精通ASP.NET（基于VB.NET)(四）VB.NET继承

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。