经过三周课设学到不少东西,,今天是放假第一天,看了大话设计模式两章,,记录一下.. 免得白看了
简单工厂模式
namespace 简单工厂模式
{
public class Operation
{
private double _numberA = 0;
private double _numberB = 0;
public double NumberB
{
get { return _numberB; }
set { _numberB = value; }
}
public double NumberA
{
get { return _numberA; }
set { _numberA = value; }
}
public virtual double GetResult()
{
double result = 0;
return result;
}
}
class OperatinAdd : Operation //加法
{
public override double GetResult() //重写GetResult方法
{
double result = 0;
result = NumberA + NumberB;
return result;
}
}
class OperatinSub : Operation //减法
{
public override double GetResult() //重写GetResult方法
{
double result = 0;
result = NumberA - NumberB;
return result;
}
}
class OperatinMul : Operation //乘法
{
public override double GetResult() //重写GetResult方法
{
double result = 0;
result = NumberA * NumberB;
return result;
}
}
class OperatinDiv : Operation //除法
{
public override double GetResult() //重写GetResult方法
{ double result = 0;
if (NumberB == 0)
throw new Exception("除数不能为0");
result = NumberA / NumberB;
return result;
}
}
public class operationFactory//选择符号类
{
public static Operation createOperate(string operate)
//实例化一个model类型,返回一个结果(结果是operation类型)通过符号类选择实例化的算法类
{
Operation oper = null;
switch (operate)//选择符号
{//通过选择符号对算法类进行实例化
case "+":
oper = new OperatinAdd();
break;
case "-":
oper = new OperatinSub();
break;
case "*":
oper = new OperatinMul();
break;
case "/":
oper = new OperatinDiv();
break;
}
return oper;
}
}
class Program
{
static void Main(string[] args)
{
Operation oper;
oper = operationFactory.createOperate("+");
oper.NumberA=100;
oper.NumberB = 100;
double result = oper.GetResult();
Console.Write(result);
}
}
}
//一个实体类(含一个虚方法,用于被覆盖)
// 数个方法类(操作实体)(继承实例类,并含一个方法覆盖虚方法)
//一个选择方法类(含一个静态方法,,可选择操作数个方法)
//用户操作类 实例化实体类,实例化选择方法类
//简单工厂模式和三层架构类似 (简单工厂模式利用虚方法的覆盖实现被多个类覆盖)
namespace 策略模式
{
public class Operation
{
private double _numberA = 0;
private double _numberB = 0;
public double NumberB
{
get { return _numberB; }
set { _numberB = value; }
}
public double NumberA
{
get { return _numberA; }
set { _numberA = value; }
}
public virtual double GetResult()
{
double result = 0;
return result;
}
}
class OperatinAdd : Operation //加法
{
public override double GetResult() //重写GetResult方法
{
double result = 0;
result = NumberA + NumberB;
return result;
}
}
class OperatinSub : Operation //减法
{
public override double GetResult() //重写GetResult方法
{
double result = 0;
result = NumberA - NumberB;
return result;
}
}
class OperatinMul : Operation //乘法
{
public override double GetResult() //重写GetResult方法
{
double result = 0;
result = NumberA * NumberB;
return result;
}
}
class OperatinDiv : Operation //除法
{
public override double GetResult() //重写GetResult方法
{
double result = 0;
if (NumberB == 0)
throw new Exception("除数不能为0");
result = NumberA / NumberB;
return result;
}
}
class cashcontext //策略模式封装方法
{
Operation oner;
public cashcontext(string type)
{
switch(type)//分支中实例化类
{case "+" :
OperatinAdd oo = new OperatinAdd();
oner = oo;
oner.NumberA = 100;
oner.NumberB = 100;
break;
case "-":
OperatinSub o1 = new OperatinSub();
oner = o1;
oner.NumberA = 100;
oner.NumberB = 100;
break;
case "*":
OperatinMul o2 = new OperatinMul();
oner = o2;
oner.NumberA = 100;
oner.NumberB = 100;
break;
case "/" :
OperatinDiv o3 = new OperatinDiv();
oner = o3;
oner.NumberA = 700;
oner.NumberB = 100;
break;
}
}
public double result()
{
return oner.GetResult();//调用相同方法
}
}
class Program
{
static void Main(string[] args)
{
cashcontext csah = new cashcontext("/");
double ss = csah.result();
Console.Write(ss);
}
}}
策略模式是一种定义一系列算法的方法,从概念上来看所有算法完成相同工作,只是实现不同,都是以相同方式调用所有算法.