设计模式之C#实现(一)--AbstractFactory[6]

              public string showother(iabstractproducta a){

                     return a.tostring();

              }

       }

       public class productb2 : iabstractproductb{

              public string showself(){

                     return this.tostring();

              }

              public string showother(iabstractproducta a){

                     return a.tostring();