标签：draw com limit 红色 dep status value change val
同一个对象，内部属性不同的时候，具备的状态也不同
例子为银行的存款，默认申请的都是银卡，如果金额小于0并且在银行可容忍的状态内的话，为红色状态，如果数量很大，那么为金卡状态，否则为超大金额（这里暂时不论这个，其实都是一样的，只不过多加一个类而已）
红卡每次取钱需要服务费（这个也没什么用）
(各个状态之间通过属性限制,可以自由的进行切换，原理就是在内部进行各自的判别，达到一定数量的时候，切换到需要的实例上去)（通过账户类默认一个实例进入到状态列表中，自动实现各个状态动态切换选择）
多个状态切换的时候， 应用每个状态的内部状态类，完成类字段属性的传递！
//抽象状态类 abstract class State { protected Account account; protected double balance;//总金额 public double Balance { get { return balance; } set { balance = value; } } public Account Account { get { return account; } set{ account = value; } } protected double interest;//利率 protected double lowerLimit;//最小限制 protected double upperLimit;//最大限制 public abstract void Deposit(double amount);//存钱 public abstract void Withdraw(double amount);//取钱 public abstract void PayInterest();//支付利息 }
//具体状态类别 //红色状态卡 class RedState : State { double serviceFee;//服务费 public RedState(State state) { this.account = state.Account; this.Balance = state.Balance; Initialize(); } public void Initialize()//默认 { // Should come from a datasource interest = 0.0; lowerLimit = -100.0; upperLimit = 0.0; serviceFee = 15.00; } public override void Deposit(double amount) { Balance += amount;
StateChangeCheck(); } public override void PayInterest() { //红卡表示在可容忍的情况下，欠费，无利息 } public override void Withdraw(double amount) { amount = amount - serviceFee; Console.WriteLine("No funds available for withdrawal!"); } private void StateChangeCheck() { if (Balance > upperLimit) { account.State = new SilverState(this); } } } class SilverState :State { public SilverState(State state):this(state.Balance,state.Account) { } public SilverState(double balance, Account account) { this.balance = balance; this.account = account; Initialize(); } private void Initialize() { // Should come from a datasource interest = 0.0; lowerLimit = 0.0; upperLimit = 1000.0; } 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 > upperLimit) { account.State = new GoldState(this); } else { account.State = new RedState(this); } } } class GoldState : State { public GoldState(State state):this(state.Balance, state.Account) { } public GoldState(double balance, Account account) { this.balance = balance; this.account = account; Initialize(); } private void Initialize() { // Should come from a database interest = 0.05; lowerLimit = 1000.0; upperLimit = 10000000.0; } 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 > upperLimit) { Console.WriteLine("金额太大了，需要开会讨论一下了"); } else { account.State = new SilverState(this); } } }
// 账户类 class Account { public State State { get; set; } private string owner; public double Balance { get {return State.Balance; } } public Account(string name) { this.owner = name; State = new SilverState(0.0, this);//默认就是银卡 } public void Deposit(double amount) { State.Deposit(amount); Console.WriteLine("Deposited {0:C} --- ", amount); Console.WriteLine(" Balance = {0:C}", this.Balance); Console.WriteLine(" Status = {0}\n", this.State.GetType().Name); Console.WriteLine(""); } public void Withdraw(double amount) { State.Withdraw(amount); Console.WriteLine("Withdrew {0:C} --- ", amount); Console.WriteLine(" Balance = {0:C}", this.Balance); Console.WriteLine(" Status = {0}\n", this.State.GetType().Name); } public void PayInterest() { State.PayInterest(); Console.WriteLine("Interest Paid --- "); Console.WriteLine(" Balance = {0:C}", this.Balance); Console.WriteLine(" Status = {0}\n", this.State.GetType().Name); } }
//实现 static void Main(string[] args) { // Open a new account Account account = new Account("Jim Johnson"); // Apply financial transactions account.Deposit(500.0); account.Deposit(300.0); account.Deposit(550.0); account.PayInterest(); account.Withdraw(2000.00); account.Withdraw(1100.00); // Wait for user Console.Read(); }
标签：draw com limit 红色 dep status value change val
原文地址：https://www.cnblogs.com/ningxinjie/p/12182225.html
