精通ASP.NET（基于VB.NET)( 二）VB.NET类

           （1）类的定义
                   class class_name
                   
                   end class
             (2)类的成员
                  1.域：变量的申明区
                  2.属性：提供读（GET）、写（SET）的控制接口的数据块
                           private x as integer
                           pubilc property x()
                               get
                                return _x
                               end get
                               set
                               _x=value
                               end set
                            end property
                   3.子程序与函数（方法）：
                              子程序：
                                  public sub x_read()
                                  end sub
                               函数 :
                                  function x_write()
                                  end function
              (3)继承：public class class1_name 
                                                      inherits class2_name
                             end class       
              (4)重载： overloads sub x_read(x as char)
                              overloads sub x_read(x as integer)
                              overloads function  x_write(x as char)
                              overloads function  x_write(x as integer)

              (5)构造器：若未定义构造器(new方法），系统将自动创建。
            （6）notinheritable类：若类申明为notinheritable类，该类不能被继承。
                                         notinheritable class class_name
                                         end class
              (7)命名空间（namespace):提供类或一组类的寻址
                     namespace       space _name
                          public class class1
                          end class
                          public class class2
                          end class
                     end namespace
                  引用（定义类实例）：Private class_name As space_name.class1
                                                     Private class_name As space_name.class2
              (8)共享方法：
                          public class class1
                           shared function x_read(ByVal a As Integer, ByVal b As Integer)
                                  Return a + b
                           end function
                           end class
                            共享方法可不通过实例化对象而直接访问。
                                dim result as inetger
                                result=class1.x_read(10,20)
              (9)共享变量：
                      &n

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