设计商场收银软件 根据客户需求购买的单价和数量，计算总额
商场需求：打折和满减
简单工厂弄湿每次维护或扩展收费都要改动这个工厂，以至于代码需要重新编译部署
引入策略模式：定义算法家族，分别封装起来，让他们之间可以互相替换，此模式让算法的变化，不会影响到使用算法的客户
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace 策略模式
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
abstract class CashSuper
{
public abstract double acceptCash(double money);
}
class CashNormal : CashSuper
{
public override double acceptCash(double money) { return money; }
}
class CashRebate : CashSuper
{
private double moneyRebate = 1d;
public CashRebate(string moneyRebate)
{
this.moneyRebate = double.Parse(moneyRebate);
}
public override double acceptCash(double money)
{
return money * moneyRebate;
}
}
class CashReturn : CashSuper
{
private double moneyCondition = 0.0d;
private double moneyReturn = 0.0d;
public CashReturn(string moneyCondition, string moneyReturn)
{
this.moneyCondition = double.Parse(moneyCondition);
this.moneyReturn = double.Parse(moneyReturn);
}
public override double acceptCash(double money)
{
double result = money;
if (money >= moneyCondition)
result = money - Math.Floor(money / moneyCondition) * moneyReturn;
return result;
}
}
class CashContext
{
private CashSuper cs;
public CashContext(CashSuper csuper)
{
this.cs = csuper;
}
public double GetResult(double money)
{
return cs.acceptCash(money);
}
}
double total = 0.0d;
private void button1_Click(object sender, EventArgs e)
{
CashContext cc = null;
switch(listBox1.SelectedItem.ToString())
{
case "正常收费":
cc=new CashContext(new CashNormal());
break;
case "打8折":
cc=new CashContext(new CashRebate("0.8"));
break;
case "满300反100":
cc=new CashContext(new CashReturn("300","100"));
break;
}
double totalPrices=0d;
totalPrices=cc.GetResult(Convert.ToDouble(textBox1.Text)*Convert.ToDouble(textBox2.Text));
total=total+totalPrices;
label5.Text=total.ToString();
}
}
}策略+简单工厂
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace 策略模式
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
abstract class CashSuper
{
public abstract double acceptCash(double money);
}
class CashNormal : CashSuper
{
public override double acceptCash(double money) { return money; }
}
class CashRebate : CashSuper
{
private double moneyRebate = 1d;
public CashRebate(string moneyRebate)
{
this.moneyRebate = double.Parse(moneyRebate);
}
public override double acceptCash(double money)
{
return money * moneyRebate;
}
}
class CashReturn : CashSuper
{
private double moneyCondition = 0.0d;
private double moneyReturn = 0.0d;
public CashReturn(string moneyCondition, string moneyReturn)
{
this.moneyCondition = double.Parse(moneyCondition);
this.moneyReturn = double.Parse(moneyReturn);
}
public override double acceptCash(double money)
{
double result = money;
if (money >= moneyCondition)
result = money - Math.Floor(money / moneyCondition) * moneyReturn;
return result;
}
}
class CashContext
{
CashSuper cs=null;
public CashContext(string type)
{
switch (type)
{
case "正常收费":
CashNormal cs0 = new CashNormal();
cs = cs0;
break;
case "打8折":
CashRebate cs1 = new CashRebate("0.8");
cs = cs1;
break;
case "满300反100":
CashReturn cs2 = new CashReturn("300", "100");
cs = cs2;
break;
}
}
public double GetResult(double money)
{
return cs.acceptCash(money);
}
}
double total = 0.0d;
private void button1_Click(object sender, EventArgs e)
{
CashContext csuper = new CashContext(listBox1.SelectedItem.ToString());
double totalPrices=0d;
totalPrices=csuper.GetResult(Convert.ToDouble(textBox1.Text)*Convert.ToDouble(textBox2.Text));
total=total+totalPrices;
label5.Text=total.ToString();
}
}
}利用反射机制
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Reflection;
namespace 商场管理软件
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
DataSet ds;//用于存放配置文件信息
double total = 0.0d;//用于总计
private void Form1_Load(object sender, EventArgs e)
{
//读配置文件
ds = new DataSet();
ds.ReadXml(Application.StartupPath + "\\CashAcceptType.xml");
//将读取到的记录绑定到下拉列表框中
foreach (DataRowView dr in ds.Tables[0].DefaultView)
{
cbxType.Items.Add(dr["name"].ToString());
}
cbxType.SelectedIndex = 0;
}
private void btnOk_Click(object sender, EventArgs e)
{
CashContext cc = new CashContext();
//根据用户的选项，查询用户选择项的相关行
DataRow dr = ((DataRow[])ds.Tables[0].Select("name='" + cbxType.SelectedItem.ToString()+"'"))[0];
//声明一个参数的对象数组
object[] args =null;
//若有参数，则将其分割成字符串数组，用于实例化时所用的参数
if (dr["para"].ToString() != "")
args = dr["para"].ToString().Split(',');
//通过反射实例化出相应的算法对象
cc.setBehavior((CashSuper)Assembly.Load("商场管理软件").CreateInstance("商场管理软件." + dr["class"].ToString(), false, BindingFlags.Default, null, args, null, null));
double totalPrices = 0d;
totalPrices = cc.GetResult(Convert.ToDouble(txtPrice.Text) * Convert.ToDouble(txtNum.Text));
total = total + totalPrices;
lbxList.Items.Add("单价：" + txtPrice.Text + " 数量：" + txtNum.Text + " "+cbxType.SelectedItem+ " 合计：" + totalPrices.ToString());
lblResult.Text = total.ToString();
}
private void btnClear_Click(object sender, EventArgs e)
{
total = 0d;
txtPrice.Text = "0.00";
txtNum.Text = "1";
lbxList.Items.Clear();
lblResult.Text = "0.00";
}
}
}上面是书上的例子，昨天被对象问住了，发现自己学的不扎实啊T^T 对象举了cf acm比赛输出榜单的例子让我写
这个是单例模式的写法
class Program
{
abstract class contestSuper
{
public abstract string print(double number);
}
class cf: contestSuper
{
public override string print(double number)
{
return "cfboard"+" 人数："+number.ToString();
}
}
class acm: contestSuper
{
public override string print(double number)
{
return "acmbroad" + " 人数：" + number.ToString();
}
}
class showBoard
{
public static contestSuper createBoard(string type)
{
contestSuper cs=null;
switch(type)
{
case "cf":
cs = new cf();
break;
case "acm":
cs = new acm();
break;
}
return cs;
}
}
static void Main(string[] args)
{
contestSuper cs = showBoard.createBoard("cf");
string text = "";
text = cs.print(30);
Console.WriteLine(text);
cs = showBoard.createBoard("acm");
text = cs.print(30);
Console.WriteLine(text);
Console.Read();
}
}策略模式
abstract class contestSuper
{
public abstract string print(double number);
}
class cf : contestSuper
{
public override string print(double number)
{
return "cfboard" + " 人数：" + number.ToString();
}
}
class acm : contestSuper
{
public override string print(double number)
{
return "acmbroad" + " 人数：" + number.ToString();
}
}
class printContext
{
private contestSuper cs;
public printContext(contestSuper cs)
{
this.cs = cs;
}
public string createBoard(double number)
{
return cs.print(number);
}
}
static void Main(string[] args)
{
printContext pc = null;
string text = "acm";
switch (text)
{
case "acm":
pc = new printContext(new acm());
break;
case "cf":
pc = new printContext(new cf());
break;
}
text = pc.createBoard(30);
Console.WriteLine(text);
Console.Read();
}简单工厂+策略模式
class Program
{
abstract class contestSuper
{
public abstract string print(double number);
}
class cf : contestSuper
{
public override string print(double number)
{
return "cfboard" + " 人数：" + number.ToString();
}
}
class acm : contestSuper
{
public override string print(double number)
{
return "acmbroad" + " 人数：" + number.ToString();
}
}
class showBoard
{
contestSuper cs = null;
public showBoard(string type)
{
switch (type)
{
case "acm":
acm sb0 = new acm();
cs = sb0;
break;
case "cf":
cf sb1 = new cf();
cs = sb1;
break;
}
}
public string createBoard(double number)
{
return cs.print(number);
}
}
static void Main(string[] args)
{
showBoard sb = new showBoard("acm");
Console.WriteLine(sb.createBoard(30));
Console.Read();
}
}
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