簡單工廠模式?
我之前做了個(gè)簡易計(jì)算器的簡單工廠模式,效果與你這個(gè)是一樣的~~~~
你的抽象類Shape里面的方法area（）和perimeter（）,可以參考的計(jì)算器的GetResult()
都是虛方法（使用virtual 關(guān)鍵字）,然后在計(jì)算面積、周長的子類中分別重寫（override關(guān)鍵字）就是了~~~~~~~~~

具體的你看我的簡易計(jì)算器工程模式 代碼：
C# 簡單工廠之簡易計(jì)算器
總共三個(gè)類：Operation.csOperationFactory.csProgram.cs
Operation.cs兩個(gè)操作數(shù),一個(gè)運(yùn)算的虛方法GetResult(),該方法得出運(yùn)算結(jié)果
加減乘除 四個(gè)運(yùn)算類,每個(gè)類繼承于Operation.cs,每個(gè)類都有一個(gè)GetResult()方法
,子類的GetResult()用于實(shí)現(xiàn)具體的加減乘除運(yùn)算~~~~~~~~
OperationFactory.cs實(shí)例化 加減乘除 四個(gè)運(yùn)算類~~~~~
Program.cs 里面是main（）調(diào)用運(yùn)算類~~~~~
Operation.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace FactoryPattern
{
///
/// 運(yùn)算類
///
public class Operation
{
#region 運(yùn)算類,包含兩個(gè)操作數(shù),一個(gè)虛的運(yùn)算方法
private double _numberA = 0;
///
/// 操作數(shù)A
///
public double NumberA
{
get { return _numberA; }
set { _numberA = value; }
}
private double _numberB = 0;
///
/// 操作數(shù)B
///
public double NumberB
{
get { return _numberB; }
set { _numberB = value; }
}
#region 虛方法,得到運(yùn)算結(jié)果
public virtual double GetResult()
{
double result = 0;
return result;
}
#endregion
#endregion
}
///
/// 加法類:繼承于運(yùn)算類
///
public class OperationAdd : Operation
{
public override double GetResult()
{
double result = 0;
result = NumberA + NumberB;
return result;
}
}
///
///減法類:繼承于運(yùn)算類
///
public class OperationSub : Operation
{
public override double GetResult()
{
double result = 0;
result = NumberA - NumberB;
return result;
}
}
///
/// 乘法類:繼承于運(yùn)算類
///
public class OperationMul : Operation
{
public override double GetResult()
{
double result = 0;
result = NumberA * NumberB;
return result;
}
}
///
/// 除法類:繼承于運(yùn)算類
///
public class OperationDiv : Operation
{
public override double GetResult()
{
double result = 0;
if (NumberB==0)
{
throw new Exception("除數(shù)不能為零!");

}
else
{
result = NumberA / NumberB;
return result;
}

}
}
#region 簡單工廠模式結(jié)論
/* 若要實(shí)現(xiàn)復(fù)雜的運(yùn)算,比如開根號、自然對數(shù)、求正余弦等等,
* 只需要：
* （1）增加相應(yīng)的運(yùn)算子類
* （2）在工廠的switch子句中添加相應(yīng)復(fù)雜運(yùn)算的分支
*就OK了
*/
#endregion
}
OperationFactory.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace FactoryPattern
{
public class OperationFactory
{
///
/// 根據(jù)相應(yīng)的運(yùn)算符號,工廠就實(shí)例化出合適的運(yùn)算對象
///
/// 加減乘除等運(yùn)算符號
///
public static Operation createOperation(string operationType)
{
Operation operation = null;
//分別實(shí)例化具體的 加減乘除 運(yùn)算類~~~~~~~~~
switch (operationType)
{
case "+":
operation = new OperationAdd();
break;
case "-":
operation = new OperationSub();
break;
case "*":
operation = new OperationMul();
break;
case "/" :
operation = new OperationDiv();
break;
default:
operation = new Operation();
break;
}
return operation;
}
}
}
Program.cs
調(diào)用~~~~~
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace FactoryPattern
{
class Program
{
static void Main(string[] args)
{
double result = 0;
string operationType = "+";
Operation oper = null;
// 【傳入運(yùn)算符,工廠實(shí)例化創(chuàng)造一個(gè)相應(yīng)的運(yùn)算對象】
oper = OperationFactory.createOperation(operationType);
oper.NumberA = 1;
oper.NumberB = 5;
// 【經(jīng)過多態(tài),返回父類的方式,實(shí)現(xiàn)計(jì)算結(jié)果】
result = oper.GetResult();
Console.WriteLine(result);
operationType = "-";
oper = OperationFactory.createOperation(operationType);
oper.NumberA = 1;
oper.NumberB = 5;
result = oper.GetResult();
Console.WriteLine(result);
operationType = "*";
oper = OperationFactory.createOperation(operationType);
oper.NumberA = 1;
oper.NumberB = 5;
result = oper.GetResult();
Console.WriteLine(result);
operationType = "/";
oper = OperationFactory.createOperation(operationType);
oper.NumberA = 1;
oper.NumberB = 5;
result = oper.GetResult();
Console.WriteLine(result);
Console.ReadKey();
}
}
}