.LeastMoney);            Console.WriteLine("账户状态：" + this.state.GetType().Name);              }        public void interest()        {            state.GetInterest();            Console.WriteLine("当前获得的利息：");            Console.WriteLine("当前存款余额为：" + this.LeastMoney);            Console.WriteLine("账户状态：" + this.state.GetType().Name);              }    }}

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using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace StateModel{///前面定义了三种银行账户的存储状态    public abstract class BeginState    {        public Account Account {set;get; }        public double LeastMoeny { set; get; }//定义账户余额        public double HighLine { set; get; }//定义上限        public double LowLine { set; get; }//定义下限        public double interest{set;get; }//定义利息        public abstract void SaveMoney(double amount);//定义存钱的抽象方法        public abstract void DrawMoney(double amount);//定义取钱的抽象方法        public abstract void GetInterest();//定义获得利息的抽象方法    }}

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using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace StateModel{    class Program    {        static void Main(string[] args)        {            Account name = new Account("陈翔");            name.save(500.00);            name.save(900.00);            name.save(1800.00);            name.draw(1900.00);            name.draw(1400.00);            name.draw(1400.00);            Console.ReadKey();        }    }}

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