profile.save();

ExtendedProfileextendedprofile=newExtendedProfile();
message.InnerHtml+="<u>ExtendedProfileClass</u></br>";
message.InnerHtml+="Firstname:"+profile.getFirstname()+"<br>";
message.InnerHtml+="Lastname:"+profile.getLastname()+"<br>";
message.InnerHtml+="Phone:"+extendedprofile.getPhonenumber()+"<br>";
message.InnerHtml+="Address1:"+extendedprofile.getAddress1()+"<br>";
message.InnerHtml+="Address2:"+extendedprofile.getAddress2()+"<br>";
message.InnerHtml+="City:"+extendedprofile.getCity()+"<br>";
message.InnerHtml+="State:"+extendedprofile.getState()+"<br>";
message.InnerHtml+="Postal:"+extendedprofile.getPostal()+"<br>";
message.InnerHtml+="Description:"+extendedprofile.getDescription()+"<br>";

extendedprofile.save();
}
</script>
<metahttp-equiv="Content-Type"content="text/html;charset=gb2312">
<title></title>
</head>
<bodystyle="font:Arial,Helvetica,sans-serif">
<b><h3>简单的继承、多态例子</h3></b><br><br>
objectoutput:<br>
<br>
<divid="message"runat="server"/>
</body>
</html>
 

profile2.cs  类定义文件
usingSystem;
usingSystem.IO;
usingSystem.Xml;
namespaceshai//名称空间shai
{
interfaceISaveData//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
voidsave();
}

publicclassProfile:ISaveData//定义类Profile
{
protectedstring_firstname;//里面包含三个属性，分别为_firstname、_lastname、phonenumber
protectedstring_lastname;
protectedstring_phonenumber;

publicProfile()//为属性定义其中的初始值
{
_firstname="Saidy";
_lastname="Chen";
_phonenumber="(010)88716990";
}

publicstringgetPhonenumber()//Profile类中的方法getPhonenumber()
{
return_phonenumber;
}
publicvirtualvoidsetPhonenumber(stringphonenumber)
{
_phonenumber=phonenumber;
}

publicstringgetFirstname()//Profile类中的方法getFirstname()
{
return_firstname;
}
publicvoidsetFirstname(stringfirstname)
{
_firstname=firstname;
}

publicstringgetLastname()//Profile类中的方法getLastname()
{
return_lastname;
}
publicvoidsetLastname(stringlastname)
{
_lastname=lastname;
}

publicvirtualvoidsave()//调用ISaveData接口的save()方法
{
//保存数据为Text格式
FileStreamfs=newFileStream("D:\\myweb2\\profile2.txt",FileMode.Create,FileAccess.Write);
StreamWritersw=newStreamWriter(fs);
sw.WriteLine("Firstname:"+_firstname.ToString());
sw.WriteLine("Lastname:"+_lastname.ToString());
sw.WriteLine("Phone:"+_phonenumber.ToString());
sw.Flush();
sw.Close();
fs.Close();
}
}

publicclassExtendedProfile:Profile建立Profile子类ExtendedProfile，他可以继承Profile中的方法
{
protectedstring_address1;//子类ExtendedProfile的属性
protectedstring_address2;
protectedstring_city;
protectedstring_state;
protectedstring_postal;
protectedstring_description;

publicExtendedProfile()//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";
}

publicoverridevoidsetPhonenumber(stringphonenumber)//继承类Profile中的setPhonenumber()方法
{//setPhonenumber()方法的重载
_phonenumber=phonenumber;
}

publicstringgetAddress1()//子类ExtendedProfile中的方法getAddress1()，以下类推
{
return_address1;
}
publicstringgetAddress2()
{
return_address2;
}
publicvoidsetAddress(stringaddress1,stringaddress2)
{
_address1=address1;
_address2=address2;
}

publicstringgetCity()
{
return_city;
}
publicvoidsetCity(stringcity)
{
_city=city;
}

publicstringgetState()
{
return_state;
}
publicvoidsetState(stringstate)
{
_state=state;
}

publicstringgetPostal()
{
return_postal;
}
publicvoidsetPostal(stringpostal)
{
_postal=postal;
}

publicstringgetDescription()
{
return_description;
}
publicvoidsetDescription(stringdescription)
{
_description=description;
}

publicoverridevoidsave()//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";
XmlTextWriterwriter=null;//保存为一个Xml文件
try
{
writer=newXmlTextWriter(_document,null);
writer.Formatting=Formatting.Indented;
writer.WriteStartDocument(false);
writer.WriteDocType("Profile",null,null,null);//表示<!DOCTYPEProfile>
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(Exceptionee)
{
Console.WriteLine("Exception:{0}",ee.ToString());
}
}
}
}