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本人学Asp.Net不久,用的是C#写代码,在学习C#中发现很多初学者对继承和多态性不是特别的了解,因此作了这个例子,希望对您有所帮助,例子很简单
页面文件Te***rofileClass2.aspx
<%@ Page Language="C#" ContentType="text/html" ResponseEncoding="gb2312" Src="pr***le2.cs" %>
<%@ Import Namespace="shai" %>
类定义文件pr***le2.cs
using System;
using Sy***m.IO;
using Sy***m.Xml;
namespace shai //名称空间shai
{
interface ISaveData //定义一个接口ISaveData,他作为Profile的基类被继承,由于其有多态性的特点,可以被
{ //不同类调用其中的方法,并修改
void save();
}
public class Profile:ISaveData //定义类Profile
{
protected string _firstname; //里面包含三个属性,分别为_firstname、_lastname、phonenumber
protected string _lastname;
protected string _phonenumber;
public Profile() //为属性定义其中的初始值
{
_firstname = "Saidy";
_lastname = "Chen";
_phonenumber = "(010)88716990";
}
public string getPhonenumber() //Profile类中的方法getPhonenumber()
{
return _phonenumber;
}
public virtual void setPhonenumber(string phonenumber)
{
_phonenumber = phonenumber;
}
public string getFirstname() //Profile类中的方法getFirstname()
{
return _firstname;
}
public void setFirstname(string firstname)
{
_firstname = firstname;
}
public string getLastname() //Profile类中的方法getLastname()
{
return _lastname;
}
public void setLastname(string lastname)
{
_lastname = lastname;
}
public virtual void save() //调用ISaveData接口的save()方法
{
//保存数据为Text格式
FileStream fs = new FileStream("D:\myweb2\pr***le2.txt",Fi***ode.Create,Fi***ccess.Write);
StreamWriter sw = new StreamWriter(fs);
sw***iteLine("Firstname:"+_f***tname.ToString());
sw***iteLine("Lastname:"+_l***name.ToString());
sw***iteLine("Phone:"+_p***enumber.ToString());
sw.Flush();
sw.Close();
fs.Close();
}
}
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\sa***.xml";
XmlTextWriter writer = null; //保存为一个Xml文件
try
{
writer = new XmlTextWriter(_document,null);
wr***r.Formatting = Fo***tting.Indented;
wr***r.WriteStartDocument(false);
wr***r.WriteDocType("Profile",null,null,null); //表示
wr***r.WriteStartElement("Profile"); //生成根元素
wr***r.WriteElementString("firstname",_firstname); //生成子元素
wr***r.WriteElementString("lastname",_lastname);
wr***r.WriteElementString("phonenumber",_phonenumber);
wr***r.WriteElementString("address1",_address1);
wr***r.WriteElementString("address2",_address2);
wr***r.WriteElementString("city",_city);
wr***r.WriteElementString("state",_state);
wr***r.WriteElementString("postal",_postal);
wr***r.WriteEndElement();
wr***r.Flush();
wr***r.Close();
}
catch(Exception ee)
{
Co***le.WriteLine("Exception:{0}",ee***String());
}
}
}
}