工廠模式也用了不少，特別是MS的petshop中對數據庫的訪問，通過工廠模式可以達到自由切換SQL 和 Oracle 數據庫。近來也在看設計模式的書，發現工廠模式還是有不少的擴展。結合書中的知識和我自己理解，從代碼的角度來比較工廠模式各變種。

1：簡單工廠模式：其作用是實例化對象而不需要客戶了解這個對象屬于那個具體的子類 。
using?System;
using?System.Collections;

public?class?MyClass
{
????public?static?void?Main()
????{
????????//通過參數來實例化子類。
????????IVehicle?vehicle?=?FactoryVehicle.CreateVehicle("car");
????????vehicle.go();
????????Console.ReadLine();????
????}
????
}

public?class?FactoryVehicle
{
????public?static?IVehicle?CreateVehicle(string?VehicleName)
????{
????????switch(VehicleName.ToLower())
????????{
????????????case?"car":
????????????return?new?Car();
????????????case?"boat":
????????????return?new?Boat();
????????????default:
????????????return?new?Car();
????????????
????????}
????}

}
public?interface?IVehicle
{
????void?go();
}
public?class?Car:IVehicle
{
????public?void?go()
????{
????????Console.WriteLine("car");
????}
}
public?class?Boat:IVehicle
{
????public?void?go()
????{
????????Console.WriteLine("boat");
????}
}
2:抽象工廠：即將工廠方法也抽象出來，由具體的子類來實例化工廠。產品創建部分和簡單工廠模式相同。
using?System;
using?System.Collections;

public?class?MyClass
{
????public?static?void?Main()
????{
????????//通過定義的工廠來實例化。弊端是當產品很多時需要增加很多的工廠。代碼重復。
????????FactoryVehicle?factory?=?new?FactoryCar();
????????IVehicle?vehicle?=?factory.CreateVehicle();
????????vehicle.go();
????????Console.ReadLine();????
????}
????
}


public?interface?FactoryVehicle
{
?????IVehicle?CreateVehicle();

}

public?class?FactoryCar:FactoryVehicle
{
????public?IVehicle?CreateVehicle()
????{
????????return?new?Car();
????}
}

public?class?FactoryBoat:FactoryVehicle
{
????public?IVehicle?CreateVehicle()
????{
????????return?new?Boat();
????}
}

public?interface?IVehicle
{
????void?go();
}

public?class?Car:IVehicle
{
????public?void?go()
????{
????????Console.WriteLine("car");
????}
}

public?class?Boat:IVehicle
{
????public?void?go()
????{
????????Console.WriteLine("boat");
????}
} 3:反射工廠模式： 其實就是通過反射的方式來獲得具體實例化是那個類。
using?System;
using?System.Collections;
using?System.Reflection;

public?class?MyClass
{
????public?static?void?Main()
????{
????????//使用反射的方法獲得實例化的類
????????IVehicle?vechicle?=?ReflectFactory.CreateVehicleByReflect("Car");
????????vechicle.go();
????????Console.ReadLine();????
????????
????}
????
}

public?class?ReflectFactory
{
????public?static?IVehicle?CreateVehicleByReflect(string?typeName)
????{
????????Type?type?=?Type.GetType(typeName);
????????ConstructorInfo??ci?=?type.GetConstructor(System.Type.EmptyTypes);;
????????return?(IVehicle)ci.Invoke(null);
????}
}
public?class?FactoryBoat:FactoryVehicle
{
????public?IVehicle?CreateVehicle()
????{
????????return?new?Boat();
????}
}

public?class?FactoryCar:FactoryVehicle
{
????public?IVehicle?CreateVehicle()
????{
????????return?new?Car();
????}
}

public?interface?FactoryVehicle
{
????IVehicle?CreateVehicle();

}
public?interface?IVehicle
{
????void?go();
}

public?class?Car:IVehicle
{
????public?void?go()
????{
????????Console.WriteLine("car");
????}
}

public?class?Boat:IVehicle
{
????public?void?go()
????{
????????Console.WriteLine("boat");
????}
}

總結

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