精通ASP.NET(基于VB.NET)(四)VB.NET继承

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                              精通ASP.NET(基于VB.NET)(四)VB.NET继承
                
 (1) 理解继承:继承是实现相关类方法、接口等共享的一种手段。相关类是指类及其派生类。基于不同类实例的独特性,故引入了public、private、protected作用域和overrides(重写)、方法重载overloads。这样作的目的:提高代码的复用性。
                 (2)继承的种类:实现继承、接口继承和可视继承。
                 (3)接口:先看一例
                            Interface Inter_comm
                                      sub read_x(by vlue x as integer)
                                      Function write_x(by vlue x as integer) as long
                                      Property pr_x() as string
                             end interface
                             class Inter_comm_made
                                      Implements Inter_comm
                                       private x as string
                                       sub read_x(by vlue x as integer) Implements Inter_comm.read_x
                                       end sub
                                      Function write_x(byval
 x as integer) as long Implements Inter_comm.write_x
                                      end function
                                       Property pro_x() as string Implements Inter_comm.pr_x
                                       get
                                              return x
                                       end get
                                        set(byval value as string)
                                                 x=value
                                        end set
                                        end class
                        接口定义用Interface。实现用类或结构,用Implements指定。

                                
                         



                

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