原型
1:概述
原型模式的用意是:通过给出一个原型对象来指明所要创建的对象类型,然后用复制这个原型对象的办法创建出更多的同类型对象。
2:C#对原型模式的支持
在C#里面,我们可以很容易的通过Clone()方法实现原型模式。任何类,只要想支持克隆,必须实现C#中的ICloneable接口。ICloneable接口中有一Clone方法,可以在类中复写实现自定义的克隆方法。克隆的实现方法有两种:浅拷贝(shallow copy)与深拷贝(deep copy)。
浅拷贝:是指当对象的字段值被拷贝时,字段引用的对象不会被拷贝。例如,如果一个对象有一个指向字符串的字段,并且我们对该对象做了一个浅拷贝,那么两个对象将引用同一个字符串。
深拷贝:是对对象实例中字段引用的对象也进行拷贝的一种方式,所以如果一个对象有一个指向字符串的字段,并且我们对该对象做了一个深拷贝的话,我们将创建一个新的对象和一个新的字符串--新对象将引用新字符串。需要注意的是执行深拷贝后,原来的对象和新创建的对象不会共享任何东西;改变一个对象对另外一个对象没有任何影响。
3:类图
3:代码
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