C#入门（三）—面向对象思想

1、面向对象三大特性：封装、继承、多态；四大好处：可维护、可复用、可扩展、灵活性好。

2、业务的封装：高内聚、低耦合。

3、赋值！=复用。

4、简单设计模式之工厂模式：类的泛化

1 public class OperationFactory
2     {
3         public static Operation createOperate( string operate)
4         {
5             Operation oper = null ;
6             switch (operate)
7             {
8                 case " + " :
9                     {
10                         oper = new OperationAdd();
11                         break ;
12                     }
13                 case " - " :
14                     {
15                         oper = new OperationSub();
16                         break ;
17                     }
18                 case " * " :
19                     {
20                         oper = new OperationMul();
21                         break ;
22                     }
23                 case " / " :
24                     {
25                         oper = new OperationDiv();
26                         break ;
27                     }
28              }
29             return oper;
30         }
31     }

5、反射Using System.Reflection

    Animal animal = (Animal)Assembly.Load("AnimalSystem").CreateInstance("AnimalSystem.Cat");