给Asp.Net初学者的关于继承和多态性的例子(2)

王朝asp·作者佚名  2006-11-24
窄屏简体版  字體: |||超大  

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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