BankCount类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace 状态模式
{
    // 抽象状态类
   public abstract  class State
    {
       //状态
       public Account Account { get; set; }
       // 余额
       public double Balance { get; set; }
       // 利率
       public double Interest { get; set; }
       // 上限
       public double LowerLimit { get; set; }
       // 下限
       public double UpperLimit { get; set; }
       // 存款
       public abstract void Deposit(double amount);
       // 获得利息
       public abstract void PayInterest();
       // 取钱
       public abstract void Withdraw(double amount);
    }

   public class Account
   {
       public Account(string owner)
       {
           this.Owner = owner;
           this.State = new SilverState(0.00, this);
       }

       public double Balance { get { return State.Balance; } }
       public string Owner { get; set; }
       public State State { get; set; }

       //存款
       public void Deposit(double amount)
       {
           State.Deposit(amount);
           Console.WriteLine("存款金额为：{0:C}---", amount);
           Console.WriteLine("账户余额为 =:{0:C}", this.Balance);
           Console.WriteLine("账户状态为: {0}", this.State.GetType().Name);
           Console.WriteLine();
       }

       //余额
       public void PayInterest()
       {
           State.PayInterest();
           Console.WriteLine("Interest Paid --- ");
           Console.WriteLine("账户余额为 =:{0:C}", this.Balance);
           Console.WriteLine("账户状态为: {0}", this.State.GetType().Name);
           Console.WriteLine();
       }

       //取款
       public void Withdraw(double amount)
       {
           State.Withdraw(amount);
           Console.WriteLine("取款金额为：{0:C}---", amount);
           Console.WriteLine("账户余额为 =:{0:C}", this.Balance);
           Console.WriteLine("账户状态为: {0}", this.State.GetType().Name);
           Console.WriteLine();
       }
   }
   //新建账户
   public class SilverState : State
   {
       public SilverState(State state)
           : this(state.Balance, state.Account)
       {
       }

       public SilverState(double balance, Account account)
       {
           this.Balance = balance;
           this.Account = account;
           Interest = 0.00;
           LowerLimit = 0.00;
           UpperLimit = 1000.00;
       }

       public override void Deposit(double amount)
       {
           Balance += amount;
           StateChangeCheck();
       }

       public override void PayInterest()
       {
           Balance += Interest * Balance;
           StateChangeCheck();
       }

       public override void Withdraw(double amount)
       {
           Balance -= amount;
           StateChangeCheck();
       }

       private void StateChangeCheck()
       {
           if (Balance < LowerLimit)
           {
               Account.State = new RedState(this);
           }
           else if (Balance > UpperLimit)
           {
               Account.State = new GoldState(this);
           }
       }
   }
   public class GoldState : State
   {
       public GoldState(State state)
       {
           this.Balance = state.Balance;
           this.Account = state.Account;
           Interest = 0.05;
           LowerLimit = 1000.00;
           UpperLimit = 10000.00;
       }

       public override void Deposit(double amount)
       {
           Balance += amount;
           StateChangeCheck();
       }

       public override void PayInterest()
       {
           Balance += Interest * Balance;
           StateChangeCheck();
       }

       public override void Withdraw(double amount)
       {
           Balance -= amount;
           StateChangeCheck();
       }

       private void StateChangeCheck()
       {
           if (Balance < 0.0)
           {
               Account.State = new RedState(this);
           }
           else if (Balance < LowerLimit)
           {
               Account.State = new SilverState(this);
           }
       }
   }

   //透支
   public class RedState : State
   {
       public RedState(State state)
       {
           this.Balance = state.Balance;
           this.Account = state.Account;
           Interest = 0.0;
           LowerLimit = -100.0;
           UpperLimit = 0.00;
       }

       //存款
       public override void Deposit(double amount)
       {
           Balance += amount;
           StateChangeCheck();
       }

       public override void PayInterest()
       {
       }

       //取钱
       public override void Withdraw(double amount)
       {
           Console.WriteLine("没有钱可以取");
       }

       private void StateChangeCheck()
       {
           if (Balance > UpperLimit)
           {
               Account.State = new SilverState(this);
           }
       }
   }
}

调用：

            Account account = new Account("Lear");
            account.Deposit(1000.00); // 存款
            account.Deposit(600.00);
            account.Deposit(200.00);

            account.PanInterest();  

            account.Withdraw(2000);  // 取款
            account.Withdraw(500);

            Console.Read();

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