设计模式之C#实现(一)--AbstractFactory[3]

       public interface iabstractproducta{

              string showself();

              string showother(iabstractproductb b);

       }

       public class producta1 : iabstractproducta{

              public producta1(){}

              public string showself(){

                     return this.tostring();

              }

              public string showother(iabstractproductb b){