设计模式之C#实现(一)--AbstractFactory[8]

       }

       public class concretefactory2 : iabstractfactory{

              public iabstractproducta createproducta(){

                     return new producta2();

              }

              public iabstractproductb createproductb(){

                     return new productb2();

              }

       }

       public class client{