给Asp.Net初学者的关于继承和多态性的例子(2)

2024-07-10 13:11:11

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    public class extendedprofile:profile 建立profile子类extendedprofile，他可以继承profile中的方法
   {
   protected string _address1; //子类extendedprofile的属性
   protected string _address2;
   protected string _city;
   protected string _state;
   protected string _postal;
   protected string _description;

   public extendedprofile() //子类extendedprofile中属性的初始值
   {
   _address1 = "清华大学";
   _address2 = "清华大学物理实验室";
   _city = "北京";
   _state = "北京";
   _postal = "100024";
   _description = "教授";
   }

   public override void setphonenumber(string phonenumber) //继承类profile中的setphonenumber()方法
   { //setphonenumber()方法的重载
   _phonenumber = phonenumber;
   }

   public string getaddress1() //子类extendedprofile中的方法getaddress1()，以下类推
   {
   return _address1;
   }
   public string getaddress2()
   {
   return _address2;
   }
   public void setaddress(string address1,string address2)
   {
   _address1 = address1;
   _address2 = address2;
   }

   public string getcity()
   {
   return _city;
   }
   public void setcity(string city)
   {
   _city = city;
   }

   public string getstate()
   {
   return _state;
   }
   public void setstate(string state)
   {
   _state = state;
   }

   public string getpostal()
   {
   return _postal;
   }
   public void setpostal(string postal)
   {
   _postal = postal;
   }

   public string getdescription()
   {
   return _description;
   }
   public void setdescription(string description)
   {
   _description = description;
   }

   public override void save() //调用接口isavedata()中的方法save()，save()方法的重载，由于多态性
   { //子类extendedprofile可以自定义并修改save()方法
   string _document = "d://myweb2//saidy.xml";
   xmltextwriter writer = null; //保存为一个xml文件
   try
   {
   writer = new xmltextwriter(_document,null);
   writer.formatting = formatting.indented;
   writer.writestartdocument(false);
   writer.writedoctype("profile",null,null,null); //表示<!doctype profile>
   writer.writestartelement("profile"); //生成根元素
   writer.writeelementstring("firstname",_firstname); //生成子元素 <firstname>_firstname</firstname>
   writer.writeelementstring("lastname",_lastname);
   writer.writeelementstring("phonenumber",_phonenumber);
   writer.writeelementstring("address1",_address1);
   writer.writeelementstring("address2",_address2);
   writer.writeelementstring("city",_city);
   writer.writeelementstring("state",_state);
   writer.writeelementstring("postal",_postal);
   writer.writeendelement();
   writer.flush();
   writer.close();
   }
   catch(exception ee)
   {
   console.writeline("exception:{0}",ee.tostring());
   }
   }
  }
  }

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